好用的代码网站/百度seo优化价格

使用方法：查看文章目录，查找需要的功能。

1、禁止手机睡眠

[UIApplication sharedApplication].idleTimerDisabled = YES;

2、 隐藏某行cell

	- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{// 如果是你需要隐藏的那一行，返回高度为0if(indexPath.row == YouWantToHideRow)return 0; return 44;}// 然后再你需要隐藏cell的时候调用[self.tableView beginUpdates];[self.tableView endUpdates];

3、禁用button高亮

	button.adjustsImageWhenHighlighted = NO;//或者在创建的时候UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

4.、切换window的根控制器

// options是动画选项
[UIView transitionWithView:[UIApplication sharedApplication].keyWindow duration:0.5f options:UIViewAnimationOptionTransitionCrossDissolve animations:^{BOOL oldState = [UIView areAnimationsEnabled];[UIView setAnimationsEnabled:NO];[UIApplication sharedApplication].keyWindow.rootViewController = [RootViewController new];[UIView setAnimationsEnabled:oldState];} completion:^(BOOL finished) {}];

5、去除数组中重复的对象

NSArray *newArr = [oldArr valueForKeyPath:@“@distinctUnionOfObjects.self"];

6、给一个view截图

UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0.0);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];UIImage *img = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();

7、collectionView的内容小于其宽高的时候是不能滚动的，设置可以滚动：

collectionView.alwaysBounceHorizontal = YES;
collectionView.alwaysBounceVertical = YES;

8、设置navigationBar上的title颜色和大小

    [self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor youColor], NSFontAttributeName : [UIFont systemFontOfSize:15]}]

9、颜色转图片

+ (UIImage *)cl_imageWithColor:(UIColor *)color {CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);UIGraphicsBeginImageContext(rect.size);CGContextRef context = UIGraphicsGetCurrentContext();CGContextSetFillColorWithColor(context, [color CGColor]);CGContextFillRect(context, rect);UIImage *image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return image;
}

10、view设置圆角

#define ViewBorderRadius(View, Radius, Width, Color)\
\
[View.layer setCornerRadius:(Radius)];\
[View.layer setMasksToBounds:YES];\
[View.layer setBorderWidth:(Width)];\
[View.layer setBorderColor:[Color CGColor]] // view圆角

11、强／弱引用

#define WeakSelf(type)  __weak typeof(type) weak##type = type; // weak
#define StrongSelf(type)  __strong typeof(type) type = weak##type; // strong

12、由角度转换弧度

#define DegreesToRadian(x) (M_PI * (x) / 180.0)

13、由弧度转换角度

#define RadianToDegrees(radian) (radian*180.0)/(M_PI)

14、获取图片资源

#define GetImage(imageName) [UIImage imageNamed:[NSString stringWithFormat:@"%@",imageName]]

15、获取temp

#define PathTemp NSTemporaryDirectory()

16、获取沙盒 Document

#define PathDocument [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]

17、获取沙盒 Cache

#define PathCache [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]

18、GCD代码只执行一次

#define kDISPATCH_ONCE_BLOCK(onceBlock) static dispatch_once_t onceToken; dispatch_once(&onceToken, onceBlock);

19、自定义NSLog

#ifdef DEBUG
#define NSLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)
#else
#define NSLog(...)
#endif

20、Font

#define FontL(s)             [UIFont systemFontOfSize:s weight:UIFontWeightLight]
#define FontR(s)             [UIFont systemFontOfSize:s weight:UIFontWeightRegular]
#define FontB(s)             [UIFont systemFontOfSize:s weight:UIFontWeightBold]
#define FontT(s)             [UIFont systemFontOfSize:s weight:UIFontWeightThin]
#define Font(s)              FontL(s)

21、FORMAT

#define FORMAT(f, ...)      [NSString stringWithFormat:f, ## __VA_ARGS__]

22、在主线程上运行

#define kDISPATCH_MAIN_THREAD(mainQueueBlock) dispatch_async(dispatch_get_main_queue(), mainQueueBlock);

23、开启异步线程

#define kDISPATCH_GLOBAL_QUEUE_DEFAULT(globalQueueBlock) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), globalQueueBlocl);

24、通知

#define NOTIF_ADD(n, f)     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(f) name:n object:nil]
#define NOTIF_POST(n, o)    [[NSNotificationCenter defaultCenter] postNotificationName:n object:o]
#define NOTIF_REMV()        [[NSNotificationCenter defaultCenter] removeObserver:self]

25、随机颜色

+ (UIColor *)RandomColor {NSInteger aRedValue = arc4random() % 255;NSInteger aGreenValue = arc4random() % 255;NSInteger aBlueValue = arc4random() % 255;UIColor *randColor = [UIColor colorWithRed:aRedValue / 255.0f green:aGreenValue / 255.0f blue:aBlueValue / 255.0f alpha:1.0f];return randColor;
}

26、获取window

+(UIWindow*)getWindow {UIWindow* win = nil; //[UIApplication sharedApplication].keyWindow;for (id item in [UIApplication sharedApplication].windows) {if ([item class] == [UIWindow class]) {if (!((UIWindow*)item).hidden) {win = item;break;}}}return win;
}

27、统一收起键盘

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

28、控制屏幕旋转，在控制器中写

/** 是否支持自动转屏 */
- (BOOL)shouldAutorotate {return YES;
}/** 支持哪些屏幕方向 */
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
}/** 默认的屏幕方向（当前ViewController必须是通过模态出来的UIViewController（模态带导航的无效）方式展现出来的，才会调用这个方法） */
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {return UIInterfaceOrientationLandscapeLeft | UIInterfaceOrientationLandscapeRight;
}

29、获取app缓存大小

- (CGFloat)getCachSize {NSUInteger imageCacheSize = [[SDImageCache sharedImageCache] getSize];//获取自定义缓存大小//用枚举器遍历 一个文件夹的内容//1.获取 文件夹枚举器NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];NSDirectoryEnumerator *enumerator = [[NSFileManager defaultManager] enumeratorAtPath:myCachePath];__block NSUInteger count = 0;//2.遍历for (NSString *fileName in enumerator) {NSString *path = [myCachePath stringByAppendingPathComponent:fileName];NSDictionary *fileDict = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];count += fileDict.fileSize;//自定义所有缓存大小}// 得到是字节  转化为MCGFloat totalSize = ((CGFloat)imageCacheSize+count)/1024/1024;return totalSize;
}

30、清理app缓存

- (void)handleClearView {//删除两部分//1.删除 sd 图片缓存//先清除内存中的图片缓存[[SDImageCache sharedImageCache] clearMemory];//清除磁盘的缓存[[SDImageCache sharedImageCache] clearDisk];//2.删除自己缓存NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];[[NSFileManager defaultManager] removeItemAtPath:myCachePath error:nil];
}

31、模型转字典

static NSSet *classes;- (NSMutableDictionary *)getParameterDictionary {NSMutableDictionary *dict = [NSMutableDictionary dictionary];Class c = self.class;while (c) {unsigned count;objc_property_t *properties = class_copyPropertyList([c class], &count);for (int i = 0; i < count; i++) {NSString *key = [NSString stringWithUTF8String:property_getName(properties[i])];dict[key] = [self valueForKey:key];}free(properties);// 获得父类c = class_getSuperclass(c);if ([self isClassFromFoundation:c]) break;}return dict;
}- (BOOL)isClassFromFoundation:(Class)c
{if (c == [NSObject class] || c == [NSManagedObject class]) return YES;__block BOOL result = NO;[[self foundationClasses] enumerateObjectsUsingBlock:^(Class foundationClass, BOOL *stop) {if ([c isSubclassOfClass:foundationClass]) {result = YES;*stop = YES;}}];return result;
}- (NSSet *)foundationClasses
{if (classes == nil) {// 集合中没有NSObject，因为几乎所有的类都是继承自NSObject，具体是不是NSObject需要特殊判断classes = [NSSet setWithObjects:[NSURL class],[NSDate class],[NSValue class],[NSData class],[NSError class],[NSArray class],[NSDictionary class],[NSString class],[NSAttributedString class], nil];}return classes;
}

32、交换两个方法实现

Class aClass = [self class]; SEL originalSelector = @selector(viewWillAppear:); SEL swizzledSelector = @selector(xxx_viewWillAppear:); Method originalMethod = class_getInstanceMethod(aClass, originalSelector); Method swizzledMethod = class_getInstanceMethod(aClass, swizzledSelector); BOOL didAddMethod = class_addMethod(aClass, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod)); if (didAddMethod) { class_replaceMethod(aClass, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod)); } else { method_exchangeImplementations(originalMethod, swizzledMethod); }

33、几个常用权限判断

    if ([CLLocationManager authorizationStatus] ==kCLAuthorizationStatusDenied) {NSLog(@"没有定位权限");}AVAuthorizationStatus statusVideo = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];if (statusVideo == AVAuthorizationStatusDenied) {NSLog(@"没有摄像头权限");}//是否有麦克风权限AVAuthorizationStatus statusAudio = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];if (statusAudio == AVAuthorizationStatusDenied) {NSLog(@"没有录音权限");}[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {if (status == PHAuthorizationStatusDenied) {NSLog(@"没有相册权限");}}];

34、长按复制功能

- (void)viewDidLoad
{[self.view addGestureRecognizer:[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(pasteBoard:)]];
}
- (void)pasteBoard:(UILongPressGestureRecognizer *)longPress {if (longPress.state == UIGestureRecognizerStateBegan) {UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];pasteboard.string = @"需要复制的文本";}
}

35、判断图片类型

//通过图片Data数据第一个字节 来获取图片扩展名
- (NSString *)contentTypeForImageData:(NSData *)data
{uint8_t c;[data getBytes:&c length:1];switch (c){case 0xFF:return @"jpeg";case 0x89:return @"png";case 0x47:return @"gif";case 0x49:case 0x4D:return @"tiff";case 0x52:if ([data length] < 12) {return nil;}NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding];if ([testString hasPrefix:@"RIFF"]&& [testString hasSuffix:@"WEBP"]){return @"webp";}return nil;}return nil;
}

36、获取手机和app信息

NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];  CFShow(infoDictionary);  
// app名称  NSString *app_Name = [infoDictionary objectForKey:@"CFBundleDisplayName"];  // app版本  NSString *app_Version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];  // app build版本  NSString *app_build = [infoDictionary objectForKey:@"CFBundleVersion"];  //手机序列号  NSString* identifierNumber = [[UIDevice currentDevice] uniqueIdentifier];  NSLog(@"手机序列号: %@",identifierNumber);  //手机别名： 用户定义的名称  NSString* userPhoneName = [[UIDevice currentDevice] name];  NSLog(@"手机别名: %@", userPhoneName);  //设备名称  NSString* deviceName = [[UIDevice currentDevice] systemName];  NSLog(@"设备名称: %@",deviceName );  //手机系统版本  NSString* phoneVersion = [[UIDevice currentDevice] systemVersion];  NSLog(@"手机系统版本: %@", phoneVersion);  //手机型号  NSString* phoneModel = [[UIDevice currentDevice] model];  NSLog(@"手机型号: %@",phoneModel );  //地方型号  （国际化区域名称）  NSString* localPhoneModel = [[UIDevice currentDevice] localizedModel];  NSLog(@"国际化区域名称: %@",localPhoneModel );  NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];  // 当前应用名称  NSString *appCurName = [infoDictionary objectForKey:@"CFBundleDisplayName"];  NSLog(@"当前应用名称：%@",appCurName);  // 当前应用软件版本  比如：1.0.1  NSString *appCurVersion = [infoDictionary objectForKey:@"CFBundleShortVersionString"];  NSLog(@"当前应用软件版本:%@",appCurVersion);  // 当前应用版本号码   int类型  NSString *appCurVersionNum = [infoDictionary objectForKey:@"CFBundleVersion"];  NSLog(@"当前应用版本号码：%@",appCurVersionNum);

37、获取一个类的所有属性

id LenderClass = objc_getClass("Lender");
unsigned int outCount, i;
objc_property_t *properties = class_copyPropertyList(LenderClass, &outCount);
for (i = 0; i < outCount; i++) {objc_property_t property = properties[i];fprintf(stdout, "%s %s\n", property_getName(property), property_getAttributes(property));
}

38、image圆角

- (UIImage *)circleImage
{// NO代表透明UIGraphicsBeginImageContextWithOptions(self.size, NO, 1);// 获得上下文CGContextRef ctx = UIGraphicsGetCurrentContext();// 添加一个圆CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);// 方形变圆形CGContextAddEllipseInRect(ctx, rect);// 裁剪CGContextClip(ctx);// 将图片画上去[self drawInRect:rect];UIImage *image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return image;
}

39、image拉伸

+ (UIImage *)resizableImage:(NSString *)imageName
{UIImage *image = [UIImage imageNamed:imageName];CGFloat imageW = image.size.width;CGFloat imageH = image.size.height;return [image resizableImageWithCapInsets:UIEdgeInsetsMake(imageH * 0.5, imageW * 0.5, imageH * 0.5, imageW * 0.5) resizingMode:UIImageResizingModeStretch];
}

40、JSON字符串转字典

+ (NSDictionary *)parseJSONStringToNSDictionary:(NSString *)JSONString {NSData *JSONData = [JSONString dataUsingEncoding:NSUTF8StringEncoding];NSDictionary *responseJSON = [NSJSONSerialization JSONObjectWithData:JSONData options:NSJSONReadingMutableLeaves error:nil];return responseJSON;
}

41、身份证号验证

- (BOOL)validateIdentityCard {BOOL flag;if (self.length <= 0) {flag = NO;return flag;}NSString *regex2 = @"^(\\d{14}|\\d{17})(\\d|[xX])$";NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];return [identityCardPredicate evaluateWithObject:self];
}

42、获取设备mac地址

+ (NSString *)macAddress {int                 mib[6];size_t              len;char                *buf;unsigned char       *ptr;struct if_msghdr    *ifm;struct sockaddr_dl  *sdl;mib[0] = CTL_NET;mib[1] = AF_ROUTE;mib[2] = 0;mib[3] = AF_LINK;mib[4] = NET_RT_IFLIST;if((mib[5] = if_nametoindex("en0")) == 0) {printf("Error: if_nametoindex error\n");return NULL;}if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {printf("Error: sysctl, take 1\n");return NULL;}if((buf = malloc(len)) == NULL) {printf("Could not allocate memory. Rrror!\n");return NULL;}if(sysctl(mib, 6, buf, &len, NULL, 0) < 0) {printf("Error: sysctl, take 2");return NULL;}ifm = (struct if_msghdr *)buf;sdl = (struct sockaddr_dl *)(ifm + 1);ptr = (unsigned char *)LLADDR(sdl);NSString *outstring = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X",*ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];free(buf);return outstring;
}

43、导入自定义字体库

1、找到你想用的字体的 ttf 格式，拖入工程
2、在工程的plist中增加一行数组，“Fonts provided by application”
3、为这个key添加一个item，value为你刚才导入的ttf文件名
4、直接使用即可：label.font = [UIFont fontWithName:@"你刚才导入的ttf文件名" size:20.0]；

44、拿到当前正在显示的控制器

- (UIViewController *)getVisibleViewControllerFrom:(UIViewController*)vc {if ([vc isKindOfClass:[UINavigationController class]]) {return [self getVisibleViewControllerFrom:[((UINavigationController*) vc) visibleViewController]];}else if ([vc isKindOfClass:[UITabBarController class]]){return [self getVisibleViewControllerFrom:[((UITabBarController*) vc) selectedViewController]];} else {if (vc.presentedViewController) {return [self getVisibleViewControllerFrom:vc.presentedViewController];} else {return vc;}}
}

45、runtime为一个类动态添加属性

// 动态添加属性的本质是: 让对象的某个属性与值产生关联
objc_setAssociatedObject(self, WZBPlaceholderViewKey, placeholderView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);

46、获取runtime为一个类动态添加的属性

objc_getAssociatedObject(self, WZBPlaceholderViewKey);

47、KVO监听某个对象的属性

// 添加监听者
[self addObserver:self forKeyPath:property options:NSKeyValueObservingOptionNew context:nil];// 当监听的属性值变化的时候会来到这个方法
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {if ([keyPath isEqualToString:@"property"]) {[self textViewTextChange];} else {}
}

48、Reachability判断网络状态

NetworkStatus status = [[Reachability reachabilityForInternetConnection] currentReachabilityStatus];if (status == NotReachable) {NSLog(@"当前设备无网络");}if (status == ReachableViaWiFi) {NSLog(@"当前wifi网络");}if (status == ReachableViaWWAN) {NSLog(@"当前蜂窝移动网络");} 

49、AFNetworking监听网络状态

// 监听网络状况AFNetworkReachabilityManager *mgr = [AFNetworkReachabilityManager sharedManager];[mgr setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {switch (status) {case AFNetworkReachabilityStatusUnknown:break;case AFNetworkReachabilityStatusNotReachable: {[SVProgressHUD showInfoWithStatus:@"当前设备无网络"];}break;case AFNetworkReachabilityStatusReachableViaWiFi:[SVProgressHUD showInfoWithStatus:@"当前Wi-Fi网络"];break;case AFNetworkReachabilityStatusReachableViaWWAN:[SVProgressHUD showInfoWithStatus:@"当前蜂窝移动网络"];break;default:break;}}];[mgr startMonitoring];

50、取图片某一点的颜色

    if (point.x < 0 || point.y < 0) return nil;CGImageRef imageRef = self.CGImage;NSUInteger width = CGImageGetWidth(imageRef);NSUInteger height = CGImageGetHeight(imageRef);if (point.x >= width || point.y >= height) return nil;unsigned char *rawData = malloc(height * width * 4);if (!rawData) return nil;CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();NSUInteger bytesPerPixel = 4;NSUInteger bytesPerRow = bytesPerPixel * width;NSUInteger bitsPerComponent = 8;CGContextRef context = CGBitmapContextCreate(rawData,width,height,bitsPerComponent,bytesPerRow,colorSpace,kCGImageAlphaPremultipliedLast| kCGBitmapByteOrder32Big);if (!context) {free(rawData);return nil;}CGColorSpaceRelease(colorSpace);CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);CGContextRelease(context);int byteIndex = (bytesPerRow * point.y) + point.x * bytesPerPixel;CGFloat red   = (rawData[byteIndex]     * 1.0) / 255.0;CGFloat green = (rawData[byteIndex + 1] * 1.0) / 255.0;CGFloat blue  = (rawData[byteIndex + 2] * 1.0) / 255.0;CGFloat alpha = (rawData[byteIndex + 3] * 1.0) / 255.0;UIColor *result = nil;result = [UIColor colorWithRed:red green:green blue:blue alpha:alpha];free(rawData);return result;

51、判断该图片是否有透明度通道

  - (BOOL)hasAlphaChannel
{CGImageAlphaInfo alpha = CGImageGetAlphaInfo(self.CGImage);return (alpha == kCGImageAlphaFirst ||alpha == kCGImageAlphaLast ||alpha == kCGImageAlphaPremultipliedFirst ||alpha == kCGImageAlphaPremultipliedLast);
}

52、获得灰度图

+ (UIImage*)covertToGrayImageFromImage:(UIImage*)sourceImage
{int width = sourceImage.size.width;int height = sourceImage.size.height;CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();CGContextRef context = CGBitmapContextCreate (nil,width,height,8,0,colorSpace,kCGImageAlphaNone);CGColorSpaceRelease(colorSpace);if (context == NULL) {return nil;}CGContextDrawImage(context,CGRectMake(0, 0, width, height), sourceImage.CGImage);CGImageRef contextRef = CGBitmapContextCreateImage(context);UIImage *grayImage = [UIImage imageWithCGImage:contextRef];CGContextRelease(context);CGImageRelease(contextRef);return grayImage;
}

53、根据bundle中的文件名读取图片

   + (UIImage *)imageWithFileName:(NSString *)name {NSString *extension = @"png";NSArray *components = [name componentsSeparatedByString:@"."];if ([components count] >= 2) {NSUInteger lastIndex = components.count - 1;extension = [components objectAtIndex:lastIndex];name = [name substringToIndex:(name.length-(extension.length+1))];}// 如果为Retina屏幕且存在对应图片，则返回Retina图片，否则查找普通图片if ([UIScreen mainScreen].scale == 2.0) {name = [name stringByAppendingString:@"@2x"];NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:extension];if (path != nil) {return [UIImage imageWithContentsOfFile:path];}}if ([UIScreen mainScreen].scale == 3.0) {name = [name stringByAppendingString:@"@3x"];NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:extension];if (path != nil) {return [UIImage imageWithContentsOfFile:path];}}NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:extension];if (path) {return [UIImage imageWithContentsOfFile:path];}return nil;
}

54、合并两个图片

+ (UIImage*)mergeImage:(UIImage*)firstImage withImage:(UIImage*)secondImage {CGImageRef firstImageRef = firstImage.CGImage;CGFloat firstWidth = CGImageGetWidth(firstImageRef);CGFloat firstHeight = CGImageGetHeight(firstImageRef);CGImageRef secondImageRef = secondImage.CGImage;CGFloat secondWidth = CGImageGetWidth(secondImageRef);CGFloat secondHeight = CGImageGetHeight(secondImageRef);CGSize mergedSize = CGSizeMake(MAX(firstWidth, secondWidth), MAX(firstHeight, secondHeight));UIGraphicsBeginImageContext(mergedSize);[firstImage drawInRect:CGRectMake(0, 0, firstWidth, firstHeight)];[secondImage drawInRect:CGRectMake(0, 0, secondWidth, secondHeight)];UIImage *image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return image;
}

55、为imageView添加倒影

    CGRect frame = self.frame;frame.origin.y += (frame.size.height + 1);UIImageView *reflectionImageView = [[UIImageView alloc] initWithFrame:frame];self.clipsToBounds = TRUE;reflectionImageView.contentMode = self.contentMode;[reflectionImageView setImage:self.image];reflectionImageView.transform = CGAffineTransformMakeScale(1.0, -1.0);CALayer *reflectionLayer = [reflectionImageView layer];CAGradientLayer *gradientLayer = [CAGradientLayer layer];gradientLayer.bounds = reflectionLayer.bounds;gradientLayer.position = CGPointMake(reflectionLayer.bounds.size.width / 2, reflectionLayer.bounds.size.height * 0.5);gradientLayer.colors = [NSArray arrayWithObjects:(id)[[UIColor clearColor] CGColor],(id)[[UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:0.3] CGColor], nil];gradientLayer.startPoint = CGPointMake(0.5,0.5);gradientLayer.endPoint = CGPointMake(0.5,1.0);reflectionLayer.mask = gradientLayer;[self.superview addSubview:reflectionImageView];

56、画水印

// 画水印
- (void) setImage:(UIImage *)image withWaterMark:(UIImage *)mark inRect:(CGRect)rect
{if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0){UIGraphicsBeginImageContextWithOptions(self.frame.size, NO, 0.0);}//原图[image drawInRect:self.bounds];//水印图[mark drawInRect:rect];UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();self.image = newPic;
}

57、让label的文字内容显示在左上／右上／左下／右下／中心顶／中心底部

//自定义UILabel
// 重写label的textRectForBounds方法
- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines {CGRect rect = [super textRectForBounds:bounds limitedToNumberOfLines:numberOfLines];switch (self.textAlignmentType) {case WZBTextAlignmentTypeLeftTop: {rect.origin = bounds.origin;}break;case WZBTextAlignmentTypeRightTop: {rect.origin = CGPointMake(CGRectGetMaxX(bounds) - rect.size.width, bounds.origin.y);}break;case WZBTextAlignmentTypeLeftBottom: {rect.origin = CGPointMake(bounds.origin.x, CGRectGetMaxY(bounds) - rect.size.height);}break;case WZBTextAlignmentTypeRightBottom: {rect.origin = CGPointMake(CGRectGetMaxX(bounds) - rect.size.width, CGRectGetMaxY(bounds) - rect.size.height);}break;case WZBTextAlignmentTypeTopCenter: {rect.origin = CGPointMake((CGRectGetWidth(bounds) - CGRectGetWidth(rect)) / 2, CGRectGetMaxY(bounds) - rect.origin.y);}break;case WZBTextAlignmentTypeBottomCenter: {rect.origin = CGPointMake((CGRectGetWidth(bounds) - CGRectGetWidth(rect)) / 2, CGRectGetMaxY(bounds) - CGRectGetMaxY(bounds) - rect.size.height);}break;case WZBTextAlignmentTypeLeft: {rect.origin = CGPointMake(0, rect.origin.y);}break;case WZBTextAlignmentTypeRight: {rect.origin = CGPointMake(rect.origin.x, 0);}break;case WZBTextAlignmentTypeCenter: {rect.origin = CGPointMake((CGRectGetWidth(bounds) - CGRectGetWidth(rect)) / 2, (CGRectGetHeight(bounds) - CGRectGetHeight(rect)) / 2);}break;default:break;}return rect;
}
- (void)drawTextInRect:(CGRect)rect {CGRect textRect = [self textRectForBounds:rect limitedToNumberOfLines:self.numberOfLines];[super drawTextInRect:textRect];
}

58、scrollView上的输入框，键盘挡住的问题

//推荐用IQKeyboardManager这个框架！
//手动解决如下
//1、监听键盘弹出／消失的通知
//2、在通知中加入代码：
NSDictionary* info = [aNotification userInfo];
CGRect keyPadFrame=[[UIApplication sharedApplication].keyWindow convertRect:[[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue] fromView:self.view];
CGSize kbSize =keyPadFrame.size;
CGRect activeRect=[self.view convertRect:activeField.frame fromView:activeField.superview];
CGRect aRect = self.view.bounds;
aRect.size.height -= (kbSize.height);CGPoint origin =  activeRect.origin;
origin.y -= backScrollView.contentOffset.y;
if (!CGRectContainsPoint(aRect, origin)) {CGPoint scrollPoint = CGPointMake(0.0,CGRectGetMaxY(activeRect)-(aRect.size.height));[backScrollView setContentOffset:scrollPoint animated:YES];
}

59、一个字符串是否包含另一个字符串

// 方法1
if ([str1 containsString:str2]) {NSLog(@"str1包含str2");} else {NSLog(@"str1不包含str2");}// 方法2
if ([str1 rangeOfString: str2].location == NSNotFound) {NSLog(@"str1不包含str2");} else {NSLog(@"str1包含str2");}

60、移除字符串中的空格和换行

+ (NSString *)removeSpaceAndNewline:(NSString *)str {NSString *temp = [str stringByReplacingOccurrencesOfString:@" " withString:@""];temp = [temp stringByReplacingOccurrencesOfString:@"\r" withString:@""];temp = [temp stringByReplacingOccurrencesOfString:@"\n" withString:@""];return temp;
}

61、判断字符串中是否有空格

+ (BOOL)isBlank:(NSString *)str {NSRange _range = [str rangeOfString:@" "];if (_range.location != NSNotFound) {//有空格return YES;} else {//没有空格return NO;}
}

62、获取一个视频的第一帧图片

    NSURL *url = [NSURL URLWithString:filepath];AVURLAsset *asset1 = [[AVURLAsset alloc] initWithURL:url options:nil];AVAssetImageGenerator *generate1 = [[AVAssetImageGenerator alloc] initWithAsset:asset1];generate1.appliesPreferredTrackTransform = YES;NSError *err = NULL;CMTime time = CMTimeMake(1, 2);CGImageRef oneRef = [generate1 copyCGImageAtTime:time actualTime:NULL error:&err];UIImage *one = [[UIImage alloc] initWithCGImage:oneRef];return one;

63、获取视频的时长

+ (NSInteger)getVideoTimeByUrlString:(NSString *)urlString {NSURL *videoUrl = [NSURL URLWithString:urlString];AVURLAsset *avUrl = [AVURLAsset assetWithURL:videoUrl];CMTime time = [avUrl duration];int seconds = ceil(time.value/time.timescale);return seconds;
}

64、字符串是否为空

+ (BOOL)isEqualToNil:(NSString *)str {return str.length <= 0 || [str isEqualToString:@""] || !str;
}

65、某个字体的高度

font.lineHeight;

66、删除某个view所有的子视图

[[someView subviews]makeObjectsPerformSelector:@selector(removeFromSuperview)];

67、删除NSUserDefaults所有记录

//方法一NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];   //方法二  
- (void)resetDefaults {   NSUserDefaults * defs = [NSUserDefaults standardUserDefaults];NSDictionary * dict = [defs dictionaryRepresentation];for (id key in dict) {[defs removeObjectForKey:key];}[defs synchronize];}
// 方法三
[[NSUserDefaults standardUserDefaults] setPersistentDomain:[NSDictionary dictionary] forName:[[NSBundle mainBundle] bundleIdentifier]];

68、禁用系统滑动返回功能

- (void)viewDidAppear:(BOOL)animated
{[super viewDidAppear:animated];
if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {self.navigationController.interactivePopGestureRecognizer.delegate = self;}
}- (void)viewWillDisappear:(BOOL)animated {[super viewWillDisappear:animated];if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {self.navigationController.interactivePopGestureRecognizer.delegate = nil;}
}
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{return NO;
}

69、UILabel设置内边距

//子类化UILabel，重写drawTextInRect方法
- (void)drawTextInRect:(CGRect)rect {// 边距，上左下右UIEdgeInsets insets = {0, 5, 0, 5};[super drawTextInRect:UIEdgeInsetsInsetRect(rect, insets)];
}

70、UILabel设置文字描边

//子类化UILabel，重写drawTextInRect方法
- (void)drawTextInRect:(CGRect)rect
{CGContextRef c = UIGraphicsGetCurrentContext();// 设置描边宽度CGContextSetLineWidth(c, 1);CGContextSetLineJoin(c, kCGLineJoinRound);CGContextSetTextDrawingMode(c, kCGTextStroke);// 描边颜色self.textColor = [UIColor redColor];[super drawTextInRect:rect];// 文本颜色self.textColor = [UIColor yellowColor];CGContextSetTextDrawingMode(c, kCGTextFill);[super drawTextInRect:rect];
}

71、UIView背景颜色渐变

    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 100)];[self.view addSubview:view];CAGradientLayer *gradient = [CAGradientLayer layer];gradient.frame = view.bounds;gradient.colors = [NSArray arrayWithObjects:(id)[[UIColor blackColor] CGColor], (id)[[UIColor whiteColor] CGColor], nil];[view.layer insertSublayer:gradient atIndex:0];

72、为UIView某个角添加圆角

// 左上角和右下角添加圆角UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:(UIRectCornerTopLeft | UIRectCornerBottomRight) cornerRadii:CGSizeMake(20, 20)];CAShapeLayer *maskLayer = [CAShapeLayer layer];maskLayer.frame = view.bounds;maskLayer.path = maskPath.CGPath;view.layer.mask = maskLayer;

73、改变视图层级

//将一个view放置在其兄弟视图的最下面
[parentView bringSubviewToFront:yourView]
//将一个view放置在其兄弟视图的最下面
[parentView sendSubviewToBack:yourView]

74、让手机震动一下

//导入框架
#import <AudioToolbox/AudioToolbox.h>
AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);
//或者
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

75、摇一摇功能

//1、打开摇一摇功能
[UIApplication sharedApplication].applicationSupportsShakeToEdit = YES;
//2、让需要摇动的控制器成为第一响应者
[self becomeFirstResponder];
//3、实现以下方法// 开始摇动
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
// 取消摇动
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event
// 摇动结束
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event

76、获取view的坐标在整个window上的位置

// v上的(0, 0)点在toView上的位置
CGPoint point = [v convertPoint:CGPointMake(0, 0) toView:[UIApplication sharedApplication].windows.lastObject];
或者
CGPoint point = [v.superview convertPoint:v.frame.origin toView:[UIApplication sharedApplication].windows.lastObject];

77、在非ViewController的地方弹出UIAlertController对话框

//  最好抽成一个分类
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Title" message:@"message" preferredStyle:UIAlertControllerStyleAlert];
//...
id rootViewController = [UIApplication sharedApplication].delegate.window.rootViewController;
if([rootViewController isKindOfClass:[UINavigationController class]])
{rootViewController = ((UINavigationController *)rootViewController).viewControllers.firstObject;
}
if([rootViewController isKindOfClass:[UITabBarController class]])
{rootViewController = ((UITabBarController *)rootViewController).selectedViewController;
}
[rootViewController presentViewController:alertController animated:YES completion:nil];

78、获取一个view所属的控制器

// view分类方法
- (UIViewController *)belongViewController {for (UIView *next = [self superview]; next; next = next.superview) {UIResponder* nextResponder = [next nextResponder];if ([nextResponder isKindOfClass:[UIViewController class]]) {return (UIViewController *)nextResponder;}}return nil;
}

79、UIImage和base64互转

// view分类方法
- (NSString *)encodeToBase64String:(UIImage *)image {return [UIImagePNGRepresentation(image) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}- (UIImage *)decodeBase64ToImage:(NSString *)strEncodeData {NSData *data = [[NSData alloc]initWithBase64EncodedString:strEncodeData options:NSDataBase64DecodingIgnoreUnknownCharacters];return [UIImage imageWithData:data];
}

80、判断NSDate是不是今天

NSDateComponents *otherDay = [[NSCalendar currentCalendar] components:NSCalendarUnitEra | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:aDate];
NSDateComponents *today = [[NSCalendar currentCalendar] components:NSCalendarUnitEra | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:[NSDate date]];
if([today day] == [otherDay day] &&[today month] == [otherDay month] &&[today year] == [otherDay year] &&[today era] == [otherDay era]) {// 是今天
}

81、设置屏幕方向

 NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeLeft];
[[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];
[UIViewController attemptRotationToDeviceOrientation];

82、比较两个颜色是否相等

- (BOOL)isEqualToColor:(UIColor *)otherColor {CGColorSpaceRef colorSpaceRGB = CGColorSpaceCreateDeviceRGB();UIColor *(^convertColorToRGBSpace)(UIColor*) = ^(UIColor *color) {if (CGColorSpaceGetModel(CGColorGetColorSpace(color.CGColor)) == kCGColorSpaceModelMonochrome) {const CGFloat *oldComponents = CGColorGetComponents(color.CGColor);CGFloat components[4] = {oldComponents[0], oldComponents[0], oldComponents[0], oldComponents[1]};CGColorRef colorRef = CGColorCreate( colorSpaceRGB, components );UIColor *color = [UIColor colorWithCGColor:colorRef];CGColorRelease(colorRef);return color;            } elsereturn color;};UIColor *selfColor = convertColorToRGBSpace(self);otherColor = convertColorToRGBSpace(otherColor);CGColorSpaceRelease(colorSpaceRGB);return [selfColor isEqual:otherColor];
}

83、tableViewCell分割线顶到头

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {[cell setSeparatorInset:UIEdgeInsetsZero];[cell setLayoutMargins:UIEdgeInsetsZero];cell.preservesSuperviewLayoutMargins = NO;
}- (void)viewDidLayoutSubviews {[self.tableView setSeparatorInset:UIEdgeInsetsZero];[self.tableView setLayoutMargins:UIEdgeInsetsZero];
}

84、将一个image保存在相册中

UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);//或者
#import <Photos/Photos.h>
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{PHAssetChangeRequest *changeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];changeRequest.creationDate          = [NSDate date];} completionHandler:^(BOOL success, NSError *error) {if (success) {NSLog(@"successfully saved");}else {NSLog(@"error saving to photos: %@", error);}}];

85、修改cell.imageView的大小

UIImage *icon = [UIImage imageNamed:@""];
CGSize itemSize = CGSizeMake(30, 30);
UIGraphicsBeginImageContextWithOptions(itemSize, NO ,0.0);
CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
[icon drawInRect:imageRect];
cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

86、为一个view添加虚线边框

 CAShapeLayer *border = [CAShapeLayer layer];border.strokeColor = [UIColor colorWithRed:67/255.0f green:37/255.0f blue:83/255.0f alpha:1].CGColor;border.fillColor = nil;border.lineDashPattern = @[@4, @2];border.path = [UIBezierPath bezierPathWithRect:view.bounds].CGPath;border.frame = view.bounds;[view.layer addSublayer:border];

87、UITextView中打开或禁用复制，剪切，选择，全选等功能

// 继承UITextView重写这个方法
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
// 返回NO为禁用，YES为开启// 粘贴if (action == @selector(paste:)) return NO;// 剪切if (action == @selector(cut:)) return NO;// 复制if (action == @selector(copy:)) return NO;// 选择if (action == @selector(select:)) return NO;// 选中全部if (action == @selector(selectAll:)) return NO;// 删除if (action == @selector(delete:)) return NO;// 分享if (action == @selector(share)) return NO;return [super canPerformAction:action withSender:sender];
}

88、设置UILabel行间距

NSMutableAttributedString* attrString = [[NSMutableAttributedString  alloc] initWithString:label.text];NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];[style setLineSpacing:20];[attrString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, label.text.length)];label.attributedText = attrString;

89、UILabel显示不同颜色字体

NSMutableAttributedString * string = [[NSMutableAttributedString alloc] initWithString:label.text];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0,5)];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(5,6)];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(11,5)];
label.attributedText = string;

90、比较两个NSDate相差多少小时

NSDate* date1 = someDate;NSDate* date2 = someOtherDate;NSTimeInterval distanceBetweenDates = [date1 timeIntervalSinceDate:date2];double secondsInAnHour = 3600;
// 除以3600是把秒化成小时，除以60得到结果为相差的分钟数NSInteger hoursBetweenDates = distanceBetweenDates / secondsInAnHour;

91、查看系统所有字体

// 打印字体
for (id familyName in [UIFont familyNames]) {NSLog(@"%@", familyName);for (id fontName in [UIFont fontNamesForFamilyName:familyName]) NSLog(@"  %@", fontName);
}

92、获取随机数

// 随机整数
NSInteger i = arc4random();
//获取随机数小数(0-1之间)
#define ARC4RANDOM_MAX      0x100000000
double val = ((double)arc4random() / ARC4RANDOM_MAX);

93、判断一个字符串是否为数字

NSCharacterSet *notDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];if ([str rangeOfCharacterFromSet:notDigits].location == NSNotFound){// 是数字} else{// 不是数字}

94、将一个view保存为pdf格式

- (void)createPDFfromUIView:(UIView*)aView saveToDocumentsWithFileName:(NSString*)aFilename
{NSMutableData *pdfData = [NSMutableData data];UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil);UIGraphicsBeginPDFPage();CGContextRef pdfContext = UIGraphicsGetCurrentContext();[aView.layer renderInContext:pdfContext];UIGraphicsEndPDFContext();NSArray* documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);NSString* documentDirectory = [documentDirectories objectAtIndex:0];NSString* documentDirectoryFilename = [documentDirectory stringByAppendingPathComponent:aFilename];[pdfData writeToFile:documentDirectoryFilename atomically:YES];NSLog(@"documentDirectoryFileName: %@",documentDirectoryFilename);
}

95、获取当前导航控制器下前一个控制器

- (UIViewController *)backViewController
{NSInteger myIndex = [self.navigationController.viewControllers indexOfObject:self];if ( myIndex != 0 && myIndex != NSNotFound ) {return [self.navigationController.viewControllers objectAtIndex:myIndex-1];} else {return nil;}
}

96、保存UIImage到本地

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Image.png"];[UIImagePNGRepresentation(image) writeToFile:filePath atomically:YES];

97、键盘上方增加工具栏

UIToolbar *keyboardDoneButtonView = [[UIToolbar alloc] init];
[keyboardDoneButtonView sizeToFit];
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleBordered target:self action:@selector(doneClicked:)];
[keyboardDoneButtonView setItems:[NSArray arrayWithObjects:doneButton, nil]];
txtField.inputAccessoryView = keyboardDoneButtonView;

98、在image上绘制文字并生成新的image

UIFont *font = [UIFont boldSystemFontOfSize:12];UIGraphicsBeginImageContext(image.size);[image drawInRect:CGRectMake(0,0,image.size.width,image.size.height)];CGRect rect = CGRectMake(point.x, point.y, image.size.width, image.size.height);[[UIColor whiteColor] set];[text drawInRect:CGRectIntegral(rect) withFont:font]; UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();

99、判断某一行的cell是否已经显示

CGRect cellRect = [tableView rectForRowAtIndexPath:indexPath];
BOOL completelyVisible = CGRectContainsRect(tableView.bounds, cellRect);

100、让导航控制器pop回指定的控制器

NSMutableArray *allViewControllers = [NSMutableArray arrayWithArray:[self.navigationController viewControllers]];
for (UIViewController *aViewController in allViewControllers) {if ([aViewController isKindOfClass:[RequiredViewController class]]) {[self.navigationController popToViewController:aViewController animated:NO];}
}

101、动画修改label上的文字

// 方法一
CATransition *animation = [CATransition animation];animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];animation.type = kCATransitionFade;animation.duration = 0.75;[self.label.layer addAnimation:animation forKey:@"kCATransitionFade"];self.label.text = @"New";// 方法二
[UIView transitionWithView:self.labelduration:0.25foptions:UIViewAnimationOptionTransitionCrossDissolveanimations:^{self.label.text = @"Well done!";} completion:nil];// 方法三
[UIView animateWithDuration:1.0animations:^{self.label.alpha = 0.0f;self.label.text = @"newText";self.label.alpha = 1.0f;}];

102、设置UIImage的透明度

// 方法一、添加UIImage分类
- (UIImage *)imageByApplyingAlpha:(CGFloat) alpha {UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f);CGContextRef ctx = UIGraphicsGetCurrentContext();CGRect area = CGRectMake(0, 0, self.size.width, self.size.height);CGContextScaleCTM(ctx, 1, -1);CGContextTranslateCTM(ctx, 0, -area.size.height);CGContextSetBlendMode(ctx, kCGBlendModeMultiply);CGContextSetAlpha(ctx, alpha);CGContextDrawImage(ctx, area, self.CGImage);UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return newImage;
}
// 方法二、如果没有奇葩需求，干脆用UIImageView设置透明度
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageWithName:@"yourImage"]];
imageView.alpha = 0.5;

103、获取手机RAM容量

// 需要导入#import <mach/mach.h>
mach_port_t host_port;mach_msg_type_number_t host_size;vm_size_t pagesize;host_port = mach_host_self();host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);host_page_size(host_port, &pagesize);vm_statistics_data_t vm_stat;if (host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size) != KERN_SUCCESS) {NSLog(@"Failed to fetch vm statistics");}/* Stats in bytes */natural_t mem_used = (vm_stat.active_count +vm_stat.inactive_count +vm_stat.wire_count) * pagesize;natural_t mem_free = vm_stat.free_count * pagesize;natural_t mem_total = mem_used + mem_free;NSLog(@"已用: %u 可用: %u 总共: %u", mem_used, mem_free, mem_total);

104、地图上两个点之间的实际距离

// 需要导入#import <CoreLocation/CoreLocation.h>
CLLocation *locA = [[CLLocation alloc] initWithLatitude:34 longitude:113];CLLocation *locB = [[CLLocation alloc] initWithLatitude:31.05 longitude:121.76];
// CLLocationDistance求出的单位为米CLLocationDistance distance = [locA distanceFromLocation:locB];

105、在应用中打开设置的某个界面

// 打开设置->通用
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=General"]];// 以下是设置其他界面
prefs:root=General&path=About
prefs:root=General&path=ACCESSIBILITY
prefs:root=AIRPLANE_MODE
prefs:root=General&path=AUTOLOCK
prefs:root=General&path=USAGE/CELLULAR_USAGE
prefs:root=Brightness
prefs:root=Bluetooth
prefs:root=General&path=DATE_AND_TIME
prefs:root=FACETIME
prefs:root=General
prefs:root=General&path=Keyboard
prefs:root=CASTLE
prefs:root=CASTLE&path=STORAGE_AND_BACKUP
prefs:root=General&path=INTERNATIONAL
prefs:root=LOCATION_SERVICES
prefs:root=ACCOUNT_SETTINGS
prefs:root=MUSIC
prefs:root=MUSIC&path=EQ
prefs:root=MUSIC&path=VolumeLimit
prefs:root=General&path=Network
prefs:root=NIKE_PLUS_IPOD
prefs:root=NOTES
prefs:root=NOTIFICATIONS_ID
prefs:root=Phone
prefs:root=Photos
prefs:root=General&path=ManagedConfigurationList
prefs:root=General&path=Reset
prefs:root=Sounds&path=Ringtone
prefs:root=Safari
prefs:root=General&path=Assistant
prefs:root=Sounds
prefs:root=General&path=SOFTWARE_UPDATE_LINK
prefs:root=STORE
prefs:root=TWITTER
prefs:root=FACEBOOK
prefs:root=General&path=USAGE prefs:root=VIDEO
prefs:root=General&path=Network/VPN
prefs:root=Wallpaper
prefs:root=WIFI
prefs:root=INTERNET_TETHERING
prefs:root=Phone&path=Blocked
prefs:root=DO_NOT_DISTURB

106、在UITextView中显示html文本

UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(20, 30, 100, 199)];textView.backgroundColor = [UIColor redColor];[self.view addSubview:textView];NSString *htmlString = @"<h1>Header</h1><h2>Subheader</h2><p>Some <em>text</em></p>![](http://blogs.babble.com/famecrawler/files/2010/11/mickey_mouse-1097.jpg)";NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData: [htmlString dataUsingEncoding:NSUnicodeStringEncoding] options: @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes: nil error: nil];textView.attributedText = attributedString;

107、监听scrollView是否滚动到了顶部／底部

-(void)scrollViewDidScroll: (UIScrollView*)scrollView
{float scrollViewHeight = scrollView.frame.size.height;float scrollContentSizeHeight = scrollView.contentSize.height;float scrollOffset = scrollView.contentOffset.y;if (scrollOffset == 0){// 滚动到了顶部}else if (scrollOffset + scrollViewHeight == scrollContentSizeHeight){// 滚动到了底部}
}

108、选中textField或者textView所有文本

[self.textView setSelectedTextRange:[self.textView textRangeFromPosition:self.textView.beginningOfDocument toPosition:self.textView.endOfDocument]]

109、从导航控制器中删除某个控制器

// 方法一、知道这个控制器所处的导航控制器下标
NSMutableArray *navigationArray = [[NSMutableArray alloc] initWithArray: self.navigationController.viewControllers];
[navigationArray removeObjectAtIndex: 2]; 
self.navigationController.viewControllers = navigationArray;// 方法二、知道具体是哪个控制器
NSArray* tempVCA = [self.navigationController viewControllers];for(UIViewController *tempVC in tempVCA)
{if([tempVC isKindOfClass:[urViewControllerClass class]]){[tempVC removeFromParentViewController];}
}

110、字符串encode编码

// 我们一般用这个方法处理stringByAddingPercentEscapesUsingEncoding但是这个方法好想不会处理／和&这种特殊符号，这种情况就需要用下边这个方法处理
@implementation NSString (NSString_Extended)
- (NSString *)urlencode {NSMutableString *output = [NSMutableString string];const unsigned char *source = (const unsigned char *)[self UTF8String];int sourceLen = strlen((const char *)source);for (int i = 0; i < sourceLen; ++i) {const unsigned char thisChar = source[i];if (thisChar == ' '){[output appendString:@"+"];} else if (thisChar == '.' || thisChar == '-' || thisChar == '_' || thisChar == '~' || (thisChar >= 'a' && thisChar <= 'z') ||(thisChar >= 'A' && thisChar <= 'Z') ||(thisChar >= '0' && thisChar <= '9')) {[output appendFormat:@"%c", thisChar];} else {[output appendFormat:@"%%%02X", thisChar];}}return output;
}

111、计算UILabel上某段文字的frame

@implementation UILabel (TextRect)- (CGRect)boundingRectForCharacterRange:(NSRange)range
{NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString:[self attributedText]];NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];[textStorage addLayoutManager:layoutManager];NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:[self bounds].size];textContainer.lineFragmentPadding = 0;[layoutManager addTextContainer:textContainer];NSRange glyphRange;[layoutManager characterRangeForGlyphRange:range actualGlyphRange:&glyphRange];return [layoutManager boundingRectForGlyphRange:glyphRange inTextContainer:textContainer];
}

112、获取随机UUID

NSString *result;if([[[UIDevice currentDevice] systemVersion] floatValue] > 6.0){result = [[NSUUID UUID] UUIDString];}else{CFUUIDRef uuidRef = CFUUIDCreate(NULL);CFStringRef uuid = CFUUIDCreateString(NULL, uuidRef);CFRelease(uuidRef);result = (__bridge_transfer NSString *)uuid;}

113、仿苹果抖动动画

#define RADIANS(degrees) (((degrees) * M_PI) / 180.0)- (void)startAnimate {view.transform = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(-5));[UIView animateWithDuration:0.25 delay:0.0 options:(UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse) animations:^ {view.transform = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(5));} completion:nil];
}- (void)stopAnimate {[UIView animateWithDuration:0.25 delay:0.0 options:(UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionCurveLinear) animations:^ {view.transform = CGAffineTransformIdentity;} completion:nil];
}

114、UITextField文字周围增加边距

 // 子类化UITextField，增加insert属性
@interface WZBTextField : UITextField
@property (nonatomic, assign) UIEdgeInsets insets;
@end// 在.m文件重写下列方法
- (CGRect)textRectForBounds:(CGRect)bounds {CGRect paddedRect = UIEdgeInsetsInsetRect(bounds, self.insets);if (self.rightViewMode == UITextFieldViewModeAlways || self.rightViewMode == UITextFieldViewModeUnlessEditing) {return [self adjustRectWithWidthRightView:paddedRect];}return paddedRect;
}- (CGRect)placeholderRectForBounds:(CGRect)bounds {CGRect paddedRect = UIEdgeInsetsInsetRect(bounds, self.insets);if (self.rightViewMode == UITextFieldViewModeAlways || self.rightViewMode == UITextFieldViewModeUnlessEditing) {return [self adjustRectWithWidthRightView:paddedRect];}return paddedRect;
}- (CGRect)editingRectForBounds:(CGRect)bounds {CGRect paddedRect = UIEdgeInsetsInsetRect(bounds, self.insets);if (self.rightViewMode == UITextFieldViewModeAlways || self.rightViewMode == UITextFieldViewModeWhileEditing) {return [self adjustRectWithWidthRightView:paddedRect];}return paddedRect;
}- (CGRect)adjustRectWithWidthRightView:(CGRect)bounds {CGRect paddedRect = bounds;paddedRect.size.width -= CGRectGetWidth(self.rightView.frame);return paddedRect;
}

115、设置UITextField光标位置

// textField需要设置的textField，index要设置的光标位置
- (void)cursorLocation:(UITextField *)textField index:(NSInteger)index
{NSRange range = NSMakeRange(index, 0);UITextPosition *start = [textField positionFromPosition:[textField beginningOfDocument] offset:range.location];UITextPosition *end = [textField positionFromPosition:start offset:range.length];[textField setSelectedTextRange:[textField textRangeFromPosition:start toPosition:end]];
}

116、解决当UIScrollView上有UIButton的时候，触摸到button滑动不了的问题

// 子类化UIScrollView，并重写以下方法
- (instancetype)initWithFrame:(CGRect)frame {if (self = [super initWithFrame:frame]) {self.delaysContentTouches = NO;}return self;
}- (BOOL)touchesShouldCancelInContentView:(UIView *)view {if ([view isKindOfClass:UIButton.class]) {return YES;}return [super touchesShouldCancelInContentView:view];
}

117、UITextView中的文字添加阴影效果

- (void)setTextLayer:(UITextView *)textView color:(UIColor *)color
{CALayer *textLayer = ((CALayer *)[textView.layer.sublayers objectAtIndex:0]);textLayer.shadowColor = color.CGColor;textLayer.shadowOffset = CGSizeMake(0.0f, 1.0f);textLayer.shadowOpacity = 1.0f;textLayer.shadowRadius = 1.0f;
}

118、MD5加密

+ (NSString *)md5:(NSString *)str
{const char *concat_str = [str UTF8String];unsigned char result[CC_MD5_DIGEST_LENGTH];CC_MD5(concat_str, (unsigned int)strlen(concat_str), result);NSMutableString *hash = [NSMutableString string];for (int i =0; i <16; i++){[hash appendFormat:@"%02X", result[i]];}return [hash uppercaseString];
}

119、base64加密

@interface NSData (Base64)
/***  @brief  字符串base64后转data*/
+ (NSData *)dataWithBase64EncodedString:(NSString *)string
{if (![string length]) return nil;NSData *decoded = nil;
#if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_9 || __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0if (![NSData instancesRespondToSelector:@selector(initWithBase64EncodedString:options:)]){
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"decoded = [[self alloc] initWithBase64Encoding:[string stringByReplacingOccurrencesOfString:@"[^A-Za-z0-9+/=]" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [string length])]];
#pragma clang diagnostic pop}else
#endif{decoded = [[self alloc] initWithBase64EncodedString:string options:NSDataBase64DecodingIgnoreUnknownCharacters];}return [decoded length]? decoded: nil;
}
/***  @brief  NSData转string*  @param wrapWidth 换行长度  76  64*/
- (NSString *)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth
{if (![self length]) return nil;NSString *encoded = nil;
#if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_9 || __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0if (![NSData instancesRespondToSelector:@selector(base64EncodedStringWithOptions:)]){
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"encoded = [self base64Encoding];
#pragma clang diagnostic pop}else
#endif{switch (wrapWidth){case 64:{return [self base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];}case 76:{return [self base64EncodedStringWithOptions:NSDataBase64Encoding76CharacterLineLength];}default:{encoded = [self base64EncodedStringWithOptions:(NSDataBase64EncodingOptions)0];}}}if (!wrapWidth || wrapWidth >= [encoded length]){return encoded;}wrapWidth = (wrapWidth / 4) * 4;NSMutableString *result = [NSMutableString string];for (NSUInteger i = 0; i < [encoded length]; i+= wrapWidth){if (i + wrapWidth >= [encoded length]){[result appendString:[encoded substringFromIndex:i]];break;}[result appendString:[encoded substringWithRange:NSMakeRange(i, wrapWidth)]];[result appendString:@"\r\n"];}return result;
}
/***  @brief  NSData转string 换行长度默认64*/
- (NSString *)base64EncodedString
{return [self base64EncodedStringWithWrapWidth:0];
}

120、AES加密

#import <CommonCrypto/CommonCryptor.h>
@interface NSData (AES)
/***  利用AES加密数据*/
- (NSData*)encryptedWithAESUsingKey:(NSString*)key andIV:(NSData*)iv {NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];size_t dataMoved;NSMutableData *encryptedData = [NSMutableData dataWithLength:self.length + kCCBlockSizeAES128];CCCryptorStatus status = CCCrypt(kCCEncrypt,kCCAlgorithmAES128,kCCOptionPKCS7Padding,keyData.bytes,keyData.length,iv.bytes,self.bytes,self.length,encryptedData.mutableBytes, encryptedData.length,&dataMoved);if (status == kCCSuccess) {encryptedData.length = dataMoved;return encryptedData;}return nil;}/***  @brief  利用AES解密据*/
- (NSData*)decryptedWithAESUsingKey:(NSString*)key andIV:(NSData*)iv {NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];size_t dataMoved;NSMutableData *decryptedData = [NSMutableData dataWithLength:self.length + kCCBlockSizeAES128];CCCryptorStatus result = CCCrypt(kCCDecrypt,kCCAlgorithmAES128,kCCOptionPKCS7Padding,keyData.bytes,keyData.length,iv.bytes,self.bytes,self.length,decryptedData.mutableBytes, decryptedData.length,&dataMoved);if (result == kCCSuccess) {decryptedData.length = dataMoved;return decryptedData;}return nil;}

121、tableView实现无限滚动

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{CGFloat actualPosition = scrollView.contentOffset.y;CGFloat contentHeight = scrollView.contentSize.height - scrollView.frame.size.height;if (actualPosition >= contentHeight) {[self.dataArr addObjectsFromArray:self.dataArr];[self.tableView reloadData];}
}

122、调整屏幕亮度

// brightness属性值在0-1之间，0代表最小亮度，1代表最大亮度
[[UIScreen mainScreen] setBrightness:0.5];

123、获取当前应用CUP用量

float cpu_usage()
{kern_return_t kr;task_info_data_t tinfo;mach_msg_type_number_t task_info_count;task_info_count = TASK_INFO_MAX;kr = task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)tinfo, &task_info_count);if (kr != KERN_SUCCESS) {return -1;}task_basic_info_t      basic_info;thread_array_t         thread_list;mach_msg_type_number_t thread_count;thread_info_data_t     thinfo;mach_msg_type_number_t thread_info_count;thread_basic_info_t basic_info_th;uint32_t stat_thread = 0; // Mach threadsbasic_info = (task_basic_info_t)tinfo;// get threads in the taskkr = task_threads(mach_task_self(), &thread_list, &thread_count);if (kr != KERN_SUCCESS) {return -1;}if (thread_count > 0)stat_thread += thread_count;long tot_sec = 0;long tot_usec = 0;float tot_cpu = 0;int j;for (j = 0; j < (int)thread_count; j++){thread_info_count = THREAD_INFO_MAX;kr = thread_info(thread_list[j], THREAD_BASIC_INFO,(thread_info_t)thinfo, &thread_info_count);if (kr != KERN_SUCCESS) {return -1;}basic_info_th = (thread_basic_info_t)thinfo;if (!(basic_info_th->flags & TH_FLAGS_IDLE)) {tot_sec = tot_sec + basic_info_th->user_time.seconds + basic_info_th->system_time.seconds;tot_usec = tot_usec + basic_info_th->user_time.microseconds + basic_info_th->system_time.microseconds;tot_cpu = tot_cpu + basic_info_th->cpu_usage / (float)TH_USAGE_SCALE * 100.0;}} // for each threadkr = vm_deallocate(mach_task_self(), (vm_offset_t)thread_list, thread_count * sizeof(thread_t));assert(kr == KERN_SUCCESS);return tot_cpu;
}

124、设置圆角和阴影

cell.contentView.layer.cornerRadius = 2.0f;
cell.contentView.layer.borderWidth = 1.0f;
cell.contentView.layer.borderColor = [UIColor clearColor].CGColor;
cell.contentView.layer.masksToBounds = YES;cell.layer.shadowColor = [UIColor lightGrayColor].CGColor;
cell.layer.shadowOffset = CGSizeMake(0, 2.0f);
cell.layer.shadowRadius = 2.0f;
cell.layer.shadowOpacity = 1.0f;
cell.layer.masksToBounds = NO;
cell.layer.shadowPath = [UIBezierPath bezierPathWithRoundedRect:cell.bounds cornerRadius:cell.contentView.layer.cornerRadius].CGPath;

125、处理字符串，使其首字母大写

NSString *str = @"abcdefghijklmn";NSString *resultStr;if (str && str.length > 0) {resultStr = [str stringByReplacingCharactersInRange:NSMakeRange(0,1) withString:[[str substringToIndex:1] capitalizedString]];}NSLog(@"%@", resultStr);

126、获取字符串中的数字

- (NSString *)getNumberFromStr:(NSString *)str
{NSCharacterSet *nonDigitCharacterSet = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];return [[str componentsSeparatedByCharactersInSet:nonDigitCharacterSet] componentsJoinedByString:@""];
}NSLog(@"%@", [self getNumberFromStr:@"a0b0c1d2e3f4fda8fa8fad9fsad23"]); // 00123488923

127、为UIView的某个方向添加边框

// 添加UIView分类// UIView+WZB.h
#import <UIKit/UIKit.h>/**边框方向- WZBBorderDirectionTop: 顶部- WZBBorderDirectionLeft: 左边- WZBBorderDirectionBottom: 底部- WZBBorderDirectionRight: 右边*/
typedef NS_ENUM(NSInteger, WZBBorderDirectionType) {WZBBorderDirectionTop = 0,WZBBorderDirectionLeft,WZBBorderDirectionBottom,WZBBorderDirectionRight
};@interface UIView (WZB)/**为UIView的某个方向添加边框@param direction 边框方向@param color 边框颜色@param width 边框宽度*/
- (void)wzb_addBorder:(WZBBorderDirectionType)direction color:(UIColor *)color width:(CGFloat)width;@end// UIView+WZB.m
#import "UIView+WZB.h"@implementation UIView (WZB)- (void)wzb_addBorder:(WZBBorderDirectionType)direction color:(UIColor *)color width:(CGFloat)width
{CALayer *border = [CALayer layer];border.backgroundColor = color.CGColor;switch (direction) {case WZBBorderDirectionTop:{border.frame = CGRectMake(0.0f, 0.0f, self.bounds.size.width, width);}break;case WZBBorderDirectionLeft:{border.frame = CGRectMake(0.0f, 0.0f, width, self.bounds.size.height);}break;case WZBBorderDirectionBottom:{border.frame = CGRectMake(0.0f, self.bounds.size.height - width, self.bounds.size.width, width);}break;case WZBBorderDirectionRight:{border.frame = CGRectMake(self.bounds.size.width - width, 0, width, self.bounds.size.height);}break;default:break;}[self.layer addSublayer:border];
}

128、修改image颜色

UIImage *image = [UIImage imageNamed:@"test"];imageView.image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];CGRect rect = CGRectMake(0, 0, image.size.width, image.size.height);UIGraphicsBeginImageContext(rect.size);CGContextRef context = UIGraphicsGetCurrentContext();CGContextClipToMask(context, rect, image.CGImage);CGContextSetFillColorWithColor(context, [[UIColor redColor] CGColor]);CGContextFillRect(context, rect);UIImage *img = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();UIImage *flippedImage = [UIImage imageWithCGImage:img.CGImage scale:1.0 orientation: UIImageOrientationDownMirrored];imageView.image = flippedImage;

129、压缩图片

-(UIImage *)resizeImage:(UIImage *)image
{float actualHeight = image.size.height;float actualWidth = image.size.width;float maxHeight = 300.0;float maxWidth = 400.0;float imgRatio = actualWidth/actualHeight;float maxRatio = maxWidth/maxHeight;float compressionQuality = 0.5;//50 percent compressionif (actualHeight > maxHeight || actualWidth > maxWidth){if(imgRatio < maxRatio){//adjust width according to maxHeightimgRatio = maxHeight / actualHeight;actualWidth = imgRatio * actualWidth;actualHeight = maxHeight;}else if(imgRatio > maxRatio){//adjust height according to maxWidthimgRatio = maxWidth / actualWidth;actualHeight = imgRatio * actualHeight;actualWidth = maxWidth;}else{actualHeight = maxHeight;actualWidth = maxWidth;}}CGRect rect = CGRectMake(0.0, 0.0, actualWidth, actualHeight);UIGraphicsBeginImageContext(rect.size);[image drawInRect:rect];UIImage *img = UIGraphicsGetImageFromCurrentImageContext();NSData *imageData = UIImageJPEGRepresentation(img, compressionQuality);UIGraphicsEndImageContext();return [UIImage imageWithData:imageData];}