《iOS 8开发指南》，自己总结用

UITextView

文本视图（UITextView）与文本框类似，差别在于文本视图可显示一个可滚动和编辑的文本块，供用户阅读或修改。仅当需要的的输入很多时，才应使用文本视图。

Attribute Inspector分为3部分(TextField, control, view)
(1) Text:设置文本框的默认文本
(2) Placeholder:可以在文本框中显示灰色的字，用于提示用户应该在这个文本框输入什么内容。输入文字，自动消失。
(3) Background：设置背景
(4) Disabled：若选中此项，用户将不能更改文本框内容
(5) 接下来是3个按钮，用来设置对齐方式
(6) Border Style：选择边界风格
(7) 清楚按钮
——》Never appears:从不出现
——》Appears while editing：编辑时出现
——》Appears unless editing: 编辑时不出现
——》Is always visible:总是可见
(8) Clear when editing begins:若选中此项，则当开始编辑这个文本框时，文本框中之前的内容会被清除掉。
(9)设置文本框中文本的颜色
(10)Font：设置文本的字体与字号
(11)Min Font Size :最小字体
(12)Adjust To Fit:指定文本框尺寸缩小时文本框中的文本是否也要缩小。选择它，可以使得全本文本都可见，及时文本可长。但是这个选项要跟Min Font Size配合使用，文本再缩小，也不会小于设定的Min Font Size.
(13)Capitalization:设置大写。下啦菜单中有4个选项。
——》None：不设置大写
——》Words：每个单词首字母大写，这里的单词指的是以空格分开的字符串
——》Sentences：每个句子的第一个字母大写，这里的句子是以句号加空格分开的字符串
——》 All Characters:所有字母大写
(14) Correction:检查拼写，默认是YES
(15)Keyboard：选择键盘类型，比如全数字、字母和数字等
(16)Return Key:选择返回键，可以选择Search、Return、Done等
(17)Auto-enable Return Key:如选择此项，则只有至少在文本框输入一个字符后键盘的返回键才有效。
(18)Secure:当你的文本框用作密码输入框时，可以选择此项。

常用属性

(1) textColor
(2) font
(3) editable
(4) textAlignment
——》UITextAlignmentRight:右对齐
——》UITextAlignmentCenter:居中对齐
——》UITextAlignmentLeft:左对齐

在屏幕中换行显示文本

//TextView
-(void)testUITextView1{UITextView *textView = [[UITextView alloc]init];textView.frame = self.view.bounds;textView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
//    textView.editable = NO;//不可编辑textView.backgroundColor = [UIColor blackColor];//背景为黑色textView.textColor = [UIColor whiteColor];//字符为白色textView.font = [UIFont systemFontOfSize:32];//字体的设置//textView.textAlignment = NSTextAlignmentCenter;textView.text = @"学习UITextView\n""第2行\n""第3行\n""第3行\n""第4行\n""第5行\n""第6行\n""第7行\n""第8行\n""第9行\n""第10行\n""第11行\n""第12行\n";[self.view addSubview:textView];
}

在屏幕中显示可编辑的文本

-(void)testUITextView2{self.uiTextView2 = [[UITextView alloc]init];self.uiTextView2.frame = self.view.bounds;self.uiTextView2.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;self.uiTextView2.delegate = self;self.uiTextView2.text = @"亲们，可以编辑这一段文本";[self.view addSubview:self.uiTextView2];
}- (void)viewWillAppear:(BOOL)animated{[super viewWillAppear:animated];[self.navigationController setNavigationBarHidden:NO animated:YES];[self.navigationController setToolbarHidden:NO animated:YES];
}- (void)viewDidAppear:(BOOL)animated{[super viewDidAppear:animated];[self textViewDidEndEditing:self.uiTextView2]; //画面显示时， 设置为非编辑模式
}- (void)viewWillDisappear:(BOOL)animated{[super viewWillDisappear:animated];[self.uiTextView2 resignFirstResponder];//画面跳转时设置为非编辑模式
}- (void)textViewDidBeginEditing:(UITextView *)textView{static const CGFloat kKeyboardHeight = 216.0;//按钮设置为【完成】self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneDidPush)];[UIView beginAnimations:nil context:nil];[UIView setAnimationDuration:0.3];//缩小UITextView以免被键盘挡住CGRect textViewFrame = textView.frame;textViewFrame.size.height = self.view.bounds.size.height - kKeyboardHeight;textView.frame = textViewFrame;//工具条位置上移CGRect toolbarFrame = self.navigationController.toolbar.frame;toolbarFrame.origin.y = self.view.window.bounds.size.height - toolbarFrame.size.height - kKeyboardHeight;self.navigationController.toolbar.frame = toolbarFrame;[UIView commitAnimations];
}- (void)textViewDidEndEditing:(UITextView *)textView{// 按钮设置为【编辑】self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:@selector(editDidPush)];[UIView beginAnimations:nil context:nil];[UIView setAnimationDuration:0.3];// 恢复UITextView的尺寸textView.frame = self.view.bounds;//恢复工具条的位置CGRect toolbarFrame = self.navigationController.toolbar.frame;toolbarFrame.origin.y = self.view.window.bounds.size.height - toolbarFrame.size.height;self.navigationController.toolbar.frame = toolbarFrame;[UIView commitAnimations];
}-(void)editDidPush{[self.uiTextView2 becomeFirstResponder];
}-(void)doneDidPush{[self.uiTextView2 resignFirstResponder];
}

-(void)testUITextView3{//UITextView的追加self.uiTextView3 = [[UITextView alloc]init];self.uiTextView3.frame = self.view.bounds;self.uiTextView3.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;self.uiTextView3.text = @"此文本可编辑";// [self.view addSubview:self.uiTextView3];//在工具条中追加UIBarButtonItem *hasTextButton = [[UIBarButtonItem alloc] initWithTitle:@"hasText" style:UIBarButtonItemStylePlain target:self action:@selector(hasTextDidPush)];UIBarButtonItem *selectionButton = [[UIBarButtonItem alloc]initWithTitle:@"selction" style:UIBarButtonItemStylePlain target:self action:@selector(selectionDidPush)];UIBarButtonItem *alignmentButton = [[UIBarButtonItem alloc]initWithTitle:@"alignment" style:UIBarButtonItemStylePlain target:self action:@selector(alignmentDidPush)];UIBarButtonItem *scrollButton = [[UIBarButtonItem alloc]initWithTitle:@"" style:UIBarButtonItemStylePlain target:self action:@selector(scrollDidPush)];NSArray *buttons = [NSArray arrayWithObjects:hasTextButton, selectionButton, alignmentButton, scrollButton,nil];[self setToolbarItems:buttons animated:YES];
}- (void)viewDidAppear:(BOOL)animated{[super viewDidAppear:animated];static const CGFloat kKeyboardHeight = 216.0;//调整工具条位置[UIView beginAnimations:nil context:nil];[UIView setAnimationDuration:0.3];self.uiTextView3.frame = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height - kKeyboardHeight);CGRect  toolbarFrame = self.navigationController.toolbar.frame;toolbarFrame.origin.y = self.view.window.bounds.size.height - toolbarFrame.size.height - kKeyboardHeight;self.navigationController.toolbar.frame = toolbarFrame;[UIView commitAnimations];[self.uiTextView3 becomeFirstResponder]; // 画面显示时显示键盘
}-(void)viewWillDisappear:(BOOL)animated{[super viewWillDisappear:animated];// 恢复工具条[UIView beginAnimations:nil context:nil];[UIView setAnimationDuration:0.3];self.uiTextView3.frame = self.view.bounds;CGRect toolbarFrame = self.navigationController.toolbar.frame;toolbarFrame.origin.y = self.view.window.bounds.size.height - toolbarFrame.size.height;self.navigationController.toolbar.frame = toolbarFrame;[UIView commitAnimations];[self.uiTextView3 resignFirstResponder];
}-(void)hasTextDidPush{UIAlertView *alert = [[UIAlertView alloc]init];if(self.uiTextView3.hasText) {alert.message = @"textView.hasText = YES";} else {alert.message = @"textView.hasText = NO";}[alert addButtonWithTitle:@"OK"];[alert show];
}-(void)selectionDidPush{UIAlertView *alert = [[UIAlertView alloc]init];alert.message = [NSString stringWithFormat:@"location = %lu, length = %d", (unsigned long)self.uiTextView3.selectedRange.location, self.uiTextView3.selectedRange.length];[alert addButtonWithTitle:@"OK"];[alert show];
}-(void)alignmentDidPush{self.uiTextView3.editable = NO;if(UITextAlignmentRight < ++self.uiTextView3.textAlignment) {self.uiTextView3.textAlignment = UITextAlignmentLeft;}self.uiTextView3.editable = YES;
}-(void)scrollDidPush{//NSRange scrollRange = NSMakeRange(0, 1);[self.uiTextView3 scrollRangeToVisible:NSMakeRange(0, 1)];
}