我以前做的swift笔记, 之前都是整理在onenote上, 最近想到整理出博客. 也方便自己查找, 可以当做自己的一份文档.
import UIKitclass ViewController: UIViewController {var numText1: UITextField?var numText2: UITextField?var sumLabel: UILabel?override func viewDidLoad() {super.viewDidLoad()setupUI()}func setupUI() {let textField1 = UITextField(frame: CGRect(x: 20, y: 40, width: 100, height: 30))numText1 = textField1textField1.borderStyle = UITextBorderStyle.roundedRecttextField1.text = "0"view.addSubview(textField1)let textField2 = UITextField(frame: CGRect(x: 140, y: 40, width: 100, height: 30))numText2 = textField2textField2.borderStyle = UITextBorderStyle.roundedRecttextField2.text = "0"view.addSubview(textField2)let label1 = UILabel(frame: CGRect(x: 120, y: 40, width: 20, height: 30))label1.text = "+"label1.textAlignment = .centerview.addSubview(label1)let label2 = UILabel(frame: CGRect(x: 240, y: 40, width: 20, height: 30))label2.text = "="label2.textAlignment = .centerview.addSubview(label2)let label3 = UILabel(frame: CGRect(x: 260, y: 40, width: 50, height: 30))sumLabel = label3label3.text = "0"label3.textAlignment = .rightview.addSubview(label3)let button1 = UIButton()button1.center = view.centerbutton1.setTitle("计算", for: .normal)button1.sizeToFit()button1.setTitleColor(UIColor.black, for: .normal)button1.addTarget(self, action: #selector(calc), for: .touchUpInside)view.addSubview(button1)}func calc() {print(#function)let num1 = Int(numText1?.text ?? "")print(num1)let num2 = Int(numText2?.text ?? "")guard let text1 = num1,let text2 = num2 else {print("必须都输入数字才能计算")return}sumLabel?.text = "\(text1 + text2)"}}
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