先讲一下思路
我们继承UIView写一个LTView，用UILabel和UITextField作为LTView的子View.
1.首先创建一个新文件，选择xcode菜单，File －> New -> File
2.得到文件LTView.swift，我们给LTView创建两个属性，并对其初始化法
3.这时会出现一个系统能够自动修改的 错误，所以我们利用系统的错误修正功能对其自行修正，会自动补上下列代码
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
4.下面我们写布局一个子视图的方法setupSubView，初始化label和textField
func setupSubView(){
//初始化这两个属性label和textField
self.label = UILabel(frame: CGRect(x: 0, y: 0, width: self.frame.size.width*0.2, height: self.frame.size.height))
self.label.backgroundColor = #colorLiteral(red: 0.8039215803, green: 0.8039215803, blue: 0.8039215803, alpha: 1)
//设置文字居中
self.label.textAlignment = .center
//切圆角
self.label.layer.cornerRadius = 5
self.label.clipsToBounds = true
self.addSubview(label)//添加到LTView上
self.textField = UITextField(frame: CGRect(x: self.frame.size.width*0.2+10, y: 0, width: self.frame.size.width*0.8-10, height: self.frame.size.height))
//定义圆角模式
self.textField.borderStyle = .roundedRect
//设置密闻输入
self.textField.isSecureTextEntry = true
self.textField.backgroundColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)
self.addSubview(textField)
}
4.回到 初始化方法中，对新定义的setupSubView方法进行调用
override init(frame: CGRect) {
//调用父类对这个方法的实现
super.init(frame: frame)
self.setupSubView() //调用子视图方法
}
5.进入AppDelegate.swift中
class AppDelegate: UIResponder, UIApplicationDelegate ,UITextFieldDelegate{
//UITextFieldDelegate代理需要遵守的协议
var window: UIWindow?
//定义为全局的变量
var textField:UITextField!
var textField2:UITextField!
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame: UIScreen.main.bounds)
self.window?.backgroundColor = #colorLiteral(red: 0.9098039269, green: 0.4784313738, blue: 0.6431372762, alpha: 1)
self.window?.makeKeyAndVisible()
self.window?.rootViewController = ViewController()
let image = UIImageView(image: UIImage(named: "girl2.jpg"))
image.frame = CGRect(x: 100, y: 50, width: 200, height: 200)
//对图片进行切圆角处理
image.layer.cornerRadius = 100;
image.clipsToBounds = true
self.window?.addSubview(image)
let aLTView = LTView(frame: CGRect(x: 7, y: 300, width: 400, height: 50))
aLTView.label.text = "用户名"
//文本对齐格式,textAlignment是一个枚举，所以可以省略类型名
//aLTView.label.textAlignment = NSTextAlignment.center
aLTView.label.textAlignment = .center
aLTView.textField.placeholder = "请输入用户名"
aLTView.textField.delegate = self
self.window?.addSubview(aLTView)
let bLTView = LTView(frame: CGRect(x: 7, y: 370, width: 400, height: 50))
bLTView.label.text = "密码"
//提示字符
bLTView.textField.placeholder = "请输入密码"
//设置代理
bLTView.textField.delegate = self
self.window?.addSubview(bLTView)
let registerButton = UIButton(frame: CGRect(x: 80, y: 500, width: 100, height: 50))
registerButton.backgroundColor = UIColor.gray
registerButton.setTitle("登录", for: .normal)
self.window?.addSubview(registerButton)
let cancelButton = UIButton(frame: CGRect(x: 220, y: 500, width: 100, height: 50))
cancelButton.backgroundColor = UIColor.gray
cancelButton.setTitle("取消", for: .normal)
self.window?.addSubview(cancelButton)
textField = aLTView.textField
textField2 = bLTView.textField
return true
}
//点击return收起键盘
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
//第一响应事件
textField.resignFirstResponder()
return true }
//点击空白处收起键盘
override func touchesBegan(_ touches: Set, with event: UIEvent?) {
textField.resignFirstResponder()
textField2.resignFirstResponder()
}
func applicationWillResignActive(_ application: UIApplication) {
}
func applicationDidEnterBackground(_ application: UIApplication) {
}
func applicationWillEnterForeground(_ application: UIApplication) {
}
func applicationDidBecomeActive(_ application: UIApplication) {
}
func applicationWillTerminate(_ application: UIApplication) {
}
}
最终效果
