Xcode9学习笔记22 - UIButton控件的使用(边框、圆角、背景色、标题、类型)

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let bt1 = UIButton(type: UIButtonType.infoDark)//创建一个深色背景的提示信息按钮
bt1.frame = CGRect(x: 138, y: 80, width: 40, height: 40)//设置按钮的坐标尺寸

let bt2 = UIButton(type: UIButtonType.roundedRect)//创建一个普通的圆角按钮
bt2.frame = CGRect(x: 80, y: 180, width: 150, height: 44)
bt2.backgroundColor = UIColor.purple//设置按钮背景颜色
bt2.tintColor = UIColor.yellow//设置按钮前景颜色
bt2.setTitle("Tap me", for: UIControlState())//设置按钮的标题文字
//给按钮绑定点击事件
bt2.addTarget(self, action: #selector(ViewController.buttonTap(_:)), for: UIControlEvents.touchUpInside)

let bt3 = UIButton(type: UIButtonType.roundedRect)
bt3.backgroundColor = UIColor.brown
bt3.tintColor = UIColor.white
bt3.setTitle("Tap me", for: UIControlState())
bt3.frame = CGRect(x: 80, y: 280, width: 150, height: 44)
bt3.layer.masksToBounds = true//给按钮添加边框效果
bt3.layer.cornerRadius = 10//设置按钮的圆角半径
bt3.layer.borderWidth = 4//设置边框宽度
bt3.layer.borderColor = UIColor.lightGray.cgColor//设置按钮层边框的颜色

self.view.addSubview(bt1)//将3个按钮添加到当前视图控制器的根视图
self.view.addSubview(bt2)
self.view.addSubview(bt3)
}

@objc func buttonTap(_ button:UIButton) {
let alert = UIAlertController(title: "Information", message: "UIButton Event.", preferredStyle: UIAlertControllerStyle.alert)//创建一个警告弹出窗口
//创建一个按钮作为警告窗口的“确定”按钮
let OKAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil)
alert.addAction(OKAction)//将确定按钮添加到警告窗口中
self.present(alert, animated: true, completion: nil)//在当前视图控制器中，展示提示窗口
}