Swift - 按钮（UIButton）的用法

import UIKit

class ViewController: UIViewController {

override func viewDidLoad() {
super.viewDidLoad()

// 创建一个ContactAdd类型的按钮
let button = UIButton(type: .ContactAdd)
button.frame = CGRectMake(10, 150, 100, 30)
button.setTitle("按钮", forState: UIControlState.Normal)
self.view.addSubview(button)

// 对于 Custom定制类型按钮，代码可以简化为
let btn = UIButton(frame: CGRectMake(10,200,100,30))
self.view.addSubview(btn)

// 按钮文字设置
btn.setTitle("普通", forState: UIControlState.Normal)
btn.setTitle("触摸", forState: UIControlState.Highlighted)
btn.setTitle("禁用", forState: UIControlState.Disabled)

// 按钮文字颜色设置
btn.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Normal)

// 按钮文字阴影颜色设置
btn.setTitleShadowColor(UIColor.grayColor(), forState: UIControlState.Normal)

// 按钮背景颜色
btn.backgroundColor = UIColor.blueColor()

// 按钮文字图标的设置
btn.setImage(UIImage(named: "icon1"), forState: UIControlState.Normal)
btn.adjustsImageWhenHighlighted = false // 触摸按钮也不会变暗
btn.adjustsImageWhenDisabled = false // 禁用下按钮也不会变暗

// 设置按钮背景图片
btn.setBackgroundImage(UIImage(named: "background1"), forState: UIControlState.Normal)

// 按钮触摸事件响应
btn.addTarget(self, action: #selector(tapped(_:)), forControlEvents: UIControlEvents.TouchUpInside)

}

/**
按钮触摸事件方法
*/
func tapped(button:UIButton){
print(button.titleForState(UIControlState.Normal))
}
}