Swift4.0创建按钮UIButton

适宜有一定ios开发基础人群

1.打开xcode

2.点击导航栏的file----new----project

3.选择single View App

4.填入Product Name,在language那一栏选择Swift,下一步

5.此时你的项目中有两个后缀为.Swift的文件(Appdelegate ViewController)

6.点击Viewcontroller.swift文件,在Viewdidload接口中创建你的按钮

直接上代码

let newButton:UIButton = UIButton(frame: CGRect(x: 0, y: 20, width: 50, height: 50))
        newButton.backgroundColor = UIColor.blue
        newButton.setTitle("点我", for: .normal)
        newButton.addTarget(self, action: #selector(newButtonAction), for: .touchUpInside)
        self.view.addSubview(newButton)

点击事件

@objc func newButtonAction() {
        print("select new button")
    }