swift – 如何以编程方式创建UIButton

我正在以编程方式构建UIViews。如何在Swift中获取具有动作功能的UIButton？

以下代码不会得到任何操作：

let btn: UIButton = UIButton(frame: CGRectMake(100,400,100,50))
btn.backgroundColor = UIColor.greenColor()
btn.setTitle("Click Me",forState: UIControlState.normal)
btn.addTarget(self,action: "buttonAction:",forControlEvents: UIControlEvents.TouchUpInside)
self.view.addSubview(buttonPuzzle)

以下选择器功能是：

func buttonAction(sender: UIButton!) {
    var btnsendtag: UIButton = sender
}

你只是错过了这个UIButton。为了补偿这一点，请更改其标签属性。
这是你回答：

let btn: UIButton = UIButton(frame: CGRectMake(100,forControlEvents: UIControlEvents.TouchUpInside)
btn.tag = 1               // change tag property
self.view.addSubview(btn) // add to view as subview

Swift 3.0

let btn: UIButton = UIButton(frame: CGRect(x: 100,y: 400,width: 100,height: 50))
btn.backgroundColor = UIColor.green
btn.setTitle(title: "Click Me",for: .normal)
btn.addTarget(self,action: #selector(buttonAction),forControlEvents: .touchUpInside)
btn.tag = 1               
self.view.addSubview(btn)

这是一个示例选择器函数：

func buttonAction(sender: UIButton!) {
    var btnsendtag: UIButton = sender
    if btnsendtag.tag == 1 {            
        //do anything here
    }
}