Swift 如何以编程方式创建UIButton

我正在尝试以编程方式构建

UIView

s。如何在Swift中获得带有动作功能的

ui按钮

以下代码未获得任何操作：

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
}

---

您只是缺少了这是哪个

ui按钮。要对此进行补偿，请更改其
标记
属性。

以下是你的答案：

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)
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)

下面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
    }
}

您必须添加子视图和标记，使用标记是一个脆弱的解决方案。您有一个视图，并且您正在创建该视图并将该按钮添加到该视图中，您只需要保留对该视图的引用：例如

在您的课堂上，保留对按钮的引用

var customButton: UIButton!

func buttonAction(sender: UIButton!) {
    guard sender == customButton else { return }

    // Do anything you actually want to do here
}

创建按钮并设置参考

let btn = UIButton(frame: CGRect(x: 100, y: 400, width: 100, height: 50))
btn.backgroundColor = .greenColor()
btn.setTitle("Click Me", forState: .Normal)
btn.addTarget(self, action: #selector(MyClass.buttonAction), forControlEvents: .TouchUpInside)
self.view.addSubview(btn)
customButton = btn

在操作函数中测试此实例

var customButton: UIButton!

func buttonAction(sender: UIButton!) {
    guard sender == customButton else { return }

    // Do anything you actually want to do here
}

如果sender.tag==1{…}非常小，但您忘记了
btn
之后和
=/code>之前的空格，则此处：
让btn=ui按钮…