如何以编程方式创建按钮？ [英] How to create a button programmatically?

问题描述

如何在Swift中以编程方式创建图形元素（如 UIButton ）？我试图在视图中创建并添加按钮，但无法进行。

How do I programmatically create graphical elements (like a UIButton) in Swift? I tried to create and add button into a view, but wasn't able to.

推荐答案

这是一个完整的添加解决方案一个 UIButton 以编程方式使用 targetAction 。

Swift 2.2

Here is a complete solution to add a UIButton programmatically with the targetAction.
Swift 2.2

override func viewDidLoad() {
  super.viewDidLoad()

  let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
  button.backgroundColor = .greenColor()
  button.setTitle("Test Button", forState: .Normal)
  button.addTarget(self, action: #selector(buttonAction), forControlEvents: .TouchUpInside)

  self.view.addSubview(button)
}

func buttonAction(sender: UIButton!) {
  print("Button tapped")
}

最好使用 NSLayoutConstraint 而不是 frame 来正确放置按钮对于每个iPhone屏幕。

It is probably better to use NSLayoutConstraint rather than frame to correctly place the button for each iPhone screen.

更新了鳕鱼e到 Swift 3.1 ：

override func viewDidLoad() {
  super.viewDidLoad()

  let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
  button.backgroundColor = .green
  button.setTitle("Test Button", for: .normal)
  button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)

  self.view.addSubview(button)
}

func buttonAction(sender: UIButton!) {
  print("Button tapped")
}

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