从按钮操作中快速重新加载文本字段

Question

我有一个按钮，可以创建更多带有文本字段的按钮：

func CreateButtonWithIndex(index:Int) {
  let newButton = UIButton.buttonWithType(UIButtonType.System) as UIButton
  newButton.setTitle(“Button”, forState: UIControlState.Normal)
  newButton.addTarget(self, action: Selector("go:"), forControlEvents: UIControlEvents.TouchUpInside)

  newButton.tag = index+1;
  var textFieldButton: UITextField = UITextField()
  textFieldButton.tag = index+1;
  textFieldButton.text = “textfield”
  self.view.addSubview(textFieldButton)
  self.view.addSubview(newButton)
}

func go(sender: AnyObject) {
   println(“ok press button“)
}

如何检测与按下的按钮对应的文本字段？

Answer 1

将发送者转换为 UIButton

@IBAction func go(sender: AnyObject) {
   let yourButton = sender as UIButton

   println(yourButton.titleLabel.text)

}

更好的是，如果您确定只有按钮会调用“go”操作，您可以改为这样做：

@IBAction func go(sender: UIButton) {

    println(sender.titleLabel.text)

    if(sender.titleLabel.text == "OK")
        println("OK button was pressed")

}

更多信息可以在 Apple's Strings & Characters Swift documentation 的“比较字符串”部分和我找到的@IBOutlet in this tutorial 中找到。

Answer 2

子类 UIButton。将 UITextField 变量添加到子类 UIButton。创建 UIButton 子类后分配新的 UITextField 变量。

UIButton 子类：

class TextFieldButton: UIButton {
    var textField: UITextField! // use this to reference the related text field
}

你其他类的代码：

    func CreateButtonWithIndex(index:Int) {
        let newButton = UIButton.buttonWithType(UIButtonType.System) as TextFieldButton // use our new subclass
        newButton.setTitle(“Button”, forState: UIControlState.Normal)
        newButton.addTarget(self, action: Selector("go:"), forControlEvents: UIControlEvents.TouchUpInside)

        newButton.tag = index+1;
        var textFieldButton: UITextField = UITextField()
        textFieldButton.tag = index+1;
        textFieldButton.text = "textfield"

        newButton.textField = textFieldButton  // set reference to the text field
        self.view.addSubview(textFieldButton)
        self.view.addSubview(newButton)
    }

    func go(sender: AnyObject) {
        println("ok press button")
        println(sender.textField) // now we can access the related text field
    }