ios - 如何在动画中点击按钮时使按钮消失

Question

我创建了一个按钮并为它设置了一些动画，但现在我无法在它运动时点击它或与之交互，如果它允许我点击它，我会收到错误消息。我的目标是当你点击它时，让按钮在移动时消失。请帮忙!!提前致谢!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    // Create button
    let button   = UIButton.buttonWithType(UIButtonType.System) as UIButton
    button.frame = CGRectMake(100, 100, 100, 100)
    button.setTitle("Test Button", forState: UIControlState.Normal)
    button.addTarget(self, action: "buttonAction", forControlEvents: UIControlEvents.TouchUpInside)

    self.view.addSubview(button)

    UIView.animateWithDuration(4, delay: 3, options: UIViewAnimationOptions.AllowUserInteraction | UIViewAnimationOptions.LayoutSubviews | UIViewAnimationOptions.Autoreverse, animations: {
        button.frame = CGRectMake(100, 300, 100, 100)
        }, completion: nil)

    // Create a function that makes the button dissapear when it is tapped
    func buttonAction() {

        button.alpha = 0
    }

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

Answer 1

为了修复崩溃，您需要将 buttonAction 函数移出 viewDidLoad 范围并像这样修改它:

func buttonAction(button: UIButton) {

    button.alpha = 0
}

您还需要将 button.addTarget(...) param action 从这个“buttonAction”更改为这个“buttonAction:” .看下面的代码

button.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)