ios - 动画按钮允许用户交互不起作用

Question

我在 NSObject 类的代码中创建了一个 UIbutton，它控制 UIViewController 类中的游戏。该按钮在游戏的大部分时间都可以正常工作，但在某个时刻我希望该按钮淡入/淡出。一旦淡入/淡出开始动画，按钮就不再具有交互性。我已经设置了 .AllowUserInteraction 选项，但仍然没有运气。我被这个难住了，所以非常感谢任何帮助!

Class GameController: NSObject {
var gameView: UIView!
var nextButton: UIButton!

func gameViewSetUp() {
    // create the nextButton
    let imageNextButton = UIImage(named: "rightArrow") as UIImage?
    self.nextButton = UIButton(type: .Custom)
    nextButton.frame = CGRectMake(ScreenWidth-100,ScreenHeight-250,60,60)
    nextButton.setTitle("", forState: UIControlState.Normal)
    nextButton.setImage(imageNextButton, forState: .Normal)
    nextButton.contentMode = .ScaleAspectFill
    nextButton.backgroundColor = UIColor.clearColor()
    nextButton.layer.cornerRadius = 5.0
    nextButton.layer.borderWidth = 2.5
    nextButton.layer.borderColor = UIColor.clearColor().CGColor
    nextButton.addTarget(self, action: "nextPressed", forControlEvents: .TouchUpInside)
    nextButton.userInteractionEnabled = true
    gameView.addSubview(nextButton)

func playStageX() { 
       nextButtonWink()
    }
}

func nextButtonWink() {
    UIView.animateWithDuration(1.5, delay: 0, options: [.AllowUserInteraction, .Repeat, .CurveEaseInOut, .Autoreverse],
        animations: {
 // self.nextButton.userInteractionEnabled = true // I tried this as well but no impact.
            self.nextButton.alpha = 0
        }, completion: nil)
}

class GameViewController: UIViewController {
private var controller: GameController
required init?(coder aDecoder: NSCoder) {
    controller = GameController()
    super.init(coder: aDecoder)
}
override func viewDidLoad() {
    super.viewDidLoad()   
    let gameView = UIView(frame: CGRectMake(0, 0, ScreenWidth, ScreenHeight))
    self.view.addSubview(gameView)
    controller.gameView = gameView

Answer 1

取出 self.nextButton.alpha = 0 来测试一下，我相信当 alpha 为零时按钮事件不会触发。在动画方面，实际对象的 alpha 将在动画开始之前设置为零，您所看到的就像是动画时 View 的渲染交互式屏幕截图

如果是这种情况，那么您需要将 alpha 设置为类似 0.0100000003 或覆盖按钮以在 alpha 0 处进行交互