ios - Swift:添加 subview 后背景消失

Question

我有一个 GameOver 类，它显示背景颜色和一个播放按钮。添加“view.addSubview(self.playAgainButton)”后，背景色弹出并突然从屏幕上消失。再次播放按钮仍然存在。

如果我删除 addSubview 调用，背景颜色会保留在那里。

谁能帮帮我？

class GameOver: SKScene{
  var playAgainButton = UIButton()
  var playAgainButtonImage = UIImage(named: "PlayAgainButton")

  override func didMoveToView(view: SKView) {
     backgroundColor = UIColor.redColor()

     self.playAgainButton = UIButton(type: UIButtonType.Custom)
     self.playAgainButton = setImage(playAgainButtonImage, forState: .Normal)
     self.playAgainButton.frame = CGRectMake(self.frame.size.width / 2, self.frame.size.height / 2, 190, 70)
     self.playAgainButton.layer.anchorPoint = CGPointMake(1.0, 1.0)
     self.playAgainButton.layer.zPosition = 0

     // If I add this line -> backgroundcolor disappears
     view.addSubview(self.playAgainButton)

  }
}

我的 GameScene gameOver 函数看起来像这样(也许有错误？)

func gameOver() {
   let skView = self.view! as SKView
   skView.ignoresSiblingOrder = true

   self.scene?.removeFromParent()

   let transition = SKTransition.fadeWithColor(UIColor.grayColor(), duration: 1.0)
   transition.pausesOutgoingScene = false

   var scene: GameOver!
   scene = GameOver(size: skView.bounds.size)

   scene.scaleMode = .AspectFill

   skView.presentScene(scene, transition: transition)
}

Answer 1

你必须将 subview 添加到父 View

改变

view.addSubview(self.playAgainButton)

到

view.superview?.addSubview(self.playAgainButton)

解决问题