按钮不会取消隐藏

Question

我可以让我的按钮隐藏，但不隐藏。

我隐藏用自来水的answerOneCover按钮：

@IBAction func answerOneCoverTapped(_ sender: Any) { 
    animateButtonCoverOut(button: answerOneCover) 
} 

func animateButtonCoverOut(button: UIButton) { 

    UIView.animate(withDuration: 1.0, delay: 0.1, options: 
     UIViewAnimationOptions.curveEaseOut, animations: { 
      button.alpha = 0 
    }, completion: { finished in 
     button.isHidden = true 
    }) 
} 

我尝试取消隐藏answerOneCover按钮时不同的按钮，answerOneButtonText按钮被窃听：

@IBAction func answerOneButtonTextTapped(_ sender: Any) { 
    answerOneCover.isHidden = false 
} 

但我无法取得answerOneCover的取消隐藏。有没有办法做到这一点，我错过了？

Answer 1

你必须设置按钮阿尔法回到。改变你的代码看起来像这样：

@IBAction func answerOneButtonTextTapped(_ sender: Any) { 
    answerOneCover.alpha = 1 
    answerOneCover.isHidden = false 
} 

OR，你可以把它放在你的动画完成，像这样：

func animateButtonCoverOut(button: UIButton) { 

    UIView.animate(withDuration: 1.0, delay: 0.1, options: 
     UIViewAnimationOptions.curveEaseOut, animations: { 
      button.alpha = 0 
    }, completion: { finished in 
     button.isHidden = true 
     button.alpha = 1 
    }) 
}