Question

我试图在触发函数时隐藏子视图中的UIButton。我有这种层次结构的多个视图：

  var takePhotoButton : UIButton = UIButton.buttonWithType(UIButtonType.System) as UIButton

        takePhotoButton.addTarget(self, action:"takePhoto", forControlEvents:UIControlEvents.TouchUpInside)


        var savePhotoButton : UIButton = UIButton.buttonWithType(UIButtonType.System) as UIButton


        let view2:UIView = UIView(frame: CGRectMake(0, 0, 320, 568))


        self.view.addSubview(photoMask)
        photoMask.addSubview(view2)
        view2.addSubview(takePhotoButton)

我想在触发以下func时隐藏takePhotoButton，我该怎么做？

     func takePhoto(takePhotoButton: UIButton!) {
   takePhotoButton.hidden = true
   }

Answer 1

如果要保留对它的引用，则必须使UIButton成为该类的属性。然后，您可以使用self.takePhotoButton访问它。

Answer 2

在添加目标时使用takePhoto：作为选择器，调用方法时将传递按钮。

 var takePhotoButton : UIButton = UIButton.buttonWithType(UIButtonType.System) as UIButton
 takePhotoButton.addTarget(self, action:"takePhoto:", forControlEvents:UIControlEvents.TouchUpInside)
 var savePhotoButton : UIButton = UIButton.buttonWithType(UIButtonType.System) as UIButton
 let view2:UIView = UIView(frame: CGRectMake(0, 0, 320, 568))
 self.view.addSubview(photoMask)
 photoMask.addSubview(view2)
 view2.addSubview(takePhotoButton)

然后，隐藏方法中的按钮，

func takePhoto(takePhotoButton: UIButton!) {
  takePhotoButton.hidden = true
}

Answer 3

在Swift 3.0中

，您需要使用isHidden而不是hidden

subview.isHidden = true

特别是在这种情况下，

self.subview.isHidden = true

Answer 4

制作按钮的参考变量。由此将其隐藏属性设置为true。

self.yourReferenceVariable.hidden = true

Swift：隐藏子视图中的按钮

4 个答案: