ios - 如何在 Swift 中切换可见性 GONE 和 VISIBLE

Question

我想在可见性 GONE 和 VISIBLE 之间切换。这在 Android 开发中很容易实现，但我不知道如何在 Swift

中使用相同的方法

我尝试使用此代码将标签设置为已消失:

// set the width constraint to 0
let widthConstraint = NSLayoutConstraint(item:  self.labelShortDescription, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1, constant: 0)
self.labelShortDescription.addConstraint(widthConstraint)

// set the height constraint to 0
let heightConstraint = NSLayoutConstraint(item:  self.labelShortDescription, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1, constant: 0)
self.labelShortDescription.addConstraint(heightConstraint)

Answer 1

隐形:

This view is invisible, but it still takes up space for layout purposes.

要在 iOS 中实现这一点:

yourView.alpha = 0

消失了:

This view is invisible, and it doesn't take any space for layout purposes.

要在 iOS 中实现这一点:

yourView.removeFromSuperview()