Check if a subview is in a view using Swift

Question

How do I test if a subview has already been added to a parent view? If it hasn't been added, I want to add it. Otherwise, I want to remove it.

Answer 1

You can use the UIView method isDescendantOfView:

if mySubview.isDescendant(of: someParentView) {     mySubview.removeFromSuperview() } else {     someParentView.addSubview(mySubview) } 

You may also need to surround everything with if mySubview != nil depending on your implementation.

Answer 2

This is a much cleaner way to do it:

if myView != nil { // Make sure the view exists          if self.view.subviews.contains(myView) {             self.myView.removeFromSuperview() // Remove it         } else {            // Do Nothing         }     } }