How to bring a subview to the front of a UIView
UIKit draws views back to front, which means that views higher up the stack are drawn on top of those lower down. If you want to bring a subview to the front, there's a method just for you: bringSubview(toFront:). Here's an example:
parentView.bringSubview(toFront: childView)This method can also be used to bring any subview to the front, even if you're not sure where it is:
childView.superview?.bringSubview(toFront: childView)Available from iOS 2.0
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