willMove(toSuperview:)
Tells the view that its superview is about to change to the specified superview.
Declaration
func willMove(toSuperview newSuperview: UIView?)Parameters
- newSuperview:
A view object that will be the new superview of the receiver. This object may be
nil.
Discussion
The default implementation of this method does nothing. Subclasses can override it to perform additional actions whenever the superview changes.