superview

I noticed that I can place subview outside of superview's bound (either partly or fully). I wonder if that's acceptable, since it seems to be abnormal in usual iphone view programming. Thank you. This is acceptable and sometimes even common practice - custom implementations of scroll views or other "composite" views, for example, commonly place or move objects outside the superview's bounds. You may be interested in the UIView property clipsToBounds , which restricts subview drawing to only the bounds of the superview. Also note that out of bounds sub views pose a problem when implementing

I'm trying to implement a UIView that can be dragged out of its superview. I tried adding a UIPanGestureRecognizer to the view I want to be able to drag. It seems, however, that removing the UIView from its superview and adding it to another view, is breaking the gesture recognizer. With the code within the UIGestureRecognizerStateBegan commented out, the code within the other two blocks functions correctly, but when I reinstate it, the UIGestureRecognizerStateChanged and UIGestureRecognizerStateEnded states are never achieved. What is going wrong? if ([gr state] ==

I guess I'm struggling with generics. I want to create simple UIView extension to find recursively a superview of class passed in the function param. I want the function to return optional containing obviously either nil, or object visible as instance of provided class. extension UIView { func superviewOfClass<T>(ofClass: T.Type) -> T? { var currentView: UIView? = self while currentView != nil { if currentView is T { break } else { currentView = currentView?.superview } } return currentView as? T } } Any help much appreciated. Swift 3/4 This is a more concise way: extension UIView { func