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UIView implements this method by returning the UIViewController object that manages it (if it has one) or its superview (if it doesn’t); UIViewController implements the method by returning its view’s superview; UIWindow returns the application object, and UIApplication returns nil.
id next = [self nextResponder]; while(![next isKindOfClass:[ViewController class]]) { next = [next nextResponder]; } if ([next isKindOfClass:[ViewController class]]) { controller = (ViewController *)next; }