在一個view類裏面獲取viewcontroller

- (UIViewController *)viewController {

    for (UIView* next = [selfsuperview]; next; next = next.superview) {

        UIResponder *nextResponder = [next nextResponder];

        if ([nextResponder isKindOfClass:[UIViewControllerclass]])

        {

            return (UIViewController *)nextResponder;

        }

    }

    returnnil;

}