得到一个view 所在的控制器(viewController)

- (UIViewController*)viewController {

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

UIResponder *nextResponder = [next nextResponder];

if
([nextResponder isKindOfClass:[UIViewController class]]) {

return (UIViewController*)nextResponder;

}

}

return nil;

}