查找离自己最近的vc

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/**
 *  查找离自己最近的一个父类vc(viewController)
 *
 *  @return 找到的vc
 */
- (UIViewController *)viewController {
  for (UIView *next = self.view.superview; next; next = next.superview) {
    UIResponder *nextResponder = [next nextResponder];
    if ([nextResponder isKindOfClass:[UIViewController class]]) {
      return (UIViewController *)nextResponder;
    }
  }
  return nil;
}