//獲取View的ViewController

• (UIViewController )viewController {
  //便利
  for (UIView next = [self superview]; next; next = next.superview) {
  //響應(yīng)者鏈
  UIResponder *nextResponder = [next nextResponder];
  //判斷View所述的ViewController
  if ([nextResponder isKindOfClass:[UIViewController class]]) {
  return (UIViewController *)nextResponder;
  }
  }
  return nil;
  }

原理:
通過 便利 響應(yīng)者鏈 判斷 是否是該 View 的VIewControll