通过view获取控制器

通过控件获取控制器：

• (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;
  }

通过子控制器中通过self.parentViewController
通过addChildViewController来添加的控制器