iOS 判断是push还是present

iOS 判断是push还是present下面这种方法判断成功了
 if (self.presentingViewController)
  {
     [weakSelf dismissViewControllerAnimated:YES completion:nil];
   } 
  else {
      [weakSelf.navigationController popViewControllerAnimated:YES];      }

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原文：http://smengxiang.blog.51cto.com/11204872/1893460