NSInvalidArgumentException : 不支持多次推送同一个视图控制器实例 [英] NSInvalidArgumentException :Pushing the same view controller instance more than once is not supported

问题描述

应用因此错误而崩溃

NSInvalidArgumentException :Pushing the same view controller instance more than once is not supported 

尝试从另一个导航控制器的 UIBarButtonItem 推送另一个导航控制器时出现此错误.

Getting this error when trying to push another navigationcontroller from another navigation controller's UIBarButtonItem.

控制台显示消息:

UINavigationController pushViewController:transition:forceImmediate:]_block_invoke + 0

这是转场编码

else if ([segue.identifier isEqualToString:@"showGroupView"]) {
        GroupView *groupView  = (GroupView *)segue.destinationViewController;

        [self.navigationController pushViewController:groupView animated:YES];
}

如果有人可以帮助解决此错误

If anyone can help resolve this error

推荐答案

好吧，这是我如何检查我的视图控制器是否在导航堆栈上但这实际上解决了我的问题

Well this i how i checked if my view controller is on the navigation stack or not but that actually solved my problem

if ([[self.navigationController topViewController] isKindOfClass:[groupView class]]){
          self.navigationController.navigationBarHidden = YES;
      }else{
          self.navigationController.navigationBarHidden = NO;
      }

所以整个代码都是这样的，供任何人参考

So the whole code goes like this for anyone reference though

else if ([segue.identifier isEqualToString:@"showGroupView"]) {
          GroupView *groupView  = (GroupView *)segue.destinationViewController;
      if ([[self.navigationController topViewController] isKindOfClass:[groupView class]]){
          self.navigationController.navigationBarHidden = YES;
      }else{
          self.navigationController.navigationBarHidden = NO;
      }
      NSLog(@"showGroupViewsegued");

  }

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