“不支持多次推送相同的视图控制器实例”例外

问题描述

我使用以下代码检索一些邮件并将它们放入我的收件箱。

I am using the following code to retrieve some messages and putting them into my inbox.

MyInboxVC *inboxVC=[MyInboxVC get ];
//upload all the pending messages
UINavigationController *devNavController=[[MyappMgr get]getDeveloperNavigationController ];

[devNavController pushViewController:inboxVC animated:YES];
[devNavController setNavigationBarHidden:NO];

我得到例外

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Pushing the same view controller instance more than once is not supported (<MyInboxVC: 0x1452a0>)'

这是什么意思？我做错了什么？

What does it mean? What am I doing wrong?

推荐答案

我相信当你做一些非常快的动作时，这也会发生。我用这样的东西构建：

I believe when you do some actions really fast this can happens too. I build something in like this:

if(![self.navigationController.topViewController isKindOfClass:[YOURCLASS class]]) {

编辑//

这种情况经常发生在具有慢动画的旧设备上，例如iphone 3或3gs

this happens more often on old devices with slow animations, like the iphone 3 or 3gs

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