“发送到实例的无法识别的选择器”错误 [英] "Unrecognized selector sent to instance" error

问题描述

我的AppDelegate代码的一部分是：

Part of my AppDelegate code is:

UITabBarController *tabBarController 
    = (UITabBarController *)self.window.rootViewController;

UINavigationController *navigationController 
    = [[tabBarController viewControllers] objectAtIndex:0];

PilotosViewController *playersViewController 
    = [[navigationController viewControllers] objectAtIndex:0];

playersViewController.drivers = players;

但是我得到了这个例外：

But I get this exception:

- [UIViewController viewControllers] ：无法识别的选择器发送到实例0x6a75770

*** 终止应用程序由于未捕获的异常'NSInvalidArgumentException'，原因：' - [UIViewController
viewControllers]：无法识别的选择器发送到实例0x6a75770'

-[UIViewController viewControllers]: unrecognized selector sent to instance 0x6a75770
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController viewControllers]: unrecognized selector sent to instance 0x6a75770'

错误在哪里？

推荐答案

我遇到了同样的问题，因为我按照作者的步骤，但是

I met the same issue, because I followed the steps by the author, but

UINavigationController *navigationController 
    = [[tabBarController viewControllers] objectAtIndex:0];

这是导致崩溃的原因，因为 navigationController 不在 index = 0 ，
我确实交换了两个标签栏项目的位置，然后就可以了。

this is what which made the crash, because navigationController is not at index=0, I did exchange the locations of the two tab bar items, then it works.

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