objectForKeyedSubscript：在iOS 5.1上崩溃 [英] objectForKeyedSubscript: crash on iOS 5.1

问题描述

我正在运行一些执行[NSDictionary objectForKeyedSubscript：]的代码，它在iOS 5上崩溃，但不在iOS 6上崩溃。我正在使用xcode 4.5.2并针对iOS 6.0 SDK进行编译。

I'm running some code that does a [NSDictionary objectForKeyedSubscript:] and it's crashing on iOS 5, but not iOS 6. I am using xcode 4.5.2 and compiling against the iOS 6.0 SDK.

我认为这可以在iOS 5上运行，因为它只是一个编译器功能？我错了吗？我可以自己编写这些函数的版本，但是我担心其他错误，因为我希望它可以工作。

I assumed that this would work on iOS 5 since it's just a compiler feature? Am I wrong about that? I can just write my own versions of those functions, but I'm worried that something else is wrong since I would expect it to work.

推荐答案

好的，我会回答我自己的问题，虽然我不完全理解为什么会失败。

OK, I'm going to answer my own questions, although I don't completely understand why it was failing.

使用 objectForKeyedSubscript：等在iOS 5中运行良好（只要它是针对iOS 6 SDK编译的）。

Using objectForKeyedSubscript: and the like works fine running in iOS 5 (as long as it was compiled against the iOS 6 SDK).

问题是我命名了一个函数 +（void）load 并且在此函数中调用 objectForKeyedSubscript：会因为该方法而导致断言没找到。

The problem was I named a function +(void)load and making objectForKeyedSubscript: calls in this function causes an assert due to the method not being found.

这是我的命名错误，因为在App完全运行之前调用了load方法。我已经更改了我的函数的名称，一切都很好。

This was an naming error on my part because the load method is called before the App is fully running. I have changed the name of my function and all is well.

我假设在完全插入NSDictionary之前调用了+ load。奇怪的是，它在iOS 6下工作，而不是iOS 5。

I assume +load is being called before something with NSDictionary is fully inited. Odd that it works under iOS 6 and just not iOS 5.

也许这不奇怪。

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