问题描述
我正在将支持ios 5的项目转换为ios 4并遇到一些困难。
它使用类 AFNetworking ，我的问题在以下行：
I'm converting a project that supports ios 5 to ios 4 and having some difficulties.It uses the class AFNetworking and my problem is in the following line:
iOS 5 :(效果很好）
iOS 5: (works great)
self.responseJSON =[NSJSONSerialization JSONObjectWithData:self.responseData options:0 error:&error];
因为iOS不支持 NSJSONSerialization 4我正在使用它：
Because NSJSONSerialization isn't supported in iOS 4 I'm using this:
self.responseJSON = AFJSONDecode(self.responseData, &error);
什么给我错误：
Undefined symbols for architecture i386:
"_AFJSONDecode", referenced from:
-[AFJSONRequestOperation responseJSON] in AFJSONRequestOperation.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
推荐答案
AFNetworking页面的状态：
The Requirements section of the AFNetworking page states:
浏览，我看到文件，似乎可以处理JSON解码。这在AFNetowrking的最新版本中不存在，因为它需要具有NSJSONSerialization的iOS 5或更高版本。
Glancing at the code for version 0.10.1, I see the file AFJSONUtilities.m, which appears to handle JSON decoding. This is not present in the latest version of AFNetowrking since it requires iOS 5 or above, which has NSJSONSerialization.
您可能想要尝试版本0.10.1，如果您有还没有，而不是修改当前版本在iOS 4上工作，因为在处理JSON问题后你可能会遇到额外的障碍。
You might want to try version 0.10.1, if you have not already, rather than modifying the current version to work on iOS 4 because you may run into additional roadblocks after dealing with the JSON problem.
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