Crash处理 -[AFHTTPResponseSerializ

在开发中，如遇到类似的崩溃情况，可以参考尝试以下解决方法

崩溃情况

-[AFHTTPResponseSerializer validateResponse:data:error:] (AFURLResponseSerialization.m:) 
-[AFJSONResponseSerializer responseObjectForResponse:data:error:] (AFURLResponseSerialization.m) 
[AFURLSessionManagerTaskDelegate URLSession:task:didCompleteWithError:]_block_invoke_2.108 (AFURLSessionManager.m) 

解决办法

这个问题和AFNetworking无关，当我们使用单例封装时，我们应该锁定 requestSerializer 和 responseSerializer 而不是延迟加载。

- (AFJSONResponseSerializer *)afJSONResponseSerializer {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _afJSONResponseSerializer = [AFJSONResponseSerializer serializer];
    });
    return _afJSONResponseSerializer;
}

- (AFJSONRequestSerializer *)afJSONRequestSerializer {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _afJSONRequestSerializer = [AFJSONRequestSerializer serializer];
    });
    return _afJSONRequestSerializer;
}

参考：https://github.com/AFNetworking/AFNetworking/issues/4591