三种解决办法:
1.写个工具类，判断处理每个字段是不是[NSNull null]对象；
2.AFNetworking网络请求,设置removesKeysWithNullValues以下变量为YES：
// AFURLResponseSerialization.h
/**
Whether to remove keys with `NSNull` values from response JSON.
Defaults to `NO`.
*/
@property (nonatomic, assign) BOOL removesKeysWithNullValues;
网络请求中:
AFHTTPSessionManager * manager = [AFHTTPSessionManager manager];
AFJSONResponseSerializer *response = [AFJSONResponseSerializer serializer];
response.removesKeysWithNullValues = YES;
manager.responseSerializer = response;
3.使用大神nicklockwood写的 NullSafe：
https://github.com/nicklockwood/NullSafe
参考:
DonnyDN的
https://blog.csdn.net/DonnyDN/article/details/78226050
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