如何将 JSON 字符串反序列化为 NSDictionary?(适用于 iOS 5+) [英] How do I deserialize a JSON string into an NSDictionary? (For iOS 5+)

问题描述

在我的 iOS 5 应用程序中，我有一个包含 JSON 字符串的 NSString.我想将该 JSON 字符串表示反序列化为本机 NSDictionary 对象.

In my iOS 5 app, I have an NSString that contains a JSON string. I would like to deserialize that JSON string representation into a native NSDictionary object.

 "{"password" : "1234",  "user" : "andreas"}"

我尝试了以下方法:

NSDictionary *json = [NSJSONSerialization JSONObjectWithData:@"{"2":"3"}"
                                options:NSJSONReadingMutableContainers
                                  error:&e];  

但它会引发运行时错误.我做错了什么?

-[__NSCFConstantString bytes]: unrecognized selector sent to instance 0x1372c 
*** Terminating app due to uncaught exception 'NSInvalidArgumentException',
reason: '-[__NSCFConstantString bytes]: unrecognized selector sent to instance 0x1372c'

推荐答案

看起来你正在传递一个 NSString 参数，而你应该传递一个 NSData 参数:

It looks like you are passing an NSString parameter where you should be passing an NSData parameter:

NSError *jsonError;
NSData *objectData = [@"{"2":"3"}" dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:objectData
                                      options:NSJSONReadingMutableContainers 
                                        error:&jsonError];

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