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应用中，我有一个包含JSON字符串的 NSString 。我想将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：

I tried the following approach:

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？

But it throws the a runtime error. What am I doing wrong?

-[__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

看起来你传递了一个 NSString 参数，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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