将 NSString 转换为 NSDictionary/JSON

我将以下数据保存为 NSString:

 {
Key = ID;
Value =         {
Content = 268;
Type = Text;
};
},
{
Key = ContractTemplateId;
Value =         {
Content = 65;
Type = Text;
};
},

我想把这个数据转换成一个包含键值对的 NSDictionary。

我首先尝试将 NSString转换为 JSON对象，如下所示:

 NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

然而，当我尝试:

NSString * test = [json objectForKey:@"ID"];
NSLog(@"TEST IS %@", test);

我收到的值为 NULL。

有人能告诉我问题出在哪里吗？

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小开

Use this code where str is your JSON string:

NSError *err = nil;
NSArray *arr =
[NSJSONSerialization JSONObjectWithData:[str dataUsingEncoding:NSUTF8StringEncoding]
options:NSJSONReadingMutableContainers
error:&err];
// access the dictionaries
NSMutableDictionary *dict = arr[0];
for (NSMutableDictionary *dictionary in arr) {
// do something using dictionary
}
小开

I think you get the array from response so you have to assign response to array.

NSError *err = nil;
NSArray *array = [NSJSONSerialization JSONObjectWithData:[string dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingMutableContainers error:&err];
NSDictionary *dictionary = [array objectAtIndex:0];
NSString *test = [dictionary objectForKey:@"ID"];
NSLog(@"Test is %@",test);
小开
最佳答案

I believe you are misinterpreting the JSON format for key values. You should store your string as 

NSString *jsonString = @"{\"ID\":{\"Content\":268,\"type\":\"text\"},\"ContractTemplateID\":{\"Content\":65,\"type\":\"text\"}}";
NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

Now if you do following NSLog statement 

NSLog(@"%@",[json objectForKey:@"ID"]);

Result would be another NSDictionary.

{
Content = 268;
type = text;
}

Hope this helps to get clear understanding.

小开

Use the following code to get the response object from the AFHTTPSessionManager failure block; then you can convert the generic type into the required data type:

id responseObject = [NSJSONSerialization JSONObjectWithData:(NSData *)error.userInfo[AFNetworkingOperationFailingURLResponseDataErrorKey] options:0 error:nil];
小开

Swift 3:

if let jsonString = styleDictionary as? String {
let objectData = jsonString.data(using: String.Encoding.utf8)
do {
let json = try JSONSerialization.jsonObject(with: objectData!, options: JSONSerialization.ReadingOptions.mutableContainers)
print(String(describing: json))


} catch {
// Handle error
print(error)
}
}

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