ios NSMutableDictionary 到 JSON 的转换给出了错误的格式答案

【问题标题】：ios NSMutableDictionary to JSON convertion gives wrong formatios NSMutableDictionary 到 JSON 的转换给出了错误的格式
【发布时间】：2013-12-31 08:35:19
【问题描述】：

我正在尝试在 ios 上将 NSMutableDictionary 转换为 json。

NSMutableDictionary *offers = [[NSMutableDictionary alloc] init ];


    for(int i=0;i<2;i++) {
        NSMutableDictionary *myOffer = [[NSMutableDictionary alloc]init];
        [myOffer setObject:@"3" forKey:@"id"];
        [myOffer setObject:@"34" forKey:@"price"];
        [myOffer setObject:@"3" forKey:@"quantity"];
        [offers setObject:myOffer forKey:[NSString stringWithFormat:@"%i",i]];
    }

NSError *errorOffers;
    NSData *jsonDataOffers = [NSJSONSerialization dataWithJSONObject:offers
                                                                      options:0
                                                                        error:&errorOffers];
       NSString* aStrOffers;
    aStrOffers = [[NSString alloc] initWithData:jsonDataOffers encoding:NSUTF8StringEncoding];

我得到了结果。

"offers": {
            "0": {
                "id": "3",
                "quantity": "3",
                "price": "34"
            },
            "1": {
                "id": "3",
                "quantity": "3",
                "price": "34"
            }   
  }

但我需要它作为

"offers": {
           [ {
                "id": "3",
                "quantity": "3",
                "price": "34"
            },
            {
                "id": "3",
                "quantity": "3",
                "price": "34"
            }
       ] 
     }

（无索引，但方括号）请指教。

【问题讨论】：

您是否尝试过将*offers 设为NSMutableArray 而不是字典？这应该可以满足您的需求。

标签： ios iphone json nsmutabledictionary

【解决方案1】：

下面的示例完全符合您的需要。您需要一个数组而不是字典。因为字典有需要定义的键。

NSMutableArray *offers = [[NSMutableArray alloc] init];


    for(int i=0;i<2;i++) {
        NSMutableDictionary *myOffer = [[NSMutableDictionary alloc]init];
        [myOffer setObject:@"3" forKey:@"id"];
        [myOffer setObject:@"34" forKey:@"price"];
        [myOffer setObject:@"3" forKey:@"quantity"];
        [offers addObject:myOffer];
    }

    NSError *errorOffers;
    NSData *jsonDataOffers = [NSJSONSerialization dataWithJSONObject:offers
                                                             options:0
                                                               error:&errorOffers];
    NSString* aStrOffers;
    aStrOffers = [[NSString alloc] initWithData:jsonDataOffers encoding:NSUTF8StringEncoding];

【讨论】：

【解决方案2】：

这段代码对你有好处

{"jsonArray":[{"id":"3","quantity":"3","price":"34"},{"id":"3","quantity":"3","price":"34"}]}

NSMutableDictionary *offers = [[NSMutableDictionary alloc] init ];
NSMutableArray *array = [NSMutableArray array];

for(int i=0;i<2;i++) {
    NSMutableDictionary *myOffer = [[NSMutableDictionary alloc]init];
    [myOffer setObject:@"3" forKey:@"id"];
    [myOffer setObject:@"34" forKey:@"price"];
    [myOffer setObject:@"3" forKey:@"quantity"];
    [array addObject:myOffer];
}
[offers setObject:array forKey:@"jsonArray"];

NSError *errorOffers;
NSData *jsonDataOffers = [NSJSONSerialization dataWithJSONObject:offers
                                                         options:0
                                                           error:&errorOffers];
NSString* aStrOffers;
aStrOffers = [[NSString alloc] initWithData:jsonDataOffers encoding:NSUTF8StringEncoding];
NSLog(@"%@",aStrOffers);

【讨论】：

【解决方案3】：

NSMutableDictionary *offers = [[NSMutableDictionary alloc] init ];
NSMutableArray *offerDetails = [[NSMutableArray alloc] init];

for(int i=0;i<2;i++) {
    NSMutableDictionary *myOffer = [[NSMutableDictionary alloc]init];
    [myOffer setObject:@"3" forKey:@"id"];
    [myOffer setObject:@"34" forKey:@"price"];
    [myOffer setObject:@"3" forKey:@"quantity"];
    [offerDetails addObject:myOffer];
}

[offers setObject:offerDetails forKey:@"offers"];

NSError *errorOffers;
NSData *jsonDataOffers = [NSJSONSerialization dataWithJSONObject:offers
                                                         options:0
                                                           error:&errorOffers];
NSString* aStrOffers;
aStrOffers = [[NSString alloc] initWithData:jsonDataOffers encoding:NSUTF8StringEncoding];
NSLog(@"%@", aStrOffers);

【讨论】：

【解决方案4】：

您需要先将数据设置为NSDictionary，然后将其设置为NSMutableArray，并将array 用于NSJSonSerialization，然后您将获得预期的输出。

[....] --> 表示 NSArray 对象。

{.....} --> 表示 NSDictionary 对象。

【讨论】：