Question

我正在尝试使用foursquare api来附近的地方。这是从

返回的json数据

 NSDictionary *results = [jsonString JSONValue];
 NSLog(@"%@", results);
(
        {
        code = 200;
        errorDetail = "This endpoint will stop returning groups in the future. Please use a current version, see http://bit.ly/lZx3NU.";
        errorType = deprecated;
    },
        {
        groups =         (
                        {
                items =                 (
                                        {
                        categories =                         (
                                                        {
                                icon = "https://foursquare.com/img/categories/parks_outdoors/default.png";
                                id = 4bf58dd8d48988d163941735;
                                name = Park;
                                parents =                                 (
                                    "Great Outdoors"
                                );
                                pluralName = Parks;
                                primary = 1;
                                shortName = Park;
                            }
                        );

然后我尝试使用

获取数组中的组列表

NSArray *groups = [ (NSDictionary *)results objectForKey:@"groups"];

返回以下错误

2011-11-05 11:42:12.907 XperienzApp[1972:207] No of results returned: 0 Results : (null)
2011-11-05 11:42:13.225 XperienzApp[1972:207] -JSONValue failed. Error trace is: (
    "Error Domain=org.brautaset.JSON.ErrorDomain Code=3 \"Unrecognised leading character\" UserInfo=0x5849cd0 {NSLocalizedDescription=Unrecognised leading character}"
)
2011-11-05 11:42:13.225 XperienzApp[1972:207] No of results returned: 0 Results : (null)

我应该如何解析这个？

编辑：我尝试了建议的技术，这给了我一个数组

id groups = [[(NSDictionary *)results objectForKey:@"response"] objectForKey:@"groups"];

    if ([results count] > 1){
        NSLog(@"groups class %@\ngroups %@ %d", groups, [groups class], [groups count]);

日志输出格式为：

 {
                categories =                 (
                                        {
                        icon = "https://foursquare.com/img/categories/nightlife/danceparty.png";
                        id = 4bf58dd8d48988d11f941735;
                        name = Nightclub;
                        parents =                         (
                            "Nightlife Spots"
                        );
                        pluralName = Nightclubs;
                        primary = 1;
                        shortName = Nightclub;
                    }
                );
                contact =                 {
                };
                hereNow =                 {
                    count = 0;
                };
                id = 4eb33ba561af0dda8f673c1b;
                location =                 {
                    address = "144 Willow St 4R";
                    city = Brooklyn;
                    crossStreet = Pierrepont;
                    distance = 462;
                    lat = "40.696864";
                    lng = "-73.996409";
                    postalCode = 11201;
                    state = NY;
                };
                name = "Entertainment 720, Ltd.";
                stats =                 {
                    checkinsCount = 3;
                    tipCount = 0;
                    usersCount = 1;
                };
                verified = 0;
            }
        );
        name = Nearby;
        type = nearby;
    }
)
groups __NSArrayM 1

这也不是json并且难以解析，我如何在json中获取输出。

Answer 1

我是foursquare上的iPhone主角。我会试着去试试这里发生的事情。

首先，我强烈建议您使用JSONKit作为解析器。它重量轻，速度极快：https://github.com/johnezang/JSONKit

您似乎正在正确解析JSON并正确获取字典。然后，您将记录解析的对象，而不是原始的JSON。您看到的输出是Objective-C如何选择将已解析的字典序列化为文本。绝对不是JSON。使用JSONKit，您可以将JSONString选择器发送到您的解析结果并将其转换回JSON并记录它。

如果您可以提供有关您要解决的问题的一些详细信息，我可以帮助您解决更多问题。正如Maudicus所说，请注意你要回来的错误。当我们对API进行更改时，您不希望您的应用中断。

Answer 2

如果NSLog(@"%@", results);以下的输出是您的日志语句。看来你的结果变量是一个字典对象数组。

尝试记录结果类以验证NSLog(@"%@", [results class]);

如果是数组，则groups对象是第二个对象。

if ([results count] > 1)
id groups = [results objectAtIndex:1];
NSLog(@"groups class %@\ngroups %@", [groups class], groups);

在您了解数据格式之前，请继续这样做

也是行

errorDetail = "This endpoint will stop returning groups in the future. Please use a current version, see http://bit.ly/lZx3NU.";

应引起关注。查看foursquare上的文档，了解当前获取组的方式。

解析由foursquare为iPhone返回的json给出了无法识别的主角

2 个答案: