如何使用 iPhone 中的密钥从 JSON 中获取数据

Question

嘿，我是iPhone 的新手，我一直在尝试解析下面的JSON，以使用下面的代码显示不同类型的Survey。我有两个表，在第一个表中我想显示所有 "Surveys_title" 文本值，一旦用户点击任何调查标题行，它应该在我的第二个表中显示他们特定的 question 和 question ID。就像我对"Survey1" 有两个问题，对"Survey2" 有三个问题。使用我的代码，我可以在我的第一个表中显示所有survey titles，但我遇到了如何单独存储所有调查类型的对象数组的问题。在这里，我创建了一个自定义类"Survey"。谢谢你能给我的任何帮助。

JSON：

{
    "Surveys": [
        {
            "Surveys_title": "Survey1",
            "Questions": [
                {
                    "event_sq_qns_id": 1,
                    "questions": "What is your primary job title/focus?"
                },
                {
                    "event_sq_qns_id": 2,
                    "questions": "Effectiveness of the speakers?"
                }
            ]
        },
        {
            "Surveys_title": "Survey2",
            "Questions": [
                {
                    "event_sq_qns_id": 3,
                    "questions": "What is this?"
                },
                {
                    "event_sq_qns_id": 4,
                    "questions": "Who are you?"
                },
                {
                    "event_sq_qns_id": 5,
                    "questions": "what is your name?"
                }
            ]
        },
        {
            "Surveys_title": "Survey3",
            "Questions": [
                {
                    "event_sq_qns_id": 6,
                    "questions": "What is your primary job?"
                },
                {
                    "event_sq_qns_id": 7,
                    "questions": "Effectiveness of the speakers?"
                }
            ]
        }
    ]
}

这是我的代码：

#import <Foundation/Foundation.h>

@interface Surveys : NSObject

@property (nonatomic, retain) NSString *surveys_question_id;
@property (nonatomic, retain) NSString *questions;

@end


- (void) fetchingSurveyQuestionsFromServer
{
    [MBProgressHUD showHUDAddedTo:self.view animated:YES];

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
        NSDictionary *results;
        @try {

            NSString *filePath = [[NSBundle mainBundle] pathForResource:@"survey" ofType:@"json"];
            NSData *responseData = [NSData dataWithContentsOfFile:filePath];

            //parse the json data
            NSError *error;
            NSDictionary* json = [NSJSONSerialization JSONObjectWithData:responseData
                                                                 options:kNilOptions
                                                                   error:&error];

            results= [json objectForKey:@"Surveys"];
        }
        @catch (NSException *exception) {
            NSLog(@"Exception in %s %@",__FUNCTION__,exception);

        }
        dispatch_async (dispatch_get_main_queue (),
                        ^{
                            arraySurveys = [[NSMutableArray alloc] init];
                            arraySurveys_type = [[NSMutableArray alloc] init];
                            NSString *surveys_title_name;

                            for (NSDictionary *dict in results) {
                                NSDictionary *questionDict = dict[@"Questions"];
                                surveys_title_name = dict[@"Surveys_title"];

                                NSLog(@"Questions dictionary = %@", questionDict);
                                NSLog(@"Survey type is = %@", surveys_title_name);

                                for (NSDictionary *dict1 in questionDict) {
                                    Surveys *surveys = [[Surveys alloc] init];

                                    surveys.surveys_question_id = [dict1 objectForKey:@"event_sq_qns_id"];
                                    surveys.questions = [dict1 objectForKey:@"survey_questions"];

                                    [arraySurveys addObject:surveys];
                                }
                                [arraySurveys_type addObject:surveys_title_name];
                            }

                            [MBProgressHUD hideHUDForView:self.view animated:YES];
                            [tblSurveys reloadData];
                        });
    });
}

使用上面的代码，所有问题都直接添加到arraySurveys。请帮助我如何根据调查标题进行区分。

谢谢。

Answer 1

这样使用....

 SBJSON *json = [[SBJSON alloc] init];
 NSMutableDictionary *jsonObject = [json objectWithString:response ];
 NSMutableArray *Surveys=[jsonObject valueForKey:@"Surveys"];
 NSMutableArray * Surveys_title =[[NSMutableArray alloc]init];
 NSMutableArray * Questions =[[NSMutableArray alloc]init];    

    for (NSDictionary *dictnory in Surveys) {
        [Surveys_title addObject:[dictnory objectForKey:@"Surveys_title"]];
        [Questions addObject:[dictnory objectForKey:@"Questions"]];

    }