从 json ios 检索数据

Posted 2023-03-16

【中文标题】从 json ios 检索数据

【英文标题】：Retrieve a data from json ios

【发布时间】：2016-06-13 10:24:17

【问题描述】：

这是字典*data的内容

 Data =     
        Specialities =         (
                        
                ApprovalStatus = Unapproved;
                CurrencyCode = "<null>";
                Packages = "<null>";
                Photos = "<null>";
                ServiceDescription = 356563;
                Speciality = 22;
                SpecialityName = "Wedding Photographer";
                UserFRPs = "<null>";
                Videos =                 (
                                        
                        VideoId = TWhSjpsGvPQ;
                        VideoLink = "http://www.youtube.com/watch?v=TWhSjpsGvPQ";
                        VideoType = YouTube;
                    ,
                                        
                        VideoId = N2CJrhHEydA;
                        VideoLink = "http://www.youtube.com/watch?v=N2CJrhHEydA";
                        VideoType = YouTube;
                    ,
                                        
                        VideoId = Lq6faQVYcwY;
                        VideoLink = "http://www.youtube.com/watch?v=Lq6faQVYcwY";
                        VideoType = YouTube;
                    ,
                                        
                        VideoId = v8WjMiodcKo;
                        VideoLink = "http://www.youtube.com/watch?v=v8WjMiodcKo";
                        VideoType = YouTube;
                    
                );
            ,
                        
                ApprovalStatus = Unapproved;
                CurrencyCode = "<null>";
                Packages = "<null>";
                Photos = "<null>";
                ServiceDescription = 52454353;
                Speciality = 37;
                SpecialityName = "Hair and Makeup Stylist";
                UserFRPs = "<null>";
                Videos = "<null>";
            ,
                        
                ApprovalStatus = Unapproved;
                CurrencyCode = "<null>";
                Packages = "<null>";
                Photos = "<null>";
                ServiceDescription = 21212;
                Speciality = 55;
                SpecialityName = Transport;
                UserFRPs = "<null>";
                Videos = "<null>";
            
        );
    ;

这是我从 json 得到的响应，我应该编写什么逻辑来检索链接到特定“Speciality”的“VideoId”（例如，Specialty = 22）

如果我编写以下代码，我会得到所有 @"VideoId"

[[[[responseDictionary valueForKey:@"Data"]valueForKey:@"Specialities"]valueForKey:@"Videos"]valueForKey:@"VideoId"]

【问题讨论】：

Specialities 是一个数组，每个索引都包含一个字典。

你可以使用 ObjectAtIndex 作为数组。

【参考方案1】：

解析方式如下：

        NSDictionary *dataDict = [responseDictionary valueForKey:@"Data"];
        NSMutableArray *specialityArray = [dataDict valueForKey:@"Specialities"];
        NSDictionary *objectDict = [specialityArray objectAtIndex:your index (0/1/2)];
        int *speciality = [[objectDict ValueForKey:@"Speciality"] intValue];
    if(speciality = 22)
    
        NSMutableArray *videoArray = [objectDict valueForKey:@"Videos"];
        NSDictionary *videoObject = [videoArray objectAtIndex:your index (0/1/2)];
        NSString     *videoID     = [videoObject valueForKey:@"VideoId"];
    

根据您的需要相应地解析其余部分。

【讨论】：

感谢 Saad 的帮助，您的代码解决了我的问题，但唯一的问题是我无法对索引进行硬编码。 NSDictionary *objectDict = [specialityArray objectAtIndex:your index (0/1/2)];

你真的想要硬编码吗？如果我们完全确定某个值及其发生，我们通常会进行硬编码。这也是一种不好的做法。

我不想硬编码 bcoz 专业 id 可能会改变，那么如何获取特定专业 id 的索引

为此，您可以遍历您的专长，如下所示：for(NSDictionary * objectDict in specialityArray) int *speciality = [[objectDict ValueForKey:@"Speciality"] intValue]; and so on.

【参考方案2】：

使用此代码，

    NSArray *wholeArray = [[responseDictionary objectForKey:@"Data"] valueForKey:@"Specialities"];
    NSArray *subArray = [[wholeArray objectAtIndex:0] valueForKey:@"Videos"];

subArray 是获取所有视频值，然后使用此代码获取单个值，

NSString  *videoID = [[subArray objectAtIndex:i] valueForKey:@"VideoId"];

或者您将在单个变量中获取所有 videoID，请使用以下代码，

NSMutableArray *tempArray = [[NSMutableArray alloc] init];
    for (int i = 0; i < subArray.count; i++) 
        [tempArray addObject:[[subArray objectAtIndex:i] valueForKey:@"VideoId"]];
    

最终 tempArray 得到所有的 VideoID 值，在你使用的任何地方，

NSString  *videoID = [tempArray objectAtIndex:0/1/2];

希望对你有帮助

【讨论】：

感谢 Iyyappan 的帮助，但我无法对索引进行编码