ios - 在 Objective C 中处理 NSMutableArray 中的集合数据

Question

我从“WebServices”获取“JSON数据”并将它们设置在NSMutableArray中并尝试在页面中显示，我根据“JSON数据”使用“4个键”但是我不知道如何使用“键值”从 NSMutableArray 获取特定数据，我的“JSON`数据”是这样的 -

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JSON 数组格式 收件箱 X 阿努吉贾

晚上 9:13(14 小时前)

对我来说，Gaurav，RAjeev

<__NSArrayM 0x7f9e42556c10>(

{

    ansDesc = "Researching a lead that I previously submitted ";

    ansId = 1;

    qsDesc = "What is your primary goal for visiting the portal, today? ";

    qsId = 1;

},

{

    ansDesc = "Submitting a new lead ";

    ansId = 2;

    qsDesc = "What is your primary goal for visiting the portal, today? ";

    qsId = 1;

},

{

    ansDesc = "Working on a draft lead ";

    ansId = 3;

    qsDesc = "What is your primary goal for visiting the portal, today? ";

    qsId = 1;

},

{

    ansDesc = "Daily ";

    ansId = 4;

    qsDesc = "How often do you use the Target Revenue Portal? ";

    qsId = 2;

},

{

    ansDesc = "Several times a week ";

    ansId = 5;

    qsDesc = "How often do you use the Target Revenue Portal? ";

    qsId = 2;

},

{

    ansDesc = "Once a week ";

    ansId = 6;

    qsDesc = "How often do you use the Target Revenue Portal? ";

    qsId = 2;

},

{

    ansDesc = "Every couple of weeks ";

    ansId = 7;

    qsDesc = "How often do you use the Target Revenue Portal? ";

    qsId = 2;

},

{

    ansDesc = "About once a month ";

    ansId = 8;

    qsDesc = "How often do you use the Target Revenue Portal? ";

    qsId = 2;

},

我必须在页面中一起显示“qsId 1”和“ansId 1, 2, 3”的一组问题和相应答案，然后类似地显示“qsId 2”和“ansId 4,5,6,7” ,8”在下一页。请帮我找出最可行的方法。

谢谢

Answer 1

在 Objective C 中，NSMutableArray 不支持键值概念。 NSDictionary 确实支持它。

我认为更好的方法是使用模型类来保存四个属性并使用 NSPredicate 将它们过滤掉。

@interface JSON_Info : NSObject

//id's
@property (nonatomic, assign) int qsId;
@property (nonatomic, assign) int ansId;

//descriptions
@property (nonatomic, strong) NSString *qsDesc;
@property (nonatomic, strong) NSString *ansDesc; 

@end

如果要过滤，请使用NSPredicate

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"qsId == 1 && ansId == 2"];
NSArray *filteredCollection = [self.JSONInfoCollection filteredArrayUsingPredicate: predicate];