如何在Objective-C中创建JSON对象？

Question

我有如下所示的javascript DTO。 使用下面给出的params = DTO列表转换为json对象的结构是什么， 应该在Objective-c中找到？

如何基于此构造JSON对象？

private List<Long> sizes=new ArrayList<Long>();
private List<Long> colors=new ArrayList<Long>();
private List<Long> styles=new ArrayList<Long>();
private List<String> gender=new ArrayList<String>();
private List<Long> brands=new ArrayList<Long>();
private Long vendor;
private String vendorName;
private Boolean isNewArrival=false;
private Boolean isSort=false;
private Boolean isSale=false;
private Boolean isNew=false;
private Boolean isVintage=false;
private Boolean isComingSoon=false;
private Long saleSize;
private Double minPrice=1.0;
private Double maxPrice=5000.0;
private Integer minSalePercentage=0;
private Integer maxSalePercentage=70;
private String socialCategory; 

Answer 1

因此，DTO仅是一种设计模式。 阅读更多

您可以只创建一个具有相同属性的类。

喜欢：

//.h
@interface SomeClassDTO : NSObject
@property (nonatomic, strong) NSArray *sizes;
@property (nonatomic, strong) NSArray *colors;
...
@property (nonatomic, assign) long vendor;
...
@end

//.m
@implementation SomeClassDTO
@end

Answer 2

从NSDictionary创建NSData： 如何将NSDictionary转换为NSData，反之亦然？ 然后您可以创建一个json对象，链接如下： http : //developer.apple.com/library/ios/#documentation/Foundation/Reference/NSJSONSerialization_Class/Reference/Reference.html

根据您的DTO创建一个类（我已使用局部变量）并填充字典，然后使用NSJSONserialization方法（具有所需的读取选项）创建jSON对象。 粗略的示例是：

        NSArray *colorArray = [[NSArray alloc]initWithObjects:@"Blue",@"Gray",nil ];

        NSString *vendorName = @"Name";
        double minPrice = 800.0;
        int minSalePercentage = 20;;

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

        //Convert primitive types to NSNumber
        NSNumber *minPriceNum= [NSNumber numberWithDouble:minPrice];
        [jSonDictionary setObject:minPriceNum forKey:@"minPrice"];

        NSNumber *salePercentNum= [NSNumber numberWithInt:minSalePercentage];
        [jSonDictionary setObject:salePercentNum forKey:@"minSalePercentage"];

        [jSonDictionary setObject:vendorName forKey:@"vendorName"];
        [jSonDictionary setObject:colorArray forKey:@"colors"];

        //Convert the dictionary containing DTO values into NSData.
        NSData *myData = [NSKeyedArchiver archivedDataWithRootObject:jSonDictionary]; 

之后，您可以使用：+（id）JSONObjectWithData：（NSData *）数据选项：（NSJSONReadingOptions）选择错误：（NSError **）错误