Objective-C 序列化复杂对象列表

Question

我有一个如下所示的类列表:

@interface AISlideItem: NSObject
{
    NSString*  PlaceHolderName;
    NSUInteger PlaceHolderID;
}
@property (nonatomic, strong) NSString* PlaceHolderName;
@property (nonatomic) NSUInteger PlaceHolderID;

@end

@interface AITitleSlideItem : AISlideItem
{
    NSString* Title;
}
@property (nonatomic, strong) NSString* Title;
@end

@interface AIParagraphSlideItem : AISlideItem
{
    NSMutableArray* Paragraphs;
}
@property (nonatomic, strong) NSMutableArray* Paragraphs;
@end

@interface AITextSlideItem : AISlideItem
{
    NSString* Text;
}
@property (nonatomic, strong) NSString* Text;
@end

@interface AIPictureSlideItem : AISlideItem
{
    NSMutableData* Picture;
}
@property (nonatomic, strong) NSMutableData* Picture;
@end

@interface AISlideContent : NSObject
{
    NSString*       LayoutName;
    NSMutableArray* Items;
}
@property (nonatomic,strong) NSString* LayoutName;
@property (nonatomic,strong) NSMutableArray* Items;
@end

@interface ContentParaghraph : NSObject
{
    NSInteger Level;
    NSString* Text;
}
@property (nonatomic) NSInteger Level;
@property (nonatomic, strong) NSString* Text;
@end

我想将一个包含 AISlideContent 对象的 NSMutableArray 序列化为 json。 json 中的每个项目的名称都应该与变量的名称相同。

我怎样才能做到这一点？

这是一个示例 JSON:

{
  d: [
     {
          Items: [
          {
              placeHolderName: "1",
              Title: "Title Slide"
          },
          {
              placeHolderName: "2",
              Paragraphs: [
                 {
                     Level: 0,
                     Text: "Title content"
                 }
              ]
          }
       ],
       LayoutName: "Title"
     },
     {
         Items: [
         {
              placeHolderName: "1",
              Title: "Slide 2"
     },
     {
              placeHolderName: "2",
              Paragraphs: [
              {
                 Level: 0,
                 Text: "Line 1"
              },
              {
                 Level: 0,
                 Text: "Line 2"
              },
              {
                 Level: 1,
                 Text: "Line 2 indented"
              },
              {
                 Level: 2,
                 Text: "Line 3 more indented"
              },
              {
                 Level: 0,
                 Text: "Line 4"
              }
              ]
     }
      ],
      LayoutName: "Title and Content"
     },
     {
           Items: [
           {
                placeHolderName: "1",
                Title: "Slide 3"
           },
           {
                placeHolderName: "3",
                Picture: [

                ]
           }
       ],
       LayoutName: "Picture above Caption"
      }
      ]
}

p.s.我启用了 ARC

Answer 1

你必须关注 NSCoding 协议(protocol)和覆盖encodeObject和 decodeObject方法。

Here是一个样本。