iOS下JSON字符串反序列化成對象。在正式的項目中比較常見。例如以下幾個經常使用開源庫。能夠依據個人喜好任選其一：

1.?JSONModel:?https://github.com/icanzilb/JSONModel

2.?MJExtension:?https://github.com/CoderMJLee/MJExtension

3.?Mantle:?https://github.com/Mantle/Mantle

當中，JSONModel對數組元素反序列化，須要定義一個跟數組元素Model的類名同樣的@protocol

{
  "order_id": 104,
  "total_price": 103.45,
  "products" : [
    {
      "id": "123",
      "name": "Product #1",
      "price": 12.95
    },
    {
      "id": "137",
      "name": "Product #2",
      "price": 82.95
    }
  ]
}

@protocol ProductModel
@end

@interface ProductModel : JSONModel
@property (assign, nonatomic) int id;
@property (strong, nonatomic) NSString* name;
@property (assign, nonatomic) float price;
@end

@implementation ProductModel
@end

@interface OrderModel : JSONModel
@property (assign, nonatomic) int order_id;
@property (assign, nonatomic) float total_price;
@property (strong, nonatomic) NSArray<ProductModel, ConvertOnDemand>* products;
@end

@implementation OrderModel
@end

MJExtension號稱“世界上轉換速度最快、使用最簡單方便的字典轉模型框架”，有興趣的能夠看github下的詳細說明。

iOS下JSON反序列化開源庫