JSONModel的使用

文章目录

1. 1. 使用JSONModel
2. 2. 示例
   1. 2.1. 基础的例子
   2. 2.2. 嵌套类
   3. 2.3. 嵌套集合
   4. 2.4. 修改Key值
   5. 2.5. 全局改变Key
   6. 2.6. 使用JSON请求
   7. 2.7. JSON文本和Dictionary的转换
3. 3. 自定义Date格式

使用JSONModel

1. 创建一个新的Ocjective-C的类并继承JSONModel
2. 在头文件中声明Json中Keys同名属性

   @import "JSONModel.h"
   
   @interface CountryModel : JSONModel
   
   @property (assign,nonatomic) int id;
   @property (strong,nonatomic) NSString* country;
   @property (strong,nonatomic) NSString* dialCode;
   @property (assign,nonatomic) BOOL isInEurope;
   
   @end

不需要在.m文件中填写任何东西

解析JSON字符串时

NString* json = ...
NSError* error = nil;
CountryModel* contryModel = [[CountryModel alloc] initWithString:json error:&error];

示例

基础的例子

{
	"id":"123",
	"name":"Product name",
	"price":12.95
}

@interface ProductModel : JSONModel

@property (assign,nonatomic) int id;
@property (strong,nonatomic) NSString* name;
@property (assign,nonatomic) float price;

@end

嵌套类

{
	"order_id":104,
	"total_price":13.45,
	"product":{
		"id":"123",
		"name":"Product name",
		"price":12.34
	}
}

@interface OrderModel : JSONModel

@property (assign,nonatomic) int order_id;
@property (assign,nonatomic) float total_price;
@property (strong,nonatomic) ProductModel* product;

@end

嵌套集合

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

@potocol 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 tital_price;
@property (strong,nonatomic) NSArray<ProductModel> *products;

@end

@implementation OrderModel
@end

修改Key值

{
	"order_id":104,
	"order_details" : [
	{
		"name":"Product# 1",
		"price":{
			"usd":12.95
		}
	}
	]
}

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

@implementation OrderModel

+ (JSONKeyMapper *)keyMapper
{
	return [[JSONKeyMapper alloc] initWithDictionary:@{
		@"order_id":@"id",
		@"order_details.mame":@"productName",
		@"order_details.price":@"price"
	}];
}
@end

全局改变Key

[JSONModel setGlobalKeyMapper:[
	[JSONKeyMapper alloc] initWithDictionary:@{
		@"item_id":@"ID",
		@"item_name":@"itemName"
	}]
];

使用JSON请求

[[JSONHTTPClient requestHeaders] setValue:@"MySecret" forKey:@"AuthorizationToken"];
[JSONHTTPClient postJSONFromURLWithString:@"http://mydomain.com/api"
								   params:@{@"postParma1":@"valuel"}
							   completion:^(id json,JSONModelError *err){

								}];

JSON文本和Dictionary的转换

ProductModel* pm = [[ProductModel alloc] initWithString:jsonString error:nil];
pm.name = @"Changed Name";

NSDictionary* dict = [pm toDictionary];
NSString* string = [pm toJSONString];

自定义Date格式

@implementation JSONValueTransformer (CustomTransformer)

- (NSDate *)NSDateFromNSString:(NSString *)string {
	NSDateFormatter *formatter = [[NSDatrFormatter alloc] init];
	[formatter setDateFormat:APIDateFormat];
	return [formatter dateFromString:string];
}

- (NSString *)JSONObjectFromNSDate:(NSDate *)date {
	NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
	[formatter setDateFormat:APIDateFormat];
	return [formatter stringFromDate:date];
}

@end

注：关于名字为id的属性，可以使用id命名，而且需要使用NSNumber或者NSString的类型来定义