转载：https://www.jianshu.com/p/475b28160c89
1、简单的字典 --> 模型:
核心代码 mj_objectWithKeyValues
typedef enum {
SexMale,
SexFemale
} Sex;
@interface User : NSObject
@property (copy, nonatomic) NSString *name;/* 姓名 */
@property (copy, nonatomic) NSString *icon;/* 头像 */
@property (assign, nonatomic) unsigned int age;/* 年龄 */
@property (copy, nonatomic) NSString *height;/* 身高 */
@property (strong, nonatomic) NSNumber *money;/* 资产 */
@property (assign, nonatomic) Sex sex;/* 性别 */
@property (assign, nonatomic, getter=isGay) BOOL gay;/* 是否是同性恋 */
@end
//简单的字典
NSDictionary *dict_user = @{
@"name" : @"Jack",
@"icon" : @"lufy.png",
@"age" : @20,
@"height" : @"1.55",
@"money" : @100.9,
@"sex" : @(SexFemale),/* 枚举需要使用NSNumber包装 */
@"gay" : @YES
};
User *user = [User mj_objectWithKeyValues:dict_user];
NSLog(@"MJ---%@----%@---%u---%@---%@---%u----%d",user.name,user.icon,user.age,user.height,user.money,user.sex,user.gay);
//打印结果
//2016-07-04 11:06:59.746 PPDemos[2432:73824] MJ---Jack----lufy.png---20---1.55---100.9---1----1
2、JSON字符串 --> 模型
核心代码：mj_objectWithKeyValues:
// 定义一个JSON字符串
NSString *jsonStr = @"{\"name\":\"Jack\", \"icon\":\"lufy.png\", \"age\":20}";
User *user = [User mj_objectWithKeyValues:jsonStr];
NSLog(@"MJ---%@----%@---%u",user.name,user.icon,user.age);
//打印结果
//2016-07-04 11:16:04.655 PPDemos[2563:78561] MJ---Jack----lufy.png---20
3、复杂的字典 --> 模型 (模型里面包含了模型)
核心代码 mj_objectWithKeyValues:
//复杂的字典[模型中有个数组属性，数组里面又要装着其他模型的字典]
NSDictionary *dict_m8m = @{
@"text" : @"Agree!Nice weather!",
@"user" : @{
@"name" : @"Jack",
@"icon" : @"lufy.png"
},
@"retweetedStatus" : @{
@"text" : @"Nice weather!",
@"user" : @{
@"name" : @"Rose",
@"icon" : @"nami.png"
}
}
};
#import <Foundation/Foundation.h>
@class User;
@class Status;
//Status模型
@interface Status : NSObject
@property (copy, nonatomic) NSString *text;
@property (strong, nonatomic) User *user;/* 其他模型类型 */
@property (strong, nonatomic) Status *retweetedStatus;/* 自我模型类型 */
@end
//
//字典转模型，模型里面含有模型
Status *status = [Status mj_objectWithKeyValues:dict_m8m];
NSString *text = status.text;
NSString *name = status.user.name;
NSString *icon = status.user.icon;
NSLog(@"mj-----text=%@, name=%@, icon=%@", text, name, icon);
NSString *text2 = status.retweetedStatus.text;
NSString *name2 = status.retweetedStatus.user.name;
NSString *icon2 = status.retweetedStatus.user.icon;
NSLog(@"mj-----text2=%@, name2=%@, icon2=%@", text2, name2, icon2);
//
//打印结果
//2016-07-04 11:45:39.675 PPDemos[2781:87089] mj-----text=Agree!Nice weather!, name=Jack, icon=lufy.png
//2016-07-04 11:45:39.675 PPDemos[2781:87089] mj-----text2=Nice weather!, name2=Rose, icon2=nami.png
4、模型中有个数组属性，数组里面又要装着其它模型
核心代码 mj_objectWithKeyValues和mj_objectClassInArray:
@interface Ad : NSObject
@property (copy, nonatomic) NSString *image;
@property (copy, nonatomic) NSString *url;
@end
@interface StatusResult : NSObject
/** 存放着一堆的微博数据（里面都是Status模型） */
@property (strong, nonatomic) NSMutableArray *statuses;
/** 存放着一堆的广告数据（里面都是Ad模型） */
@property (strong, nonatomic) NSArray *ads;
@property (strong, nonatomic) NSNumber *totalNumber;
@end
#import "StatusResult.h"
#import "MJExtension.h"
@implementation StatusResult
/* 数组中存储模型数据，需要说明数组中存储的模型数据类型 */
+(NSDictionary *)mj_objectClassInArray
{
return @{
@"statuses" : @"Status",
@"ads" : @"Ad"
};
}
@end
#####在VC里实现以下来解析数据
NSDictionry dict_m8a = @{
@"statuses" :
@[
@{
@"text" : @"Nice weather!",
@"user" : @{
@"name" : @"Rose",
@"icon" : @"nami.png"
}
},
@{
@"text" : @"Go camping tomorrow!",
@"user" : @{
@"name" : @"Jack",
@"icon" : @"lufy.png"
}
}
],
@"ads":
@[
@{
@"image" : @"ad01.png",
@"url" : @"http://www.ad01.com"
},
@{
@"image" : @"ad02.png",
@"url" : @"http://www.ad02.com"
}
],
@"totalNumber" : @"2014"
};
//【重点，核心】》》数组中存储模型数据，需要说明数组中存储的模型数据类型
[StatusResult mj_setupObjectClassInArray:^NSDictionary *{
return @{
@"statuses" : @"Status",
// @"statuses" : [Status class],
@"ads" : @"Ad"
// @"ads" : [Ad class]
};
}];
// Equals: StatusResult.m implements + mj_objectClassInArray method.
//以上方法在VC里写，如果多个地方解析该model，就要写多次，最好在model的.m文件写！
//字典转模型，支持模型的数组属性里面又装着模型
StatusResult *result = [StatusResult mj_objectWithKeyValues:dict_m8a];
//打印博主信息
for (Status *status in result.statuses) {
NSString *text = status.text;
NSString *name = status.user.name;
NSString *icon = status.user.icon;
NSLog(@"mj---text=%@, name=%@, icon=%@", text, name, icon);
}
//打印广告
for (Ad *ad in result.ads) {
NSLog(@"mj---image=%@, url=%@", ad.image, ad.url);
}
//打印结果
//2016-07-04 13:47:58.994 PPDemos[3353:113055] mj---text=Nice weather!, name=Rose, icon=nami.png
//2016-07-04 13:47:58.995 PPDemos[3353:113055] mj---text=Go camping tomorrow!, name=Jack, icon=lufy.png
//2016-07-04 13:47:58.995 PPDemos[3353:113055] mj---image=ad01.png, url=http://www.ad01.com
//2016-07-04 13:47:58.995 PPDemos[3353:113055] mj---image=ad02.png, url=http://www.ad02.com
5、模型中的属性名和字典中的key不相同(或者需要多级映射)
核心代码： mj_objectWithKeyValues:和mj_replacedKeyFromPropertyName：
- 多级映射，用点语法设置
@interface Bag : NSObject @property (copy, nonatomic) NSString *name; @property (assign, nonatomic) double price; @endimport <Foundation/Foundation.h> @class Bag; @interface Student : NSObject @property (copy, nonatomic) NSString *ID; @property (copy, nonatomic) NSString *desc; @property (copy, nonatomic) NSString *nowName; @property (copy, nonatomic) NSString *oldName; @property (copy, nonatomic) NSString *nameChangedTime; @property (strong, nonatomic) Bag *bag; @end@implementation Student +(NSDictionary *)mj_replacedKeyFromPropertyName { // 实现这个方法的目的：告诉MJExtension框架模型中的属性名对应着字典的哪个key return @{ @"ID" : @"id", @"desc" : @"desciption", @"oldName" : @"name.oldName", @"nowName" : @"name.newName", @"nameChangedTime" : @"name.info[1].nameChangedTime", @"bag" : @"other.bag" }; } @endNSDictionry *dict_nokey = @{ @"id" : @"20", @"desciption" : @"kids", @"name" : @{ @"newName" : @"lufy", @"oldName" : @"kitty", @"info" : @[ @"test-data", @{ @"nameChangedTime" : @"2013-08" } ] }, @"other" : @{ @"bag" : @{ @"name" : @"a red bag", @"price" : @100.7 } } };// // // How to map // [Student mj_setupReplacedKeyFromPropertyName:^NSDictionary *{ // return @{ // @"ID" : @"id", // @"desc" : @"desciption", // @"oldName" : @"name.oldName", // @"nowName" : @"name.newName", // @"nameChangedTime" : @"name.info[1].nameChangedTime", // @"bag" : @"other.bag" // }; // }]; // // Equals: Student.m implements +mj_replacedKeyFromPropertyName method. //字典转模型，支持多级映射 Student *stu = [Student mj_objectWithKeyValues:dict_nokey]; //打印 NSLog(@"ID=%@, desc=%@, oldName=%@, nowName=%@, nameChangedTime=%@", stu.ID, stu.desc, stu.oldName, stu.nowName, stu.nameChangedTime); NSLog(@"bagName=%@, bagPrice=%f", stu.bag.name, stu.bag.price); //2016-07-04 14:20:28.082 PPDemos[3602:126004] ID=20, desc=kids, oldName=kitty, nowName=lufy, nameChangedTime=2013-08 //2016-07-04 14:20:28.082 PPDemos[3602:126004] bagName=a red bag, bagPrice=100.700000
6.将一个字典数组转成模型数组
核心代码mj_objectArrayWithKeyValuesArray:
NSArray *dictArray = @[
@{
@"name" : @"Jack",
@"icon" : @"lufy.png"
},
@{
@"name" : @"Rose",
@"icon" : @"nami.png"
}
];
//字典数组转模型数组，使用的是mj_objectArrayWithKeyValuesArray:方法
NSArray *userArray = [User mj_objectArrayWithKeyValuesArray:dictArray];
//打印
for (User *user in userArray) {
NSLog(@"name=%@, icon=%@", user.name, user.icon);
}
// name=Jack, icon=lufy.png
// name=Rose, icon=nami.png
7、 将一个模型转成字典
核心代码mj_keyValues：
User *user = [[User alloc] init];
user.name = @"Jack";
user.icon = @"lufy.png";
//
Status *status = [[Status alloc] init];
status.user = user;
status.text = @"Nice mood!";
//
//模型转字典，使用的是mj_keyValues属性
NSDictionary *statusDict = status.mj_keyValues;
NSLog(@"%@", statusDict);
/*
{
text = "Nice mood!";
user = {
icon = "lufy.png";
name = Jack;
};
}
8、将一个模型数组转成字典数组
核心代码mj_keyValuesArrayWithObjectArray：
//创建模型数组
User *user1 = [[User alloc] init];
user1.name = @"Jack";
user1.icon = @"lufy.png";
User *user2 = [[User alloc] init];
user2.name = @"Rose";
user2.icon = @"nami.png";
NSArray *userArray = @[user1, user2];
//模型数组转字典数组，使用的是mj_keyValuesArrayWithObjectArray:方法
NSArray *dictArray = [User mj_keyValuesArrayWithObjectArray:userArray];
NSLog(@"%@", dictArray);
/*
(
{
icon = "lufy.png";
name = Jack;
},
{
icon = "nami.png";
name = Rose;
}
)
*/
更多用法
- 参考NSObject+MJKeyValue.h
- 参考NSObject+MJCoding.h