字典(JSON) --> 模型(Model) 模型(Model) --> 字典(JSON) 字典数组(JSON Array) --> 模型数组(Model Array) 模型数组(Model Array) --> 字典数组(JSON Array) 详尽用法主要参 main.m中的各个函数 以及 NSObject+MJKeyValue.h
MJExtension和JSONModel、Mantle等框架的区别
转换速率: 最近一次测试表明:MJExtension > JSONModel > Mantle 各位开发者也可以自行测试
2.具体用法: JSONModel:
要求所有模型类必须继承自JSONModel基类 Mantle:
要求所有模型类必须继承自MTModel基类 MJExtension:
不需要你的模型类继承任何特殊基类,毫无污染,毫无侵入性 如何使用MJExtension 方法一:cocoapods导入:pod 'MJExtension'
方法二:手动导入:
将MJExtensionExample/MJExtensionExample/MJExtension文件夹中的所有源代码拽入项目中 导入主头文件:#import "MJExtension.h" MJExtension.h MJConst.h
MJConst.m MJFoundation.h
MJFoundation.m MJIvar.h
MJIvar.m MJType.h
MJType.m NSObject+MJCoding.h
NSObject+MJCoding.m NSObject+MJIvar.h
NSObject+MJIvar.m NSObject+MJKeyValue.h
NSObject+MJKeyValue.m 1.最简单的字典转模型 typedef enum { SexMale,
SexFemale} Sex; @interface User : NSObject @property (copy, nonatomic) NSString name; @property (copy, nonatomic) NSString icon; @property (assign, nonatomic) int age; @property (assign, nonatomic) double height; @property (strong, nonatomic) NSNumber *money; @property (assign, nonatomic) Sex sex; @end
NSDictionary *dict = @{ @"name" : @"Jack",
@"icon" : @"lufy.png",
@"age" : @20,
@"height" : @"1.55",
@"money" : @100.9,
@"sex" : @(SexFemale)
};
// 将字典转为User模型 User *user = [User objectWithKeyValues:dict]; NSLog(@"name=%@, icon=%@, age=%d, height=%@, money=%@, sex=%d", user.name, user.icon, user.age, user.height, user.money, user.sex); // name=Jack, icon=lufy.png, age=20, height=1.550000, money=100.9, sex=1 核心代码1:
[User objectWithKeyValues:dict] 2.模型中嵌套模型 @interface Status : NSObject / 微博文本内容 / @property (copy, nonatomic) NSString text; / 微博作者 / @property (strong, nonatomic) User user; /* 转发的微博 / @property (strong, nonatomic) Status *retweetedStatus; @end
NSDictionary *dict = @{
@"text" : @"是啊,今天天气确实不错!", @"user" : @{
@"name" : @"Jack",
@"icon" : @"lufy.png"
},
@"retweetedStatus" : @{
@"text" : @"今天天气真不错!",
@"user" : @{
@"name" : @"Rose",
@"icon" : @"nami.png"
}
}
};
// 将字典转为Status模型 Status status = [Status objectWithKeyValues:dict]; NSString text = status.text; NSString name = status.user.name; NSString icon = status.user.icon; NSLog(@"text=%@, name=%@, icon=%@", text, name, icon); // text=是啊,今天天气确实不错!, name=Jack, icon=lufy.png
NSString text2 = status.retweetedStatus.text; NSString name2 = status.retweetedStatus.user.name; NSString *icon2 = status.retweetedStatus.user.icon; NSLog(@"text2=%@, name2=%@, icon2=%@", text2, name2, icon2); // text2=今天天气真不错!, name2=Rose, icon2=nami.png 核心代码2
[Status objectWithKeyValues:dict] 3.模型中有个数组属性,数组里面又要装着其它模型 @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
@implementation StatusResult // 实现这个方法的目的:告诉MJExtension框架statuses和ads数组里面装的是什么模型 / + (NSDictionary )objectClassInArray{
return @{
@"statuses" : [Status class],
@"ads" : [Ad class] }; }
(Class)objectClassInArray:(NSString )propertyName{
if ([propertyName isEqualToString:@"statuses"]) {
return [Status class];
} else if ([propertyName isEqualToString:@"ads"]) {
return [Ad class]; }
return nil;} /
// 这个方法对比上面的2个方法更加没有侵入性和污染,因为不需要导入Status和Ad的头文件
(NSDictionary *)objectClassInArray{
return @{
@"statuses" : @"Status",
@"ads" : @"Ad"
}; } @end
NSDictionary *dict = @{
@"statuses" : @[
@{
@"text" : @"今天天气真不错!", @"user" : @{
@"name" : @"Rose", @"icon" : @"nami.png"
}
},
@{
@"text" : @"明天去旅游了",
@"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"
};
// 将字典转为StatusResult模型
StatusResult *result = [StatusResult objectWithKeyValues:dict]; NSLog(@"totalNumber=%@", result.totalNumber); // totalNumber=2014
// 打印statuses数组中的模型属性
for (Status *status in result.statuses) {
NSString *text = status.text;
NSString *name = status.user.name; NSString *icon = status.user.icon;
NSLog(@"text=%@, name=%@, icon=%@", text, name, icon);} // text=今天天气真不错!, name=Rose, icon=nami.png
// text=明天去旅游了, name=Jack, icon=lufy.png
// 打印ads数组中的模型属性
for (Ad *ad in result.ads) {
NSLog(@"image=%@, url=%@", ad.image, ad.url);} // image=ad01.png, url=http://www.ad01.com
// image=ad02.png, url=http://www.ad02.com
核心代码3:
在模型内部实现+ (NSDictionary *)objectClassInArray方法 [StatusResult objectWithKeyValues:dict]
4.模型中的属性名和字典中的key不相同(或者需要多级映射) @interface Bag : NSObject @property (copy, nonatomic) NSString name; @property (assign, nonatomic) double price;@end@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 // 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
(NSDictionary *)replacedKeyFromPropertyName{
return @{
@"ID" : @"id",
@"desc" : @"desciption",
@"oldName" : @"name.oldName", @"nowName" : @"name.newName",
@"nameChangedTime" : @"name.info.nameChangedTime",
@"bag" : @"other.bag"
}; }
@end
NSDictionary *dict = @{
@"id" : @"20",
@"desciption" : @"孩子", @"name" : @{
@"newName" : @"lufy", @"oldName" : @"kitty",
@"info" : @{
@"nameChangedTime" : @"2013-08"
}
},
@"other" : @{
@"bag" : @{
@"name" : @"小书包", @"price" : @100.7
}
}
};
// 将字典转为Student模型 Student *stu = [Student objectWithKeyValues:dict]; // 打印Student模型的属性 NSLog(@"ID=%@, desc=%@, oldName=%@, nowName=%@, nameChangedTime=%@", stu.ID, stu.desc, stu.oldName, stu.nowName, stu.nameChangedTime); // ID=20, desc=孩子, oldName=kitty, nowName=lufy, nameChangedTime=2013-08 NSLog(@"bagName=%@, bagPrice=%f", stu.bag.name, stu.bag.price); // bagName=小书包, bagPrice=100.700000 核心代码4:
在模型内部实现+ (NSDictionary *)replacedKeyFromPropertyName方法 [Student objectWithKeyValues:dict]
5.将一个字典数组转成模型数组 NSArray *dictArray = @[
@{
@"name" : @"Jack",
@"icon" : @"lufy.png",
},
@{
@"name" : @"Rose",
@"icon" : @"nami.png",
}
];
// 将字典数组转为User模型数组 NSArray userArray = [User objectArrayWithKeyValuesArray:dictArray]; // 打印userArray数组中的User模型属性 for (User user in userArray) {
NSLog(@"name=%@, icon=%@", user.name, user.icon);} // name=Jack, icon=lufy.png // name=Rose, icon=nami.png 核心代码5:
[User objectArrayWithKeyValuesArray:dictArray] 6.将一个模型转成字典 // 新建模型 User *user = [[User alloc] init]; user.name = @"Jack"; user.icon = @"lufy.png";
Status *status = [[Status alloc] init]; status.user = user; status.text = @"今天的心情不错!";
// 将模型转为字典 NSDictionary statusDict = status.keyValues; NSLog(@"%@", statusDict); /{ text = "今天的心情不错!";
user = {
icon = "lufy.png";
name = Jack;
}; }*/
// 多级映射的模型 Student *stu = [[Student alloc] init]; stu.ID = @"123"; stu.oldName = @"rose"; stu.nowName = @"jack"; stu.desc = @"handsome"; stu.nameChangedTime = @"2018-09-08";
Bag bag = [[Bag alloc] init]; bag.name = @"小书包"; bag.price = 205; stu.bag = bag; NSDictionary stuDict = stu.keyValues;NSLog(@"%@", stuDict); / { desciption = handsome;
id = 123;
name = {
info ={
nameChangedTime = "2018-09-08";
};
newName = jack;
oldName = rose;
};
other = {
bag ={
name = "小书包";
price = 205;
};
}; } / 核心代码6:
status.keyValues、stu.keyValues 7.将一个模型数组转成字典数组 // 新建模型数组 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]; // 将模型数组转为字典数组 NSArray dictArray = [User keyValuesArrayWithObjectArray:userArray]; NSLog(@"%@", dictArray); /(
{ icon = "lufy.png"; name = Jack; },
{ icon = "nami.png"; name = Rose; } )/ 核心代码7:
[User keyValuesArrayWithObjectArray:userArray] 更多用法 参NSObject+MJKeyValue.h 参NSObject+MJCoding.h