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MJExtension能做什么?
MJExtension是一套字典和模型之间互相转换的超轻量级框架
MJExtension能完成的功能
字典(JSON) --> 模型(Model) 模型(Model) --> 字典(JSON) 字典数组(JSONArray) --> 模型数组(ModelArray) 模型数组(ModelArray) --> 字典数组(JSONArray)
详尽用法主要参考 main.m中的各个函数 以及 NSObject+MJKeyValue.h
MJExtension和JSONModel、Mantle等框架的区别
1. 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.hMJConst.hMJConst.mMJFoundation.hMJFoundation.mMJIvar.hMJIvar.mMJType.hMJType.mNSObject+MJCoding.hNSObject+MJCoding.mNSObject+MJIvar.hNSObject+MJIvar.mNSObject+MJKeyValue.hNSObject+MJKeyValue.m
1.最简单的字典转模型
typedefenum{ SexMale, SexFemale} Sex;@interfaceUser:NSObject@property(copy,nonatomic)NSString*name;@property(copy,nonatomic)NSString*icon;@property(assign,nonatomic)intage;@property(assign,nonatomic)doubleheight;@property(strong,nonatomic)NSNumber*money;@property(assign,nonatomic) Sex sex;@endNSDictionary*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
@interfaceStatus: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;@endNSDictionary*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.pngNSString*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
@interfaceAd:NSObject@property(copy,nonatomic)NSString*image;@property(copy,nonatomic)NSString*url;@end@interfaceStatusResult: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@implementationStatusResult// 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"};}@endNSDictionary*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 *statusinresult.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 *adinresult.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)
@interfaceBag:NSObject@property(copy,nonatomic)NSString*name;@property(assign,nonatomic)doubleprice;@end@interfaceStudent: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@implementationStudent// 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"};}@endNSDictionary*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=2013-08NSLog(@"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 *userinuserArray) {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
参考NSObject+MJKeyValue.h参考NSObject+MJCoding.h
文/PP_Abner(简书作者)
原文链接://www.greatytc.com/p/93c242452b9b
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