MJExtension是一套常用的"字典和模型之间互相转换"的框架，在项目中也使用过，现在记录一下。随着Swift的普及，在Swift中也有一个类似功能的框架HandyJSON 也非常好用。有空我也会介绍一下这个框架。
MJExtension 能完成的功能
<1> 字典转模型
<2>模型转字典
<3>字典数组->模型数组
<4>模型数组->字典数组
一 字典转模型
//字典转模型 - (void) dicToModel { //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(@"%@ %u %@",user.name,user.sex,user.icon); }
二 JSON字符串转模型
- (void) stringToModel { NSString *jsonStr = @"{\"name\":\"Jack\", \"icon\":\"lufy.png\", \"age\":20}"; User *user = [User mj_objectWithKeyValues:jsonStr]; NSLog(@"%@ %u %@",user.name,user.age,user.icon); }
三 复杂的字典转模型
@interface Status : NSObject @property (nonatomic,copy) NSString *text; @property (nonatomic,strong) User *user; @property (nonatomic,strong) Status *retweetedStatus; @end - (void)complexDicToModel { NSDictionary *dict_m8m = @{ @"text" : @"Agree!Nice weather!", @"user" : @{ @"name" : @"Jack", @"icon" : @"lufy.png" }, @"retweetedStatus" : @{ @"text" : @"Nice weather!", @"user" : @{ @"name" : @"Rose", @"icon" : @"nami.png" } } }; 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); }
四 模型中有个数组属性，数组里面又装着其他属性
@interface Status : NSObject @property (nonatomic,copy) NSString *text; @property (nonatomic,strong) User *user; @property (nonatomic,strong) Status *retweetedStatus; @end @interface ADModel : NSObject @property (nonatomic,copy) NSString *image; @property (nonatomic,copy) NSString *url; @end @interface resultModel : NSObject @property (nonatomic,strong) NSMutableArray *statuses; @property (nonatomic,strong) NSMutableArray *ads; @property (nonatomic,strong) NSNumber *totalNumber; @property (nonatomic,assign) long long previousCursor; @property (nonatomic,assign) long long nextCursor; @end @implementation resultModel + (NSDictionary *)mj_objectClassInArray { return @{@"statuses" : @"Status", @"ads":@"ADModel"}; } @end - (void)complexDicContentArrToModel { // 1.定义一个字典 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.小码哥ad01.com" }, @{ @"image" : @"ad02.png", @"url" : @"http://www.小码哥ad02.com" } ], @"totalNumber" : @"2014", @"previousCursor" : @"13476589", @"nextCursor" : @"13476599" }; resultModel *model = [resultModel mj_objectWithKeyValues:dict]; NSLog(@"resultModel %lld ",model.nextCursor,model.previousCursor); // 4.打印statuses数组中的模型属性 for (Status *status in model.statuses) { NSString *text = status.text; NSString *name = status.user.name; NSString *icon = status.user.icon; MJExtensionLog(@"text=%@, name=%@, icon=%@", text, name, icon); } // 5.打印ads数组中的模型属性 for (ADModel *ad in model.ads) { MJExtensionLog(@"image=%@, url=%@", ad.image, ad.url); } }
五 简单的字典转模型 (key替换 比如ID和id，支持多级映射)
@interface Bag : NSObject @property (nonatomic,copy) NSString *name; @property (nonatomic,assign) CGFloat price; @end @interface Student : NSObject @property (copy, nonatomic) NSString *ID; @property (copy, nonatomic) NSString *otherName; @property (copy, nonatomic) NSString *nowName; @property (copy, nonatomic) NSString *oldName; @property (copy, nonatomic) NSString *nameChangedTime; @property (copy, nonatomic) NSString *desc; @property (strong, nonatomic) Bag *bag; @end @implementation Student + (NSDictionary *)mj_replacedKeyFromPropertyName { return @{@"ID":@"id",@"desc":@"desciption",@"oldName":@"name.oldName",@"nowName":@"name.newName",@"nameChangedTime":@"name.info[1].nameChangedTime",@"bag":@"other.bag"}; } @end - (void)keyValues2object4 { // 1.定义一个字典 NSDictionary *dict = @{ @"id" : @"20", @"desciption" : @"好孩子", @"name" : @{ @"newName" : @"lufy", @"oldName" : @"kitty", @"info" : @[ @"test-data", @{@"nameChangedTime" : @"2013-08-07"} ] }, @"other" : @{ @"bag" : @{ @"name" : @"小书包", @"price" : @100.7 } } }; // 2.将字典转为MJStudent模型 Student *stu = [Student mj_objectWithKeyValues:dict]; // 3.打印MJStudent模型的属性 MJExtensionLog(@"ID=%@, desc=%@, oldName=%@, nowName=%@, nameChangedTime=%@", stu.ID, stu.desc, stu.oldName, stu.nowName, stu.nameChangedTime); MJExtensionLog(@"bagName=%@, bagPrice=%f", stu.bag.name, stu.bag.price); }
六 将一个字典数组转成模型数组
- (void)arrayToModel { NSArray *dictArray = @[ @{ @"name" : @"Jack", @"icon" : @"lufy.png" }, @{ @"name" : @"Rose", @"icon" : @"nami.png" } ]; NSArray *userArray = [User mj_objectArrayWithKeyValuesArray:dictArray]; for (User *user in userArray) { NSLog(@"name=%@, icon=%@", user.name, user.icon); } }
七 将一个模型转成字典
- (void)modelToDict { User *user = [[User alloc] init]; user.name = @"jack"; user.icon = @"lufy.png"; NSDictionary *userDic = user.mj_keyValues; NSLog(@"%@",userDic); }
八 将一个模型数组转成字典数组
//模型数组 转 字典数组 - (void)modelArrayToDicArray { 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]; NSArray *dictArray = [User mj_keyValuesArrayWithObjectArray:userArray]; }
九 NSCoding 示例
#import <Foundation/Foundation.h> #import "MJExtension.h" @interface LFCar : NSObject @property (nonatomic,copy) NSString *name; @property (nonatomic,assign) double price; @end #import "LFCar.h" @implementation LFCar MJExtensionCodingImplementation @end - (void)viewDidLoad { [super viewDidLoad]; LFCar *car = [[LFCar alloc] init]; car.name = @"red bag"; car.price = 200.8; NSString *file = [NSTemporaryDirectory() stringByAppendingPathComponent:@"bag.data"]; //归档 [NSKeyedArchiver archiveRootObject:car toFile:file]; //解档 LFCar *decodedCar = [NSKeyedUnarchiver unarchiveObjectWithFile:file]; NSLog(@"%@ %f",decodedCar.name,decodedCar.price); }
这就是MJExtension 的基本用法 还有一些其他的不常用的用法 参考这里http://blog.csdn.net/jeikerxiao/article/details/51590222
