【OC】JSONModel基本使用

JSONModel是一个库，让我们能快速创建智能数据模型。

基本使用

假设我有这样一个JSON数据

{
    "country":"Germany",
    "dialCode": 49,
    "isInEurope":YES
}

1. 创建一个新的Objective-C类，并使其继承JSONModel类。
2. 声明与JSON键同名的属性。

#import "JSONModel.h"


NS_ASSUME_NONNULL_BEGIN

@interface CountryModel : JSONModel

@property (nonatomic, copy) NSString* country;
@property (nonatomic, copy) NSString* dialCode;
@property (nonatomic, assign) BOOL isInEurope;

@end

NS_ASSUME_NONNULL_END

3. 初始化数据模型。

NSError* error = nil;

CountryModel* countryModel = [[CountryModel alloc] initWithDictionary:dict error:error];

如果JSON的验证通过你在你的模型中填充的JSON所有相应的属性。JSONModel也将尝试将尽可能多的数据转换为您所期望的类型，在这个例子中，dialCode将数字转换成字符串。

网络请求数据转换模型

接口：https://news–at.zhihu.com/api/4/version/ios/2.3.0

返回数据示例：

{
"status":1,
"msg":"【更新内容】rnrn★ 多图有标记 流量壕忽略rn★ 出门前离线 没网也能看rn★ 喜欢请好评 不喜快吐槽rn★ 萌妹工程师 邮箱在下面rnmua@zhihu.comrn（一般人我们不告诉他）",
"latest":"2.5"
}

Objective-C类：

@interface TestModel : JSONModel
@property (nonatomic, assign) int status;
@property (nonatomic, copy) NSString* msg;
@property (nonatomic, copy) NSString* latest;
@end

请求数据：

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    NSString* string = [NSString stringWithFormat:@"https://news-at.zhihu.com/api/4/version/ios/2.3.0"];
    string = [string stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];

    NSURL* url = [NSURL URLWithString:string];
    NSURLRequest* request = [NSURLRequest requestWithURL:url];
    NSURLSession* session = [NSURLSession sharedSession];
    NSURLSessionDataTask* dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        TestModel* country = [[TestModel alloc] initWithData:data error:nil];
        NSLog(@"%@", country);
    }];
    [dataTask resume];
}

结果：

集合、嵌套型数据

接口：https://news-at.zhihu.com/api/4/news/latest

返回数据示例：

{
    "date":"20221015",
    "stories":[
        {
            "image_hue":"0xa08861",
            "title":"小事 · 外婆的「江湖」",
            "url":"https://daily.zhihu.com/story/9754027",
            "hint":"VOL.1445",
            "ga_prefix":"101507",
            "images":[
                "https://pic2.zhimg.com/v2-c54a943ca0074ad6f85c3935d4205ce8.jpg?source=8673f162"
            ],
            "type":0,
            "id":9754027
        },
        {
            "image_hue":"0x9c3b4b",
            "title":"超长篇哆啦 A 梦漫画哪一部水平最高？",
            "url":"https://daily.zhihu.com/story/9753999",
            "hint":"Shimmer · 9 分钟阅读",
            "ga_prefix":"101507",
            "images":[
                "https://pic2.zhimg.com/v2-6a2b729e0ffc66150ebf865aed19cadd.jpg?source=8673f162"
            ],
            "type":0,
            "id":9753999
        },
        {
            "image_hue":"0x311a2b",
            "title":"据说宇宙大爆炸之前没有时间与空间，「没有时间、空间」是什么意思？",
            "url":"https://daily.zhihu.com/story/9754006",
            "hint":"王清扬 · 3 分钟阅读",
            "ga_prefix":"101507",
            "images":[
                "https://pic1.zhimg.com/v2-7b449549c16e7aa1757043c10ff51aaf.jpg?source=8673f162"
            ],
            "type":0,
            "id":9754006
        },
        {
            "image_hue":"0x1b3533",
            "title":"近视眼在老了以后真的会恢复并且中和老花眼吗？",
            "url":"https://daily.zhihu.com/story/9754008",
            "hint":"中科院物理所 · 1 分钟阅读",
            "ga_prefix":"101507",
            "images":[
                "https://pic2.zhimg.com/v2-352360b6eb73711a9b5ef1f76c1894e5.jpg?source=8673f162"
            ],
            "type":0,
            "id":9754008
        },
        {
            "image_hue":"0x3b2f25",
            "title":"中世纪的教士是如何敛财和升职的？",
            "url":"https://daily.zhihu.com/story/9754018",
            "hint":"莱茵行宫伯爵 · 10 分钟阅读",
            "ga_prefix":"101507",
            "images":[
                "https://pica.zhimg.com/v2-d7c8282951f182efcbde644bd3b5d85f.jpg?source=8673f162"
            ],
            "type":0,
            "id":9754018
        },
        {
            "image_hue":"0x472d1b",
            "title":"10 × 10 的正方形最多可放入多少个直径为 1 的圆？",
            "url":"https://daily.zhihu.com/story/9754022",
            "hint":"酱紫君 · 3 分钟阅读",
            "ga_prefix":"101507",
            "images":[
                "https://pic1.zhimg.com/v2-7687a394ff65690621f2934ea0fe91c3.jpg?source=8673f162"
            ],
            "type":0,
            "id":9754022
        }
    ],
    "top_stories":[
        {
            "image_hue":"0xa08861",
            "hint":"作者 / 姜喵",
            "url":"https://daily.zhihu.com/story/9754027",
            "image":"https://pic1.zhimg.com/v2-6c638b9f5b35c93c0e5c6ecb5a30611a.jpg?source=8673f162",
            "title":"小事 · 外婆的「江湖」",
            "ga_prefix":"101507",
            "type":0,
            "id":9754027
        },
        {
            "image_hue":"0x040505",
            "hint":"作者 / 王治钧Lawrence",
            "url":"https://daily.zhihu.com/story/9753968",
            "image":"https://pic2.zhimg.com/v2-b55613fa89bf75a9c2dc6255cb240d96.jpg?source=8673f162",
            "title":"你经历或见证过哪些「曼德拉效应」事件？",
            "ga_prefix":"101407",
            "type":0,
            "id":9753968
        },
        {
            "image_hue":"0x40372d",
            "hint":"作者 / 豆子",
            "url":"https://daily.zhihu.com/story/9753873",
            "image":"https://picx.zhimg.com/v2-c8e1fa94c269e7318a10ea1562dba69b.jpg?source=8673f162",
            "title":"古代的丫鬟每天都做什么？",
            "ga_prefix":"101007",
            "type":0,
            "id":9753873
        },
        {
            "image_hue":"0x919399",
            "hint":"作者 / 知乎用户",
            "url":"https://daily.zhihu.com/story/9753797",
            "image":"https://picx.zhimg.com/v2-4fa5e85fe83822f33d039e4cacc77598.jpg?source=8673f162",
            "title":"为什么饭店的大铁锅从来都不粘锅？",
            "ga_prefix":"100907",
            "type":0,
            "id":9753797
        },
        {
            "image_hue":"0x121924",
            "hint":"作者 / 瞻云",
            "url":"https://daily.zhihu.com/story/9753754",
            "image":"https://picx.zhimg.com/v2-ef9dfc5cb5b221cf487d878f19133cd9.jpg?source=8673f162",
            "title":"如果没有生殖隔离地球会变成什么样？",
            "ga_prefix":"100807",
            "type":0,
            "id":9753754
        }
    ]
}

• 对于这种数据，我们需要将每一个嵌套都写成一个类。这些我们可以全部在一个文件中实现。

@protocol StoriesModel
@end

@protocol Top_StoriesModel
@end

#import <UIKit/UIKit.h>

#import "JSONModel.h"

NS_ASSUME_NONNULL_BEGIN

@interface StoriesModel : JSONModel
@property (nonatomic, copy) NSString* title;
@property (nonatomic, copy) NSString* ga_prefix;
@property (nonatomic, copy) NSString* image_hue;
@property (nonatomic, copy) NSString* type;
@property (nonatomic, assign) NSString* id;
@end

@interface Top_StoriesModel : JSONModel
@property (nonatomic, copy) NSString* title;
@property (nonatomic, copy) NSString* ga_prefix;
@property (nonatomic, copy) NSString* image_hue;
@property (nonatomic, copy) NSString* type;
@property (nonatomic, assign) NSString* id;

@end

@interface TestModel : JSONModel

@property (nonatomic, copy) NSString* data;
@property (nonatomic, copy) NSArray<StoriesModel>* stories;
@property (nonatomic, copy) NSArray<Top_StoriesModel>* top_tories;

//@property (nonatomic, assign) int status;
//@property (nonatomic, copy) NSString* msg;
//@property (nonatomic, copy) NSString* latest;
@end

NS_ASSUME_NONNULL_END

.m文件中：

#import "TestModel.h"

@implementation StoriesModel
+ (BOOL) propertyIsOptional:(NSString *)propertyName {
    return YES;
}
@end

@implementation Top_StoriesModel
+ (BOOL) propertyIsOptional:(NSString *)propertyName {
    return YES;
}
@end

@implementation TestModel
+ (BOOL) propertyIsOptional:(NSString *)propertyName {
    return YES;
}
@end

发送网络请求：

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    NSString* string = [NSString stringWithFormat:@"https://news-at.zhihu.com/api/4/news/latest"];
    string = [string stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];

    NSURL* url = [NSURL URLWithString:string];
    NSURLRequest* request = [NSURLRequest requestWithURL:url];
    NSURLSession* session = [NSURLSession sharedSession];
    NSURLSessionDataTask* dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        TestModel* country = [[TestModel alloc] initWithData:data error:nil];
        NSLog(@"%@", country.stories[0]);
    }];
    [dataTask resume];
}

结果：

代码007普通

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