将JSON字符串解析为对象数组Objective C [英] parse JSON string into array of objects Objective C

问题描述

我有一个从休息Web服务请求返回的JSON字符串，
我想将此字符串解析为确定类的对象数组，
这是JSON字符串

I have a JSON String returned from rest web service request, I want to parse this string into Array of objects from determined class, this is the JSON string

[
    {
        "validationCode": null,
        "FirstName": "Samer",
        "LastName": "Shame",
        "MobileNumber": "0991992993",
        "SimNumber": null,
        "Email": null,
        "PhoneNumber": "0991992994",
        "Name": "Abo Alshamat",
        "ID": 1
    },
    {
        "validationCode": null,
        "FirstName": "Ahmad",
        "LastName": "Ali",
        "MobileNumber": "0992993994",
        "SimNumber": null,
        "Email": null,
        "PhoneNumber": "0992993995",
        "Name": "AL-Kamal",
        "ID": 2
    },
    {
        "validationCode": null,
        "FirstName": null,
        "LastName": null,
        "MobileNumber": "0993377800",
        "SimNumber": null,
        "Email": null,
        "PhoneNumber": null,
        "Name": "Abo-MAhmoud",
        "ID": 12
    },
    {
        "validationCode": null,
        "FirstName": "William",
        "LastName": "Ammar",
        "MobileNumber": "0993994995",
        "SimNumber": null,
        "Email": null,
        "PhoneNumber": "0993994996",
        "Name": "Four Season",
        "ID": 3
    },
    {
        "validationCode": null,
        "FirstName": "Ammar",
        "LastName": "William",
        "MobileNumber": "0999555777",
        "SimNumber": null,
        "Email": null,
        "PhoneNumber": null,
        "Name": "uuuuu",
        "ID": 20
    },
    {
        "validationCode": null,
        "FirstName": null,
        "LastName": null,
        "MobileNumber": "0999888777",
        "SimNumber": null,
        "Email": null,
        "PhoneNumber": null,
        "Name": "NewOneFromI2",
        "ID": 18
    },
    {
        "validationCode": null,
        "FirstName": null,
        "LastName": null,
        "MobileNumber": "0999998997",
        "SimNumber": null,
        "Email": null,
        "PhoneNumber": "0999999998",
        "Name": "JOURY",
        "ID": 4
    },
    {
        "validationCode": null,
        "FirstName": null,
        "LastName": null,
        "MobileNumber": "202020",
        "SimNumber": null,
        "Email": null,
        "PhoneNumber": null,
        "Name": "TestTestRestaurant,Ammar,Hamed",
        "ID": 19
    }
]

我要从中获取实例的类是：

the class I want to get instances from is:

@interface Restaurant : NSObject
@property (nonatomic,strong) NSString *ID;
@property (nonatomic,strong) NSString* FirstName;
@property (nonatomic,strong) NSString* LastName;
@property (nonatomic,strong) NSString* MobileNumber;
@property (nonatomic,strong) NSString* simNumber;
@property (nonatomic,strong) NSString* PhoneNumber;
@property (nonatomic,strong) NSString* Name;
@end

最好的办法是什么，对不起，请问我的问题是来自基础知识，但我是新来的客观C

what is the best way to do that,excuse me maybe the question is from basic Knowledge but I am new to objective C

谢谢您的时间。

推荐答案

我建议为 Restaurant 类实现一个init方法。

I would suggest to implement an init method for your Restaurant class.

-(instancetype) initWithParameters:(NSDictionary*)parameters
{
    self = [super init];
    if (self) {
        //initializations
        _validationCode = parameters[@"validationCode"]; // may be NSNull
        _firstName = [parameters[@"FirstName"] isKindOfClass:[NSNull class]] ? @"" 
                     : parameters[@"FirstName"];
        ...
    }
    return self;
}

注意：你可能有JSON Null的事实，使你的初始化有点阐述。当相应的JSON值为Null时，您需要决定如何初始化属性。

Note: the fact that you may have JSON Nulls, makes your initialization a bit elaborate. You need to decide how you want to initialize a property, when the corresponding JSON value is Null.

您的参数 dictionary将是来自服务器的JSON数组的第一级字典。

Your parameters dictionary will be the first level dictionary from the JSON Array which you got from the server.

首先，创建一个JSON表示，即JSON中的NSArray对象： / p>

First, create a JSON representation, that is a NSArray object from the JSON:

NSError* localError;
id restaurantsObjects = [NSJSONSerialization JSONObjectWithData:data 
                                                        options:0 
                                                          error:&localError];

IFF这没有失败，你的 restaurantsObjects 现在应该是 NSArray 对象，其中包含餐馆 NSDictionary s。

IFF this did not fail, your restaurantsObjects should now be an NSArray object containing the restaurants as NSDictionarys.

现在，可以直接创建一个 NSMutableArray ，它将填充 Restaurant 对象：

Now, it will be straight forward to create a NSMutableArray which will be populated with Restaurant objects:

NSMutableArray* restaurants = [[NSMutableArray alloc] init];
for (NSDictionary* restaurantParameters in restaurantsObjects) {
    Restaurant* restaurant = [Restaurant alloc] initWithParameters: restaurantParameters];
    [restaurants addObject:restaurant];
}

最后，您可以设置一个属性餐馆在某些控制器中：

and finally, you may set a property restaurants in some controller:

self.restaurants = [restaurants copy];

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