Question

NSData *weatherData = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:@"our URL"]];
NSMutableDictionary *weatherDict = [NSJSONSerialization JSONObjectWithData:weatherData options:kNilOptions error:&error];

使用NSDATA对JSON数据进行Getiing是否正确？

Answer 1

For parser JSON better options use:
1) NSURLSession.  
2) AFNetworking .

Using above approve you can handle response  and error (If the request failed or encountered an error )

For  NSURLSession  : 

-(void)getJsonResponseFromServer : (NSString *)urlString  parameter :(NSDictionary*)parameter success : (void (^)(NSDictionary *responseDict))success failure:(void(^)(NSError* error))failure
{

    NSError* error=nil;
    NSURLSession * session = [NSURLSession sharedSession];

    NSURL * url = [NSURL URLWithString: urlString];


    NSData *postData = [NSJSONSerialization dataWithJSONObject:parameter options:0 error:&error];

//Create  URLReques
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                                                           cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                       timeoutInterval:60.0];



    [request addValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
   // [request addValue:@"application/json" forHTTPHeaderField:@"Accept"];


    // Set Method POST/GET
    [request setHTTPMethod:@"POST"];

    //set Parameter 
    [request setHTTPBody:postData];

    // Asynchronously Api is hit here

    NSURLSessionDataTask* dataTask=[session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {


        if (!error) //If error nil
        {
        //Serialization  data             
            NSDictionary * json  = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

            NSLog(@"json %@",json);

            success(json);
        }
        else
        {
            failure(error);
        }


    }];


    [dataTask resume] ; // Executed task


}

只需致电：

NSDictionary* paramDict=@{@“paramterName”:@“value”};

    [self getJsonResponseFromServer:@BaseURL parameter:paramDict success:^(NSDictionary *responseDict)
    {

        NSLog(@"responce %@",responseDict);

    } failure:^(NSError *error)
    {
        // error handling here ...

         NSLog(@"error %@",error.description);

    }];

为了更好地理解NSURLSession Class Reference，请参阅：

将URL转换为NSDATA并解析JSON是否正确？

1 个答案: