NSURLSession实践（结合POST和GET请求JSON和XML数据）

GET方法解析JSON数据，使用NSJSONSerialization

 1     NSString *appkey = @"bf1d95bd730f031fb019ba80ffabb89d";
 2     NSString *baseURL = @"http://op.juhe.cn/onebox/weather/query";
 3     NSString *url = [baseURL stringByAppendingString:[NSString stringWithFormat:@"?cityname=%@&dtype=&key=%@", @"上海", appkey]];
 4     NSString *urlStr = [url stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
 5     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlStr]];
 6     request.HTTPMethod =@"GET";
 7     request.timeoutInterval = 20;
 8     request.cachePolicy = NSURLRequestReturnCacheDataElseLoad;
 9     
10     NSURLSession *session = [NSURLSession sharedSession];
11     NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
12         NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
13         NSLog(@"%@", [dict allKeys]);
14     }];
15     [task resume];

POST方法解析JSON数据，使用NSJSONSerialization，其他参数和之前一样

 1     //设置请求体
 2     NSString *bodyStr = [NSString stringWithFormat:@"cityname=%@&dtype=&key=%@", @"上海", appkey];
 3     NSString *body = [bodyStr stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
 4     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:baseURL]];
 5     request.HTTPBody = [body dataUsingEncoding:NSUTF8StringEncoding];
 6     request.HTTPMethod =@"POST";
 7     request.timeoutInterval = 20;
 8     request.cachePolicy = NSURLRequestReturnCacheDataElseLoad;
 9     
10     NSURLSession *session = [NSURLSession sharedSession];
11     NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
12         NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
13         NSLog(@"%@", [dict allKeys]);
14     }];
15     [task resume];

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原文地址：https://www.cnblogs.com/xiayao/p/5265672.html