13、对数据请求进行封装

#import "NetWorkingHelper.h"



@implementation NetWorkingHelper

+(NSData*)dicTransformDataWithDic:(NSDictionary*)dic{
    
    NSMutableArray* mArray=[NSMutableArray array];
    if (dic && dic.count) {
        for (NSString* key in dic) {
            NSString* str=[NSString stringWithFormat:@"%@=%@",key,dic[key]];
            [mArray addObject:str];
           
        }
        NSString* resultStr=[mArray componentsJoinedByString:@"&"];
        return [resultStr dataUsingEncoding:NSUTF8StringEncoding];
    }else{
        
        return nil;
    }
    
}



//外部调用的方法
+(void)requestWithType:(RequestType)type url:(NSString*)url parameters:(NSDictionary*)parameters success:(Success)success failure:(Failure)failure{
    //会话管理对象
    NSURLSession* session=[NSURLSession sharedSession];
    NSMutableURLRequest* req=nil;
    NSURLSessionDataTask* task=nil;
    //设置请求参数
   
    if (type==GET) {
        NSString* parString=[[NSString alloc] initWithData:[self dicTransformDataWithDic:parameters] encoding:NSUTF8StringEncoding ];
        if (parString) {
            url=[url stringByAppendingFormat:@"?%@",parString]; 
        }
       
        req=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
        req.HTTPMethod=@"GET";
        
        
    }else{
       req.HTTPMethod=@"POST";
        req=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
         req.HTTPBody=[self dicTransformDataWithDic:parameters];
    }
    task=[session dataTaskWithRequest:req completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        if (error) {
            if (failure) {
                //请求失败
                failure(task,error);
            }
        }else{
            //请求成功
            id result=[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
            if (success) {
                success(task,result);
            }
        }
        
    }];
    //启动任务
    [task resume];
  
}


@end

在其他类中调用即可，例如：

- (void)viewDidLoad {
    [super viewDidLoad];
    NSString* url=@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20151101&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
  [NetWorkingHelper requestWithType:GET url:url parameters:nil success:^(NSURLSessionTask *task, id responseObject) {
      if (responseObject) {
          NSLog(@"请求成功----%@",responseObject);
      }
      
  } failure:^(NSURLSessionTask *task, NSError *error) {
      if (error) {
          
          NSLog(@"请求失败---%@",error.description);
      }
      
  }];
}