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遵循代理：NSURLConnectionDataDelegate

-(void)fetchWebData:(id)sender{

    self.isLoading=YES;          NSString *urlStr=kRequestUrlStr(self.page);     NSURL *url=[NSURL URLWithString:urlStr];          NSURLRequest *request=[NSURLRequest requestWithURL:url];          self.connection=[NSURLConnection connectionWithRequest:request delegate:self];

}

#pragma mark - <NSURLConnectionDataDelegate> -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{     self.isLoading=NO;     NSLog(@"请求失败%@",error.localizedDescription); } -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{     NSHTTPURLResponse *httpResponse=(NSHTTPURLResponse *)response;     NSLog(@"响应头：%@",httpResponse.allHeaderFields);     NSLog(@"状态码：%ld",httpResponse.statusCode);     NSLog(@"数据总长度%lld",response.expectedContentLength);     [self.webData setLength:0]; } -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{     [self.webData appendData:data]; } -(void)connectionDidFinishLoading:(NSURLConnection *)connection{     self.isLoading=NO;     if ([[NSThread currentThread] isMainThread]) {         NSLog(@"主线程");     }          //解析下载的数据并放入dataArray     NSError *error=nil;     NSDictionary *dic=[NSJSONSerialization JSONObjectWithData:_webData options:NSJSONReadingMutableContainers error:&error];     if (self.page==1) {         [self.dataArray removeAllObjects];     }          NSArray *users=dic[@"users"];     for (NSDictionary *userDic in users) {         User *user=[[User alloc] init];         user.username=userDic[@"username"];         user.headimage=userDic[@"headimage"];         [self.dataArray addObject:user];         [user release];     }     [self.tableView reloadData];  }

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