异步GEI (1)

将网址初始化成一个OC字符串对象.

    NSString * urlString = @"http://p_w_picpath.zcool.com.cn/56/13/1308200901454.jpg";
    NSString * newUrlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
   

构建网络URL对象

    NSURL * URL = [NSURL URLWithString:newUrlString];
   

创建网络请求

    NSURLRequest * request = [NSURLRequest requestWithURL:URL cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:10];

创建异步连接

    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
      

解析

       NSDictionary * dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
       NSLog(@"%@",dic);
        
       self.p_w_picpathView.p_w_picpath = [UIImage p_w_picpathWithData:data];
  }];