URL请求并解析JSON数据

    

   [ SVProgressHUD showWithStatus : @" 加载中 ..." ];

    NSURL *url = [NSURL URLWithString:stringUrl];

    NSURLRequest *request = [ NSURLRequest requestWithURL :url];
    NSOperationQueue *operatonQueue = [ NSOperationQueue mainQueue ];
    [ NSURLConnection sendAsynchronousRequest :request queue :operatonQueue completionHandler :^( NSURLResponse *response, NSData *data, NSError *connectionError) {
        if (!connectionError) {
            [ SVProgressHUD dismiss ];

            NSDictionary *cateDict  = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

            // 返回NSDictionay或者NSArray
        } else {
            [ SVProgressHUD showErrorWithStatus :[connectionError localizedDescription ]];
        }
       

    }];

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