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我正在开发 youtube IOS 应用程序。我想得到响应的视频图像。

这是响应部分，

"media:thumbnail" =         (
                        {
                "@height" = 360;
                "@time" = "00:00:51.500";
                "@url" = "http://i.ytimg.com/vi/S8OG7dN-66Q/0.jpg";
                "@width" = 480;
            },
                        {
                "@height" = 90;
                "@time" = "00:00:25.750";
                "@url" = "http://i.ytimg.com/vi/S8OG7dN-66Q/1.jpg";
                "@width" = 120;
            },
                        {
                "@height" = 90;
                "@time" = "00:00:51.500";
                "@url" = "http://i.ytimg.com/vi/S8OG7dN-66Q/2.jpg";
                "@width" = 120;
            },
                        {
                "@height" = 90;
                "@time" = "00:01:17.250";
                "@url" = "http://i.ytimg.com/vi/S8OG7dN-66Q/3.jpg";
                "@width" = 120;
            }
        );

我想获得@url 标签值，但我没有

谢谢

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