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Icon and Image Sizes
Every app needs an app icon and a launch file or image. In addition, some apps need custom icons to represent app-specific content, functions, or modes in navigation bars, toolbars, and tab bars.
Unlike other custom artwork in your app, the icons and images listed in Table 39 ...
升级到ios7后，icon图标增多，在此做一下小结。
如上图所示，表面看似16个图标，其实只有13个尺寸
除上述这13个尺寸之外还需要一个1024x1024大小的图标文件，png或jpg格式都可以，这个是用于网站上传时必须的文件。
具体请参见官方文档：https://developer.apple.com/library/ios/qa/qa1686/_index.html