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Elethom @
puttin 应该是这里:
https://developer.apple.com/library/ios/documentation/userexperience/conceptual/MobileHIG/BarIcons.html#//apple_ref/doc/uid/TP40006556-CH21-SW1如下:
* Simple and streamlined. Too many details can make an icon appear sloppy or indecipherable.
* Readily understood and widely acceptable. Strive to create a symbol that most users will interpret correctly and that no users will find offensive.
* If you’re designing a custom tab bar icon, you should provide two versions—one for the unselected appearance and one for the selected appearance. The selected appearance is often a filled-in version of the unselected appearance, but some designs call for variations on this approach.