ios - How to change UIToolbar button icons to hi-res on a Universal app if the device supports retina display?

Question

I am working on a Universal app, there is a UIToolbar with the 20x20px icon as images, but I need to switch this to their hi-res counterpart (40x40px) if the device supports retina display, any tips how can I achieve this?

Answer 1

用“@2x”命名高分辨率图标，它们将被自动使用。