renderingMode on UIImage is a read-only property: https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIImage_Class/#//apple_ref/occ/instp/UIImage/renderingMode

As a result of this the icon will always be gray on the tab view on iOS.

You guys are trying to set it here, but it doesn't work:

The correct way is to use imageWithRenderingMode.