UIAppearance Swift 4
Right - the current Swift 4 conversion tool (as of Xcode 9 Beta 4) gets a little carried away.
I was able to fix the problem quickly by reverting the UIAppearance conversion code, then updating the individual attributes.
For example, in Swift 3 I had:
UITabBarItem.appearance().setTitleTextAttributes([NSForegroundColorAttributeName: UIColor.white], for: .selected)Xcode "helped" me out by changing it to:
UIAppearance.appearance().setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor.white], for: .selected)I was able to quiet the errors by half-reverting, to:
UITabBarItem.appearance().setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor.white], for: .selected)