I have a tabbed application project I am working on in Xcode written in Swift (Xcode 6.3 and Swift 1.2
). I am having a lot of trouble with custom Tab Bar icons. I
It sounds like you have everything set up properly in xCode. The problem IS the png file you are using.
Download this image, http://i.stack.imgur.com/zluev.png , and see if the problem persists.
According to an answer on UITabBarItem images just appear as a grey block:
The standard tabbar icons in iOS are rendered solely from the alpha channel. Colors are ignored completely. Instead of colors you can use different alpha values that lead to a different shade of gray (or blue if selected)
Make the background of your icons transparent.