I'm having an issue on iPhoneX using XCode9.2 but I have no issue running the app using XCode8.
From my findings are the UITabBar height is set at 49.
UITabBarButton height is 14 for iPhoneX but UITabBarButton is 49 for iPhone 6
Any ideas how to resolve this in XCode9?
Here's how it's displaying on iPhone X:
And here's how it's displaying on iPhone 6: