UILaunchStoryboards
The launch storyboard to use to generate a launch image when your app opens from a supported scheme.
Discussion
Use UILaunchStoryboards when you want your app to show a different launch screen for different schemes. The schemes are the ones specified in your app’s CFBundleURLTypes. You can also specify a default launch storyboard.
If your app has a single launch storyboard, use the simpler UILaunchStoryboardName instead.