UILaunchStoryboardName
The filename of the storyboard from which to generate the app’s launch image.
Discussion
Specify the name of the storyboard file without the filename extension. For example, if the filename of your storyboard is LaunchScreen.storyboard, specify “LaunchScreen” as the value for this key.
If you prefer to configure your app’s launch screen without storyboards, use UILaunchScreen instead.