UILaunchScreenDefinitions
A collection of launch screen configuration dictionaries.
Discussion
Each dictionary in the array resembles the one you might define for the UILaunchScreen key, with the addition of a UILaunchScreenIdentifier key that provides a unique identifier for the dictionary. You use that identifier when associating to the dictionary with a URL scheme in the UIURLToLaunchScreenAssociations array, or to indicate it as the default launch screen with the UIDefaultLaunchScreen key.