UIImageName
The name of an image to display during app launch.
Discussion
Provide a value for this key that’s the name of an image in your asset catalog. You use the same string for the value that you might use when calling the init(named:) initializer of UIImage. Because the image comes from your asset catalog, you can use slicing to provide a small image that works on many different platforms.
If you don’t specify an image, the display shows the background color, as given by the UIColorName key. The background color may also show through any transparency in your image.