I have the same problem. I tried:
- move the .png file to Images.xcassets. to fail.
- Create a new version of LaunchFile.storyboard. to fail.
- .png. ,
Build & ( Run ) ,
. (
Xcode )
- LaunchFile.storyboard . LaunchFile
, .
, , ( , 100 , ).
- .png. .png , File > Save for web (Command + Option + Shift + S), , , .png . , , .
, .png .