Why is a Launch Image needed despite having a Lauch Screen File?

Question

In iOS 10 I used a Launch Screen File instead of Launch Images:

After converting to Swift 4 in Xcode 9 for iOS 11 I get the following warning:

Missing "[email protected]" launch image

Why is a launch image needed when there is already the launch screen?

Viveca

Your answer can be found in the link below Your Answer – Vermilion

@MonwellPartee Launch Images are not required when there are Launch Screens. It seems to be a bug in Xcode, see my answer below. – Viveca

I agree, seems to be a bug since Launch Images are now deprecated but still shows up. – Crotch

Answer 1

The solution was to temporarily add a launch image asset catalog.

1. Click on Use Asset Catalog...:

2. Choose to create a new asset catalog:

3. Switch back to Don't use asset catalogs:

4. Delete the automatically created Images.xcassets.

5. The warning is gone.

Viveca

Do you know what difference this makes to the xcodeproj? – Boggers

@Boggers It apparently clears our artifacts. Which exactly I don't know as I cannot reproduce the bug to get those artifacts. However, the procedure in the solution seems to be safe. No problems since then. – Viveca

This doesnt work with Xcode 11 / iOS 13 because the launch images source is now gone. – Crotch

Answer 2

In Xcode 9.4, if we click on iOS 8.0 and later, LaunchImage will show up a slot called iPhone X Portrait iOS 11+

You need to refer to Static Launch Screen Images guide https://developer.apple.com/design/human-interface-guidelines/ios/icons-and-images/launch-screen/. Here is the sizes for iPhone X

iPhone X    portrai 1125px × 2436px landscape 2436px × 1125px

Shellans

The question title did not fully reflect the question content, so I updated it. The question is: why is a Launch Image needed despite already having a Lauch Screen File? As you see in my answer, it was due to a bug in Xcode that messed up the project settings. – Viveca