Swift Package Manager platform-specific resources: iOS xibs do not support target device type 'mac'

Question

I am building a library using Swift Package Manager. I have added a XIB file to define the layout of a custom UICollectionViewCell. My package will not compile in Xcode, because the XIB file is specific to iOS. If I create a macOS XIB, then the opposite error occurs. This seems to be because:

1. Libraries built by Swift Package Manager will always be cross-platform, and so I can't build an "iOS-only" package.
2. Code can use mechanisms like #if os(iOS) to handle platform-specific code.
3. resources: [ .process("resource.name") ] has no BuildSettingCondition to tell it to include a specific XIB file only when building for iOS.
4. .xib is handled automatically by Xcode, without being declared in Package.swift because it's obvious that they're resource files and so Xcode handles them automatically.
5. xcodebuild doesn't seem to have rules which separate the two different .xib files for platform-specific processing.

What am I missing? How can I ensure that iOS-specific resources are not forced to be included in the final package?

Answer 1

Under the build settings change the target from what ever the value is, to "Any iOS Type"