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Currently Swift Package Manager for Xcode11 can only build static libraries. This means that UIKit can't be linked dynamically, so we need to check if UIKit is available and import it if possible. “canImport” is available from Swift 4.1, so these changes won’t cause any compiling issues and everything will work correctly (Carthage, Pods, etc). Since it's CRITICAL to make this lib Swift Package Manager compatible for appleOS platforms, could you please merge this pull request as soon as possible?