I understand that many similiar questions have been asked in the past - however, none of them exactly applies to my situation.
I am using the AudioKit framework in my app. I added the framework by copying the framework into the app directory and adding it to embedded binaries. It runs perfectly on the iOS simulators after the iPhone 5 simulator (i.e. 5S plus). However, when building for: earlier simulators; Generic iOS Device; and my device (which is an iPhone SE) I get the error (Class) is unavailable: cannot find swift declaration for this class where (Class) is every single AudioKit class in my code.
As per this answer I've checked the framework's Modules folder and the only files there are x86_64.swiftdoc and x86_64.swiftmodule. As I understand, to build for a real iOS device I need an arm64.swiftmodule. However, I cannot figure out how to create this file/where to find it.
The linked question would suggest that I need to change the framework's deployment target, but I can't figure out how to change it (or even where the framework's deployment target is stated).
I have tried creating a new xCode project, building it from the start for Generic iOS device, then adding the AudioKit framework - but I still get the same errors.
Finally decided to give up trying to make it work. Used Carthage instead - works perfectly. If anyone else has this issue - just use Carthage.