A brief list of notable differences
- The bundle identifier for the macOS version of your app is different. If you use bundle identifiers for something specific, be aware of this
- KeyChain sharing differs briefly, as outlined by Apple here (search for "macOS" on that page)
- Custom multitouch behaviour can't be automated. Views have to be updated for that
- Your app will not be killed if it consumes too much memory. The system will just swap
With Catalyst, you should use the newever versions of these old, deprecated, frameworks:
- AddressBook -> Contacts
- AddressBookUI -> ContactsUI
- AssetsLibrary -> Photos
- OpenGL ES -> Metal
- GLKit -> MetalKit
- UIWebView -> WKWebView
