Apple has slowly started bringing out frameworks that are Swift only, and in addition the SwiftUI runtime is... well, Swift only. All the old ObjC stuff still

Apple has slowly started bringing out frameworks that are Swift only, and in addition the SwiftUI runtime is... well, Swift only. All the old ObjC stuff still works, though, there's nothing stopping you using it. I released an app recently that was 50/50 ObjC/Swift (for a few weird reasons) recently and it's really painless in comparison to some other modern stacks.