For example,
- Operation A both fetches model data over the network and updates a
UICollectionViewbackedby it. - Operation B filters model data.
What is a good approach to executing B only after A is finished?
What is the simplest approach to execute a Swift statement only after an asynchronous operation finishes?
Usually it is to call operation B in completion handler of operation A.
You can also use Combine, which has various ways of dealing with your scenario - especially if the filtering also needs to be done asynchronously. I use Combine a lot with SwiftUI apps, because Combine’s Publishers can trigger a SwiftUI View’s .onReceive.