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Introduction
Brandon:
Thanks to the new Observation tools in Swift 5.9 we have now gotten rid of 4 specialized view helpers that previously existed only to aid in minimizing view re-computation. They are WithViewStore
, IfLetStore
, SwitchStore
and CaseLet
. We now get to use simpler, more vanilla Swift code to constructs these views, and they still minimally observe only the state that is touched in the view.
Stephen:
But there’s another really powerful and popular view helper that ships with the library that allows you to decompose complex list-based features into smaller units, and that’s the ForEachStore
. With it you can easily transform a store of some collection of features into individual stores for each element in the collection. This allows you to have a dedicated, isolated Composable Architecture feature for each row in a list.
It would be amazing if we could get rid of this concept too, and just use a vanilla SwiftUI ForEach
view. Well, this is absolutely possible, and it greatly simplifies the way one deals with lists in the Composable Architecture.
Let’s take a look.
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