Unlock This Episode
Our Free plan includes 1 subscriber-only episode of your choice, plus weekly updates from our newsletter.
So, we think it’s pretty incredible how easy it is to add new features to an existing navigation stack. It only took about 3 steps: you add the feature’s domain to the
Path reducer, you add a scope to the
Path reducer’s body, and finally you add the view to the
NavigationStackStore’s destination closure.
And once you complete those few steps you get immediate and infinite introspection into everything that is happening in the feature when it is on the stack. This includes being able to traverse and aggregate data across the elements of the stack, and the ability to see every single action sent into the child feature.
Stephen: But, as amazing as this all seems, there are some serious problems lurking in the shadows, and they are reminiscent of what we experienced with our presentations APIs for sheets, popovers and covers.
One of the big problems we saw with those forms of navigation, and in particular the
ifLet operator, is that when the child feature was dismissed, its effects were not cancelled. That allowed effects to continue feeding data into the system even long after the child feature had gone away.
This problem also exists in our navigation stack, and the
forEach operator, so let’s see how it can happen and what it takes to fix it.
Subscribe to Point-Free
Access this episode, plus all past and future episodes when you become a subscriber.
Already a subscriber? Log in
Composable navigation beta GitHub discussionBrandon Williams & Stephen Celis • Monday Feb 27, 2023
In conjunction with the release of episode #224 we also released a beta preview of the navigation tools coming to the Composable Architecture.