Proper way to cancel effects?

[sillygoose]

Wondering the proper way to cancel effects when a feature is dismissed. The child feature will run various network queries or timers and when the feature is dismissed I would cancel any in-flight queries or timers.

The question is where in the child feature can I put the cancel code? If I use .onDisappear() the view is gone and I will get warnings like:

An "ifLet" at "MyRivian/Trips.swift:496" received a presentation action when destination state was absent. …

  Action:
    Trips.Action.destination(.presented(.monthlyEfficiency(.onDisappear)))

This is generally considered an application logic error, and can happen for a few reasons:

There isn't a SwiftUI-equivalent to the UIKit viewWillDisappear event so wondering how I can see that the feature is being dismissed and cancel any in-flight effects before it has disappeared. I did find some suggestions to drop down to UIKit and create a onWillDisappear() event but wondering if there are other ways.

[mbrandonw]

Hi @sillygoose, are you using the presentation tools that come with the library, such as PresentationState, PresentationAction, ifLet, etc? If so, those tools automatically cancel effects when a feature is dismissed. And if not, is there a reason not to?

[sillygoose]

I am changing everything over to the new presentation tools so that will be a nice side effect, one less issue to deal with.

[acosmicflamingo]

I 1000% love your username @sillygoose . Would you like to swap?

[sillygoose]

I would consider it but my Point-Free account is tied to it and I can't risk missing any episodes right now.

[acosmicflamingo]

Your response absolutely lives up to your username. Thank you and godspeed my good man goose.