Am using SKIE's `Observing` and wondering if there should be way to run some swift code/create some ...

# touchlab-tools

[John O'Reilly]

Am using SKIE's Observing and wondering if there should be way to run some swift code/create some derived state based on result of that?

[John O'Reilly]

I tried following for example but onChange not getting triggered

Observing(someState) { value in

}.onChange(of: someState.value) { oldValue, newValue in
    print("Changing from \(oldValue) to \(newValue)")
}

[Filip Dolník]

Hi! I think that you want to do the following:

Text("Manually updated counter: \(manuallyUpdatedCounter)")
            .collect(flow: viewModel.counter) { latestValue in
                manuallyUpdatedCounter = latestValue.intValue
            }

[Filip Dolník]

(If I recall correctly, onChange is supposed to be used together with things like Binding, ObservableObject, etc. bounded to the given View - which the someState.value most likely isn’t)

[John O'Reilly]

Yeah not too specifically focussed on using onChange ....more how to do run that logic when it changes

[John O'Reilly]

I went back to using for await in .task view modifier

[Filip Dolník]

Give a try to the collect function.

[John O'Reilly]

Just tried that and it worked great, thanks!