how can swiftui tabview detect a click on a tab?

As of iOS 14 you can use onChange to execute code when a state variable changes. You can replace your tap gesture with this:

.onChange(of: selectedTab) { newValue in
    model.myFunction(item: newValue)
}

If you don’t want to be restricted to iOS 14 you can find additional options here: How can I run an action when a state changes?

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