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User can delete some Core Data in NavigationLink. How to save it when back button clicked and return to NavigationView?

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You can do it in the onAppear method of the previous View in the NavigationalStack.

struct ContentView: View {
    @Environment(\.managedObjectContext) var managedObjectContext
    var body: some View {
        Text("")
            .onAppear {
                do {
                    try self.managedObjectContext.save()
                } catch {
                    // handle the Core Data error
                }
        }
    }
}
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