onCadence

Cadence.swift

struct CadenceViewModifier: ViewModifier {
    let timeInternal: Double
    let action: () -> Void
    
    @State var lastFire: Date?
    func body(content: Content) -> some View {
        content
            .onAppear() // https://stackoverflow.com/questions/61190398/swiftui-viewmodifier-doesnt-listen-to-onreceive-events
            .onReceive(Timer.publish(every: timeInternal + (lastFire?.timeIntervalSinceNow ?? 0), on: .main, in: .default).autoconnect())  { _ in
                self.lastFire = Date()
                action()
            }
    }
}

extension View {
    func onCadence(timeInterval: Double, action: @escaping () -> ()) -> some View {
        modifier(CadenceViewModifier(timeInternal: timeInterval, action: action))
    }
}