Enabling binding to the device motion sensor

MotionEffect.swift

struct MotionEffectModifier: ViewModifier {
    @ObservedObject private(set) var manager = MotionManager.shared
    @Binding var pitch: Double
    @Binding var roll: Double
    let magnitude: Double

    func body(content: Content) -> some View {
        content
            .onAppear { manager.startUpdate() }
            .onDisappear { manager.stopUpdate() }
            .onChange(of: pitch) { pitch = $0 }
            .onChange(of: roll) { roll = $0 }
    }
}

extension View {
    func motionEffect(pitch: Binding<Double>, roll: Binding<Double>, magnitude: Double = 1) -> some View {
        modifier(MotionEffectModifier(pitch: pitch, roll: roll, magnitude: magnitude))
    }
}