ShakeModifier.swift

import SwiftUI
import Combine

private let motionShaked = PassthroughSubject<Void, Never>()

extension UIWindow {
     open override func motionEnded(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
        if motion == .motionShake {
            motionShaked.send()
        }
     }
}

private struct ShakeViewModifier: ViewModifier {
    let action: (() -> Void)

    init(perform action: @escaping (() -> Void)) {
        self.action = action
    }

    func body(content: Content) -> some View {
        content
            .onAppear {
            }
            .onReceive(motionShaked.receive(on: RunLoop.main)) {
                action()
            }
    }
}

extension View {
    public func onShake(perform action: @escaping (() -> Void)) -> some View {
        return self.modifier(ShakeViewModifier(perform: action))
    }
}