Adds shake gesture view modifier (#64)

Adds shake gesture view modifier implementing override on motionEnded on UIWindow using NotificationCenter to broadcast motion detection

Sources/UIExtensions/Extensions/UIWindow+MotionEnded.swift

@@ -0,0 +1,19 @@
+// Copyright © 2023 Lautsprecher Teufel GmbH. All rights reserved.
+
+import UIKit
+
+extension NSNotification.Name {
+    public static let didShakeDevice = NSNotification.Name("DidShakeDeviceNotification")
+}
+
+extension UIWindow {
+    override open func motionEnded(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
+        super.motionEnded(motion, with: event)
+
+        switch event?.subtype {
+        case .motionShake:
+            NotificationCenter.default.post(name: .didShakeDevice, object: event)
+        default: break
+        }
+    }
+}

Sources/UIExtensions/ViewModifiers/ShakeGestureViewModifier.swift

@@ -0,0 +1,19 @@
+// Copyright © 2023 Lautsprecher Teufel GmbH. All rights reserved.
+
+import SwiftUI
+
+struct ShakeGestureViewModifier: ViewModifier {
+  let action: () -> Void
+
+  func body(content: Content) -> some View {
+    content.onReceive(NotificationCenter.default.publisher(for: .didShakeDevice)) { _ in
+        action()
+    }
+  }
+}
+
+extension View {
+  public func onShakeGesture(perform action: @escaping () -> Void) -> some View {
+    self.modifier(ShakeGestureViewModifier(action: action))
+  }
+}