Explore game input in visionOS

// Respond to a tap gesture.

struct ContentView: View {
  var body: some View {
    RealityView { content in
      // For entity targeting to work, entities must have an InputTargetComponent
      // and a CollisionComponent!
    }
    .gesture(TapGesture().targetedToAnyEntity().onEnded { value in
      print("Tapped entity \(value.entity)!")
    })
  }
}

// Gesture combining dragging, magnification, and 3D rotation all at once.
var manipulationGesture: some Gesture<AffineTransform3D> {
  DragGesture()
    .simultaneously(with: MagnifyGesture())
    .simultaneously(with: RotateGesture3D())
    .map {bgesture in
      let (translation, scale, rotation) = gesture.components()

      return AffineTransform3D(
        scale: scale,
        rotation: rotation,
        translation: translation
      )
    }
}

// Create and detect a custom circle gesture.

// Get all required joints and check if they are tracked.
let leftHandIndexFingerTip = leftHandAnchor.skeleton.joint(named: .handIndexFingerTip)
// ...
// Get the position of all joints in world coordinates.
let leftHandIndexFingerTipWorldPosition = matrix_multiply(leftHandAnchor.originFromAnchorTransform, 
                leftHandIndexFingerTip.anchorFromJointTransform).columns.3.xyz
// ...
   
// Circle gesture detection is true when the distance between the index finger tips centers
// and the distance between the thumb tip centers is each less than four centimeters.
let isCircleShapeGesture = indexFingersDistance < 0.04 && thumbsDistance < 0.04
if isCircleShapeGesture {
  // respond to gesture
}

// Detect connected game controller.

// Add handler for when controller connects.
    NotificationCenter.default.addObserver(
	      forName: NSNotification.Name.GCControllerDidConnect,
  	    object: nil, queue: nil) {
    	      (note) in
      	      guard let _controller = note.object? as GCController else { return }
        	    // Add controller input change handlers.
          	  _controller.physicalInputProfile[GCInputButtonA]?.valueChangedHandler = {
            	  //... 
            	}
       	}

// Poll for controller input
    if controller.physicalInputProfile[GCInputButtonA]?.pressed {... }
    if controller.physicalInputProfile[GCInputButtonB]?.pressed {... }

// Tag a RealityView to handle controller input.

struct ContentView: View {
  var body: some View {
    RealityView { content in
      // Tag your RealityView to respond to controller input events.
    }
    .handlesGameControllerEvents(matching .gamepad)
  }
}