Missing Type UIEvent? - swift

Question

I'm using XCode 10.2 with SpriteKit and swift 5 to create a Mac Application, and I cannot for the life of me find a working example of handling click events on a node.
The most updated info I can find suggests using the following:
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) { }
But XCode errors, saying
Use of undeclared type 'UIEvent'
Use of undeclared type 'UITouch'
I'm not sure how to proceed cause all the info I find suggests using the above code. Everything else is working OK so far though. Here is my GameScene Class:
import SpriteKit
class GameScene: SKScene {
var circle: SKShapeNode = SKShapeNode();
var label: SKLabelNode = SKLabelNode();
var ground: SKShapeNode = SKShapeNode();
/**
* Did Move Callback
*/
override func didMove(to view: SKView) {
initGround(view: view);
initLabel(view: view);
let recognizer = NSClickGestureRecognizer(target: self, action: #selector(tap));
view.addGestureRecognizer(recognizer);
}
/**
* Click Handler
*/
#objc func tap(recognizer: NSGestureRecognizer) {
let viewLocation = recognizer.location(in: view);
let sceneLocation = convertPoint(fromView: viewLocation);
addCircle(view: view!, position: sceneLocation);
}
// Not Working
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
}
/**
* Init Ground
*/
func initGround(view: SKView) {
let path = CGMutablePath();
path.move(to: CGPoint(x: 0, y: 30));
path.addLine(to: CGPoint(x: view.frame.width, y: 30));
path.addLine(to: CGPoint(x: view.frame.width, y: view.frame.height));
path.addLine(to: CGPoint(x: 0, y: view.frame.height));
path.addLine(to: CGPoint(x: 0, y: 30));
ground.path = path;
ground.lineWidth = 5;
ground.strokeColor = SKColor.brown;
let borderBody = SKPhysicsBody(edgeLoopFrom: path);
borderBody.friction = 5;
self.physicsBody = borderBody;
addChild(ground);
}
/**
* Add Label
*/
func initLabel(view: SKView) {
label = SKLabelNode(text: "No Gravity");
label.name = "no gravity button";
label.position = CGPoint(x: label.frame.width / 2, y: 5);
label.fontSize = 12;
label.fontColor = SKColor.yellow;
label.fontName = "Avenir";
label.isUserInteractionEnabled = true;
addChild(label);
}
/**
* Add Circle
*/
func addCircle(view: SKView, position: CGPoint) {
let size = Int.random(in: 1 ..< 50);
let color = getRandomColor();
circle = SKShapeNode(circleOfRadius: CGFloat(size));
// Set Position
circle.position = position;
// Set Physics
circle.physicsBody = SKPhysicsBody(circleOfRadius: CGFloat(size));
circle.physicsBody?.affectedByGravity = false;
circle.physicsBody?.usesPreciseCollisionDetection = true;
circle.physicsBody?.restitution = 1; //0.8
circle.physicsBody?.linearDamping = 0;
circle.physicsBody?.friction = 0; //0.2
circle.physicsBody?.isDynamic = true;
circle.physicsBody?.mass = CGFloat(size);
circle.physicsBody?.allowsRotation = true;
circle.physicsBody?.velocity = CGVector(dx: 0, dy: -1000);
circle.strokeColor = color;
circle.glowWidth = 1.0;
circle.fillColor = color;
addChild(circle)
}
func getRandomColor() -> SKColor {
return SKColor(red: .random(in: 0...1),
green: .random(in: 0...1),
blue: .random(in: 0...1),
alpha: 1.0)
}
}
Does anyone have experience with using Swift 5 and handling clicks / touches in SpriteKit? Or maybe just why XCode says that UIEvent and UITouch aren't real things?
Thanks!

Answer 1

On Mac, you’ll implement
-(void)mouseDown:(NSEvent *)theEvent {
}
- (void)mouseUp:(NSEvent *)theEvent {
}
- (void)mouseExited:(NSEvent *)theEvent {
}
In each case you will call
CGPoint loc = [theEvent locationInNode:self];
to learn where the click happened within the scene.

Answer 2

User Martin R pointed out the UIEvent and UITouch classes are included only in iOS projects. I'm creating a Mac Application, what I didn't realize was that I already had the click handler in my GameScene class:
override func didMove(to view: SKView) {
let recognizer = NSClickGestureRecognizer(target: self, action: #selector(click));
view.addGestureRecognizer(recognizer);
}
This registers a callback to a click handler, which I already had defined:
/**
* Click Handler
*/
#objc func tap(recognizer: NSGestureRecognizer) {
let viewLocation = recognizer.location(in: view);
let sceneLocation = convertPoint(fromView: viewLocation);
let touchedNode = self.atPoint(sceneLocation);
if let name = touchedNode.name {
if name == "no gravity button" {
print("Touched")
}
}
addCircle(view: view!, position: sceneLocation);
}
I was able to get the clicked node name and act upon it as I originally intended.