iPhone Simulator, SpriteKit

Hello everyone, does anyone know how to fix this problem? When I run iPhone simulator, physics for sprites and touches doesn't work, however on real device everything is fine.

Also the error still appears: Immutable value 'touch' was never used; consider replacing with '_' or removing it

Code Block import SpriteKit
class GameScene: SKScene, SKPhysicsContactDelegate {
   
  var knife = SKSpriteNode(imageNamed: "knife")
  var target = SKSpriteNode(imageNamed: "target")
   
  override func didMove(to view: SKView) {
    physicsBody = SKPhysicsBody(edgeLoopFrom: frame)
    physicsWorld.contactDelegate = self
     
    spawnKnife()
    spawnTarget()
  }
   
  func spawnKnife() {
    knife.texture?.filteringMode = .nearest
    knife.size = CGSize(width: 256, height: 256)
    knife.position = CGPoint(x: 0, y: UIScreen.main.bounds.minY - 300)
    knife.physicsBody = SKPhysicsBody(texture: knife.texture!, size: knife.size)
    knife.physicsBody?.isDynamic = true
     
    addChild(knife)
  }
   
  func spawnTarget() {
    target.texture?.filteringMode = .nearest
    target.size = CGSize(width: 512, height: 256)
    target.position = CGPoint(x: 0, y: UIScreen.main.bounds.maxY - 128)
    target.physicsBody = SKPhysicsBody(texture: target.texture!, size: target.size)
    target.physicsBody?.isDynamic = false
     
    addChild(target)
  }
   
  override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    for touch in touches {
      knife.physicsBody?.applyImpulse(CGVector(dx: 0, dy: 1000))
    }
  }