How to fix SKPhysicsContactDelegate not being called - swift

Question

My sprites are supposed to contact each other and print to console, however, one goes behind the other and they do not actually touch. Needless to say, nothing is being printed to console.
I've tried using many different "types" of if statements in the function, however, none of them have worked. For example, I've tried using:
if bodyA.categoryBitMask == 1 && bodyB.categoryBitMask == 2 || bodyA.categoryBitMask == 2 && bodyB.categoryBitMask == 1
as well as:
if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask
Help would be much appreciated! :)
import SpriteKit
import GameplayKit
class GameScene: SKScene, SKPhysicsContactDelegate {
var e = SKSpriteNode()
var square = SKSpriteNode()
var timer:Timer!
let squareCategory:UInt32 = 0x1 << 1
let eCategory:UInt32 = 0x1 << 2
override func didMove(to view: SKView) {
self.physicsWorld.contactDelegate = self
square = SKSpriteNode(imageNamed: "square")
square.size = CGSize(width: 100, height: 100)
square.physicsBody = SKPhysicsBody(rectangleOf: square.size)
square.position = CGPoint(x: 0, y: -590)
square.physicsBody = SKPhysicsBody(rectangleOf: e.size)
square.name = "square"
square.physicsBody?.categoryBitMask = squareCategory
square.physicsBody?.contactTestBitMask = eCategory
square.physicsBody?.usesPreciseCollisionDetection = true
self.addChild(square)
let swipeRight: UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(GameScene.swipedRight(sender:)))
swipeRight.direction = .right
view.addGestureRecognizer(swipeRight)
let swipeLeft: UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector (GameScene.swipedLeft(sender:)))
swipeLeft.direction = .left
view.addGestureRecognizer(swipeLeft)
timer = Timer.scheduledTimer(timeInterval: 2, target: self, selector: #selector(self.adde), userInfo: nil, repeats: true)
}
#objc func swipedRight(sender: UISwipeGestureRecognizer) {
//middle
if square.position == CGPoint(x: 0, y: -590) {
square.position = CGPoint(x: 200, y: -590)
}
//left
if square.position == CGPoint(x: -200, y: -590) {
square.position = CGPoint(x: 0, y: -590)
}
}
#objc func swipedLeft(sender: UISwipeGestureRecognizer) {
//middle
if square.position == CGPoint(x: 0, y: -590) {
square.position = CGPoint(x: -200, y: -590)
}
//right
if square.position == CGPoint(x: 200, y: -590) {
square.position = CGPoint(x: 0, y: -590)
}
}
#objc func adde() {
e = SKSpriteNode(imageNamed: "e")
let ePosition = GKRandomDistribution(lowestValue: -414, highestValue: 414)
let position = CGFloat(ePosition.nextInt())
e.size = CGSize(width: 75, height: 75)
e.position = CGPoint(x: position, y: 640)
e.physicsBody = SKPhysicsBody(rectangleOf: e.size)
e.name = "e"
e.physicsBody?.categoryBitMask = eCategory
e.physicsBody?.contactTestBitMask = squareCategory
e.physicsBody?.isDynamic = true
self.addChild(e)
let animationDuration:TimeInterval = 6
var actionArray = [SKAction]()
actionArray.append(SKAction.move(to: CGPoint(x: position, y: -705), duration: animationDuration))
actionArray.append(SKAction.removeFromParent())
e.run(SKAction.sequence(actionArray))
}
func didBegin(_ contact: SKPhysicsContact) {
let bodyAName = contact.bodyA.node?.name
let bodyBName = contact.bodyB.node?.name
if bodyAName == "square" && bodyBName == "e" || bodyAName == "e" && bodyBName == "square"{
if bodyAName == "square" {
contact.bodyA.node?.removeFromParent()
} else if bodyBName == "e" {
contact.bodyB.node?.removeFromParent()
}
}
}
override func update(_ currentTime: TimeInterval) {
// Called before each frame is rendered
}
}
I am supposed to get the message, but the "e" goes behind the "square" and I don't get any message.

Answer 1

There is an error in your code.
Change the following:
square = SKSpriteNode(imageNamed: "square")
square.size = CGSize(width: 100, height: 100)
square.physicsBody = SKPhysicsBody(rectangleOf: square.size)
square.position = CGPoint(x: 0, y: -590)
square.physicsBody = SKPhysicsBody(rectangleOf: e.size)
square.name = "square"
to
square = SKSpriteNode(imageNamed: "square")
square.color = UIColor.red
square.size = CGSize(width: 100, height: 100)
square.physicsBody = SKPhysicsBody(rectangleOf: square.size)
square.position = CGPoint(x: 0, y: horizotaly)
//square.physicsBody = SKPhysicsBody(rectangleOf: e.size)
square.physicsBody?.affectedByGravity = false
square.name = "square"
Your problem is solved.