How to have a collision reset an image to a different location and update score - swift

Question

I would like to know what im doing wrong with my collision detection. I'm trying to make a game where the user controls a character using a virtual joystick and tries to catch donuts that fall from the top of the screen. The joystick works and having the donut fall works but when the two object collide the score isn't updated and the donut location isn't reset to its default location like I want it to. I have looked at several tutorials but can't seem to find my mistake.
import SpriteKit
import GameplayKit
struct BodyType {
static let Character: UInt32 = 1
static let Knife: UInt32 = 2
static let Donut: UInt32 = 4
}
class GameScene: SKScene, SKPhysicsContactDelegate {
var score: Int = 0
var level: Int = 0
var scoreLabel: SKLabelNode = SKLabelNode(text: "Score: 0")
var BoostButton: SKSpriteNode = SKSpriteNode(imageNamed: "boost")
var Knife: SKSpriteNode = SKSpriteNode(imageNamed: "knife")
var Donut: SKSpriteNode = SKSpriteNode(imageNamed: "donut")
var velocityMultiplier: CGFloat = 0.15
var BoostActive: Bool = false
var KnifeVel: CGFloat = 3
var KnifeX: CGFloat = 0
var KnifeY: CGFloat = 0
var FoodX: CGFloat = 0
var FoodY: CGFloat = 0
var FoodVel: CGFloat = 3
enum NodesZPosition: CGFloat {
case Character, joystick
}
var Character: SKSpriteNode = SKSpriteNode(imageNamed: "character")
var analogJoystick: AnalogJoystick = {
let js = AnalogJoystick(diameter: 90, images: (UIImage(named: "substrate"), UIImage(named: "stick")))
js.position = CGPoint(x: 480, y: 75)
js.zPosition = NodesZPosition.joystick.rawValue
return js
}()
override func didMove(to view: SKView) {
self.physicsWorld.contactDelegate = self
backgroundColor = UIColor.blue
self.anchorPoint = CGPoint(x: 0, y: 0)
Character.position = CGPoint(x: 100,y: 200)
Character.size = Donut.size
Character.physicsBody = SKPhysicsBody(texture: Character.texture!, size: Character.size)
Character.physicsBody?.affectedByGravity = false
Character.name = "Character"
Character.physicsBody?.isDynamic = true
Character.physicsBody?.categoryBitMask = BodyType.Character
Character.physicsBody?.collisionBitMask = BodyType.Knife | BodyType.Donut
Character.physicsBody?.contactTestBitMask = BodyType.Knife | BodyType.Donut
self.addChild(Character)
self.addChild(BoostButton)
BoostButton.position = CGPoint(x: 75, y: 75)
Knife.position = CGPoint(x: self.frame.width + 100, y: 200)
Knife.name = "Knife"
self.addChild(Knife)
Donut.position = CGPoint(x: 200, y: self.frame.height + 150)
Donut.name = "Donut"
self.addChild(Donut)
scoreLabel.position = CGPoint(x: 65, y: self.frame.height - 40)
scoreLabel.fontSize = 30
scoreLabel.fontColor = UIColor.black
self.addChild(scoreLabel)
setupJoystick()
let border = SKPhysicsBody(edgeLoopFrom: self.frame)
border.friction = 0
self.physicsBody = border
}
func setupJoystick (){
addChild(analogJoystick)
analogJoystick.trackingHandler = {[unowned self] data in
self.Character.position = CGPoint(x: self.Character.position.x + (data.velocity.x * self.velocityMultiplier),y: self.Character.position.y + (data.velocity.y * self.velocityMultiplier))
self.Character.zRotation = data.angular
}
}
private func didBegin(_ contact: SKPhysicsContact) {
var firstBody = SKPhysicsBody()
var secondBody = SKPhysicsBody()
if contact.bodyA.node?.name == "Character" {
firstBody = contact.bodyA
secondBody = contact.bodyB
}
else{
firstBody = contact.bodyB
secondBody = contact.bodyA
}
if firstBody.node?.name == "Character" && secondBody.node?.name == "Donut"{
print("collison")
score += 20
scoreLabel.text = "Score \(score)"
Donut.position.y = self.frame.height + 150
Donut.position.x = CGFloat.random(in: 100..<(self.frame.width - 100))
}
else if firstBody.node?.name == "Donut" && secondBody.node?.name == "Character"{
print("collison")
score += 20
scoreLabel.text = "Score \(score)"
Donut.position.y = self.frame.height + 150
Donut.position.x = CGFloat.random(in: 100..<(self.frame.width - 100))
}
}
func touchDown(atPoint pos : CGPoint) {
}
func touchMoved(toPoint pos : CGPoint) {
}
func touchUp(atPoint pos : CGPoint) {
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in (touches ){
let location = touch.location(in: self)
if (BoostButton.frame.contains(location)){
BoostActive = true
}
else{
BoostActive = false
}
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
}
override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
}
override func update(_ currentTime: TimeInterval) {
// if (BoostActive == true){
// velocityMultiplier = velocityMultiplier * 1.5
// }
// else{
// velocityMultiplier = 0.15
//}
FoodY = Donut.position.y
KnifeX = Knife.position.x
if (Knife.position.x < (self.frame.width - 20) && Knife.position.x > 20){
Knife.physicsBody = SKPhysicsBody(texture: Knife.texture!, size: Knife.size)
Knife.physicsBody?.affectedByGravity = false
Knife.physicsBody?.restitution = 0
Knife.physicsBody?.pinned = false
Knife.physicsBody?.isDynamic = true
Knife.physicsBody?.allowsRotation = false
Knife.physicsBody?.categoryBitMask = BodyType.Knife
Knife.physicsBody?.collisionBitMask = BodyType.Character
Knife.physicsBody?.contactTestBitMask = BodyType.Character
}
else{
Knife.physicsBody = nil
}
if (Donut.position.y < self.frame.height && Donut.position.y > 50){
Donut.physicsBody = SKPhysicsBody(texture: Donut.texture!, size: Donut.size)
Donut.physicsBody?.affectedByGravity = false
Donut.physicsBody?.isDynamic = false
Donut.physicsBody?.categoryBitMask = BodyType.Donut
Donut.physicsBody?.collisionBitMask = BodyType.Character
Donut.physicsBody?.contactTestBitMask = BodyType.Character
}
else{
Donut.physicsBody = nil
}
if (FoodY < 30){
Donut.position.y = self.frame.height + 150
Donut.position.x = CGFloat.random(in: 100..<(self.frame.width - 100))
}
else{
Donut.position.y = Donut.position.y - FoodVel
}
if (KnifeX < 0){
Knife.position.x = self.frame.width + 150
Knife.position.y = CGFloat.random(in: 50..<(self.frame.height - 50))
}
else{
Knife.position.x = Knife.position.x - KnifeVel
}
}
}