What am i doing wrong when I switch scenes? - swift

Question

I am developing a game on sprite kit, and when the player loses they are taken to the EndScene and giving the option to play again. The problem I am having is when the player presses the button to play again they are taken to the GameScene, but instead the GameScene its appearing all blue. Can anyone tell me what I am doing wrong? I posted the EndScene below, if you need me to post the GameScene class just ask.
class EndScene: SKScene {
var RestartBtn : UIButton!
override func didMoveToView(view: SKView) {
scene?.backgroundColor = UIColor.whiteColor()
RestartBtn = UIButton(frame: CGRect(x: 0, y: 0, width: view.frame.size.width, height: 30))
RestartBtn.setTitle("Restart", forState: UIControlState.Normal)
RestartBtn.setTitleColor(UIColor.darkGrayColor(), forState: UIControlState.Normal)
RestartBtn.addTarget(self, action: Selector("Restart"), forControlEvents: UIControlEvents.TouchUpInside)
self.view?.addSubview(RestartBtn)
}
func Restart() {
// close EndScene and start the game again
self.view?.presentScene(GameScene())
RestartBtn.removeFromSuperview()
}
}
GameScene
import SpriteKit
struct PhysicsCatagory {
static let Enemy : UInt32 = 1 //000000000000000000000000000001
static let Bullet : UInt32 = 2 //00000000000000000000000000010
static let Player : UInt32 = 3 //00000000000000000000000000100
}
class GameScene: SKScene, SKPhysicsContactDelegate {
var Score = Int()
var Player = SKSpriteNode(imageNamed: "PlayerGalaga.png")
var ScoreLbl = UILabel()
override func didMoveToView(view: SKView) {
/* Setup your scene here */
physicsWorld.contactDelegate = self
self.scene?.backgroundColor = UIColor.blackColor()
Player.position = CGPointMake(self.size.width / 2, self.size.height / 5)
Player.physicsBody = SKPhysicsBody(rectangleOfSize: Player.size)
Player.physicsBody?.affectedByGravity = false
Player.physicsBody?.categoryBitMask = PhysicsCatagory.Player
Player.physicsBody?.contactTestBitMask = PhysicsCatagory.Enemy
Player.physicsBody?.dynamic = false
var Timer = NSTimer.scheduledTimerWithTimeInterval(0.2, target: self,
selector: Selector("SpawnBullets"), userInfo: nil, repeats: true)
var EmenyTimer = NSTimer.scheduledTimerWithTimeInterval(1.0, target:
self, selector: ("SpawnEnemies"), userInfo: nil, repeats: true)
self.addChild(Player)
ScoreLbl.text = "\(Score)"
ScoreLbl = UILabel(frame: CGRect(x: 0,y: 0, width: 100, height: 20))
ScoreLbl.backgroundColor = UIColor(red: 0.1, green: 0.1, blue: 0.1,
alpha:0.3 )
ScoreLbl.textColor = UIColor.whiteColor()
self.view?.addSubview(ScoreLbl)
}
func didBeginContact(contact: SKPhysicsContact) {
var firstBody : SKPhysicsBody = contact.bodyA
var secondBody : SKPhysicsBody = contact.bodyB
if ((firstBody.categoryBitMask == PhysicsCatagory.Enemy) &&
(secondBody.categoryBitMask == PhysicsCatagory.Bullet) ||
(firstBody.categoryBitMask == PhysicsCatagory.Bullet) &&
(secondBody.categoryBitMask == PhysicsCatagory.Enemy)){
CollisionWithBullet(firstBody.node as! SKSpriteNode, Bullet:
secondBody.node as! SKSpriteNode)
}
else if ((firstBody.categoryBitMask == PhysicsCatagory.Enemy) &&
(secondBody.categoryBitMask == PhysicsCatagory.Player) ||
(firstBody.categoryBitMask == PhysicsCatagory.Player) &&
(secondBody.categoryBitMask == PhysicsCatagory.Enemy)){
CollisionWithPerson(firstBody.node as! SKSpriteNode, Person:
secondBody.node as! SKSpriteNode)
}
}
func CollisionWithBullet(Enemy: SKSpriteNode, Bullet:SKSpriteNode){
Enemy.removeFromParent()
Bullet.removeFromParent()
Score++
ScoreLbl.text = "\(Score)"
}
func CollisionWithPerson(Enemy:SKSpriteNode, Person:SKSpriteNode){
Enemy.removeFromParent()
Player.removeFromParent()
self.view?.presentScene(EndScene())
ScoreLbl.removeFromSuperview()
}
func SpawnBullets(){
var Bullet = SKSpriteNode(imageNamed: "BulletGalaga.png")
Bullet.zPosition = -5
Bullet.position = CGPointMake(Player.position.x, Player.position.y)
let action = SKAction.moveToY(self.size.height + 30, duration: 0.5)
let actionDone = SKAction.removeFromParent()
Bullet.runAction(SKAction.sequence([action, actionDone]))
Bullet.physicsBody = SKPhysicsBody(rectangleOfSize: Bullet.size)
Bullet.physicsBody?.categoryBitMask = PhysicsCatagory.Bullet
Bullet.physicsBody?.contactTestBitMask = PhysicsCatagory.Enemy
Bullet.physicsBody?.affectedByGravity = false
Bullet.physicsBody?.dynamic = false
self.addChild(Bullet)
}
func SpawnEnemies(){
var Enemy = SKSpriteNode(imageNamed: "EnemyGalaga.png")
var MinValue = self.size.width / 8
var MaxValue = self.size.width - 20
var SpawnPoint = UInt32(MaxValue - MinValue)
Enemy.position = CGPointMake(CGFloat(arc4random_uniform(SpawnPoint)),
self.size.height)
Enemy.physicsBody = SKPhysicsBody(rectangleOfSize: Enemy.size)
Enemy.physicsBody?.categoryBitMask = PhysicsCatagory.Enemy
Enemy.physicsBody?.contactTestBitMask = PhysicsCatagory.Bullet
Enemy.physicsBody?.affectedByGravity = false
Enemy.physicsBody?.dynamic = true
let action = SKAction.moveToY(-70, duration: 2.0)
let actionDone = SKAction.removeFromParent()
Enemy.runAction(SKAction.sequence([action, actionDone]))
self.addChild(Enemy)
}
override func touchesBegan(touches: Set<NSObject>, withEvent event:
UIEvent) {
/* Called when a touch begins */
for touch: AnyObject in touches {
let location = touch.locationInNode(self)
Player.position.x = location.x
}
}
override func touchesMoved(touches: Set<NSObject>, withEvent event:
UIEvent) {
for touch: AnyObject in touches {
let location = touch.locationInNode(self)
Player.position.x = location.x
}
}
override func update(currentTime: CFTimeInterval) {
/* Called before each frame is rendered */
}
}

Answer 1

From what I can see, when there's a collision with person, you're removing nodes from the view, so they're still going to be gone when you recall GameScene from the restart() function in the EndScene.
What you can do is create a func initialScene() in GameScene where you create everything in that function and call it in the didMoveToView function (instead of doing it all in the didMoveToView function). That way, whenever you present the GameScene from another class, it will call that function and recreate everything you need as if you actually restarted. Hope that's a helpful start, if you need anything else just comment.