Scene transition in spritekit not transitioning - ios

Question

I am in sprite kit making a game in swift. (I am new to swift) And I would like to transition a scene when a node is pressed. I looked it up and the proper way to transition is
let transition = SKTransition.revealWithDirection(SKTransitionDirection.Down, duration: 1.0)
let scene = GameScene(size: self.scene.size)
scene.scaleMode = SKSceneScaleMode.AspectFill
self.scene.view.presentScene(scene, transition: transition)
But when I am programming it doesn't like the self.scene.size and puts a question mark on scene. Here is my code
let playView = PlayScene(size: self.scene?.size)
And I don't know how to fix this. Any suggestions? (Or it might be just a simple error in my part because I am new to swift.
Here is more of my code
In the GameScene.swift File
class GameScene: SKScene {
var playButton = SKSpriteNode(imageNamed: "Play")
var levelsButton = SKSpriteNode(imageNamed: "Levels")
var optionsButton = SKSpriteNode(imageNamed: "Options")
override func didMoveToView(view: SKView) {
/* Setup your scene here */
let myLabel = SKLabelNode(fontNamed:"Helvetica-Light")
myLabel.text = "Mini Golf";
myLabel.fontSize = 30;
myLabel.position = CGPoint(x:CGRectGetMidX(self.frame), y:525);
println(size.height)
println(size.width)
let backgroundNode = SKSpriteNode(imageNamed: "Background")
backgroundNode.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame));
playButton.position = CGPoint(x: CGRectGetMidX(self.frame), y: 360)
levelsButton.position = CGPoint(x: CGRectGetMidX(self.frame), y: 295)
optionsButton.position = CGPoint(x: CGRectGetMidX(self.frame), y: 230)
self.addChild(backgroundNode)
self.addChild(playButton)
self.addChild(levelsButton)
self.addChild(optionsButton)
self.addChild(myLabel)
}
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
/* Called when a touch begins */
super.touchesBegan(touches, withEvent: event)
for touch: AnyObject in touches {
let location = touch.locationInNode(self)
//let touchedNode = nodeAtPoint(Location)
//touchedNode.postiion =location
let transitionToPlayScene = SKTransition.revealWithDirection(SKTransitionDirection.Down, duration: 1.0)
if CGRectContainsPoint(playButton.frame, location) {
let playView = PlayScene(size: self.scene?.size)
}
}
}
This is the code in the PlayScene.swift file
import Foundation
import UIKit
import SpriteKit
private let WALL_CATEGORY: UInt32 = 0x1 << 0
private let HOLE_CATEGORY: UInt32 = 0x1 << 1
private let GOLF_CLUB_CATEGORY: UInt32 = 0x1 << 2
private let BALL_CATEGORY: UInt32 = 0x1 << 4
private let DECORATION_BORDER_CATEGORY: UInt32 = 0x1 << 5
class PlayScene: SKScene, SKPhysicsContactDelegate {
var ballNode = SKSpriteNode(imageNamed: "Ball")
var flag = SKSpriteNode(imageNamed: "Flag")
var club = SKSpriteNode(imageNamed: "Golf Club")
var tee = SKSpriteNode(imageNamed: "Tee")
var hole = SKSpriteNode(imageNamed: "Hole")
var decoBorder1 = SKSpriteNode(imageNamed: "Border 1")
var decoBorder2 = SKSpriteNode(imageNamed: "Border 2")
override func didMoveToView(view: SKView) {
//Setting up the view's physics
let borderBody = SKPhysicsBody(edgeLoopFromRect: self.frame);
self.physicsBody = borderBody
self.physicsBody?.friction = 0.0
self.physicsBody?.categoryBitMask = WALL_CATEGORY
self.physicsWorld.gravity = CGVectorMake(0.0 ,0.0);
self.physicsWorld.contactDelegate = self
//Setting the ball's properties
ballNode.position = CGPoint(x: CGRectGetMidX(self.frame), y: 100);
ballNode.physicsBody = SKPhysicsBody(rectangleOfSize: ballNode.frame.size);
ballNode.physicsBody?.categoryBitMask = BALL_CATEGORY
ballNode.physicsBody?.mass = 50.0
ballNode.physicsBody?.dynamic = true
ballNode.physicsBody?.allowsRotation = true
self.addChild(ballNode)
//Setting the club's properties
club.position = CGPoint(x: CGRectGetMidX(self.frame)-20, y: 75);
club.physicsBody = SKPhysicsBody(rectangleOfSize: self.frame.size);
club.physicsBody?.categoryBitMask = GOLF_CLUB_CATEGORY
club.physicsBody?.mass = 150.0
club.physicsBody?.dynamic = true
club.physicsBody?.allowsRotation = false
self.addChild(club)
//Setting the Tee's properties
tee.position = CGPoint(x: CGRectGetMidX(self.frame), y: 70);
//self.addChild(tee)
//Setting the decoration border nodes
decoBorder1.position = CGPoint(x: CGRectGetMinX(self.frame), y: 500);
decoBorder2.position = CGPoint(x: CGRectGetMaxX(self.frame), y:500);
decoBorder1.physicsBody = SKPhysicsBody(rectangleOfSize: self.frame.size);
decoBorder2.physicsBody = SKPhysicsBody(rectangleOfSize: self.frame.size);
decoBorder1.physicsBody?.categoryBitMask = DECORATION_BORDER_CATEGORY
decoBorder1.physicsBody?.dynamic = false;
decoBorder1.physicsBody?.allowsRotation = false
decoBorder2.physicsBody?.categoryBitMask = DECORATION_BORDER_CATEGORY
decoBorder2.physicsBody?.dynamic = false;
decoBorder2.physicsBody?.allowsRotation = false
//self.addChild(decoBorder1)
//self.addChild(decoBorder2))
//Setting the Hole properties
hole.position = CGPoint(x: CGRectGetMidX(self.frame), y: 550);
hole.physicsBody = SKPhysicsBody(rectangleOfSize: self.frame.size);
hole.physicsBody?.categoryBitMask = HOLE_CATEGORY
hole.physicsBody?.dynamic = false
hole.physicsBody?.allowsRotation = false
//self.addChild(hole)
}

Answer 1

The question mark comes from optional chaining because your scene property must have been declared like this SKScene?. This isn't a problem though, it just means that if your scene is nil, it won't get the size property.
The real problem is probably this line:
self.scene.view.presentScene(scene, transition: transition)
Reason being, your scene probably doesn't have a view before it's presented.
You probably wanted something like this:
(self.view as SKView).presentScene(scene, transition: transition)
You'll notice I said probably a lot. I'm only speculating on the problem because I don't see enough code, but I appreciate the effort to try and narrow down your problem. You should post more though because it may be somewhere else.
Edit
Try replacing this:
let transitionToPlayScene = SKTransition.revealWithDirection(SKTransitionDirection.Down, duration: 1.0)
if CGRectContainsPoint(playButton.frame, location) {
let playView = PlayScene(size: self.scene?.size)
}
With this
if CGRectContainsPoint(playButton.frame, location) {
let transitionToPlayScene = SKTransition.revealWithDirection(SKTransitionDirection.Down, duration: 1.0)
let nextScene = PlayScene(size: self.size)
self.view!.presentScene(nextScene, transition: transitionToPlayScene)
}

Answer 2

What ended up working for me was this:
let transition = SKTransition.revealWithDirection(SKTransitionDirection.Down, duration: 1.0)
let scene = GameScene(size: (self.scene as SKScene!).size)
scene.scaleMode = SKSceneScaleMode.AspectFill
(self.view as SKView!).presentScene(scene, transition: transition)