Swift 2 SkScene Changing - ios

Question

I am new to both coding (swift) and making games. I am trying to get my game to switch SKScenes which I have created, for some reason when I try and switch scenes I just get a grey screen and I have no idea why. (It should be noted that the scene I am trying to transition from was already changed from the previous main scene. Below is the method I am using to change scenes. (I do not want any tranistion between the SKScenes)
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
for touch in touches {
let location = touch.locationInNode(self)
if(self.nodeAtPoint(location).name != nil && self.nodeAtPoint(location).name != "enter") {
userSequence.append(Int(self.nodeAtPoint(location).name!)!)
print("userSequence:\(userSequence)")
}
if(self.nodeAtPoint(location).name == "enter"){
//compareSequences()
if PreviewNumbersGameScene.sharedInstance.TempGeneratedSequence == userSequence.reverse(){
print(PreviewNumbersGameScene.sharedInstance.TempGeneratedSequence)
print("good")
let Winscene = WinGameScene(fileNamed: "WinGameScene")
self.scene!.view?.presentScene(Winscene)
}
else{
print("Temp:\(PreviewNumbersGameScene.sharedInstance.TempGeneratedSequence)")
loose()
print("bad")
}
}
}
}
And this is the scene I want to change to: (Name is WinGameScene)
import SpriteKit
class WinGameScene: SKScene{
//MARK: - Variables
//MARK: - View
override func didMoveToView(view: SKView) {
///* Setup your scene here */
loadView()
}
func loadView(){
backgroundColor = SKColor.greenColor()
print("winSceneLoaded")
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
for touch in touches {
let scene = PreviewNumbersGameScene(fileNamed: "PreviewNumbersGameScene")
self.view?.presentScene(scene)
}
}
}

Answer 1

In order to transition to a new scene, you should do something like this:
if let winGameScene = WinGameScene(fileNamed: "WinGameScene") {
self.view?.presentScene(winGameScene)
}else{
print("error")
}
The important thing here is that before you try to do this, you have to create a resource file called WinGameScene.sks. You can do that by going to: File->New->File...->Resource->SpriteKit Scene.