How to Link a .Sks File to a .Swift File in Spritekit

Linking the SKS file to a Custom Class in SpriteKit

As you suggested, the SKS file is probably not linked to the swift file.

In Xcode

• open the sks file
• select your scene
• open the right side panel
• open the Custom Class Inspector
• type MenuScene into the Custom Class field

Then try again.

How do I link a .sks file to a .swift file in SpriteKit

This method will unarchive an sks file and initialise it as whichever SKNode subclass it is called on. This means you can unarchive a file as an SKNode (so the root node will be an SKNode) and add it as a child to your scene. You can also unarchive a file as GameScene or any SKNode subclass.

extension SKNode {
    class func unarchiveFromFile(file : NSString) -> SKNode? {
        if let path = NSBundle.mainBundle().pathForResource(file, ofType: "sks") {
            var sceneData = NSData(contentsOfFile: path, options: .DataReadingMappedIfSafe, error: nil)!
            var archiver = NSKeyedUnarchiver(forReadingWithData: sceneData)

            archiver.setClass(self.classForKeyedUnarchiver(), forClassName: "SKScene")
            let scene = archiver.decodeObjectForKey(NSKeyedArchiveRootObjectKey) as SKNode
            archiver.finishDecoding()
            return scene
        } else {
            return nil
        }
    }
}

Use it like this:

let scene = GameScene.unarchiveFromFile("GameScene")! as GameScene

or

let levelStuff = SKNode.unarchiveFromFile("Level 1")!
self.addChild(levelStuff)

How can you connect a swift file with an SKscene?

You can do it like this:

1) Create .swift file and make a subclass of a SKScene

Go to :

File menu -> New File -> Source -> Swift file

and make subclass of a SKScene

class MenuScene:SKScene {}

2) Create .sks file

Then go to

File menu -> New File -> Resource -> SpriteKit Scene

and make a MenuScene.sks (name it MenuScene without the actual extension).

Repeat this steps for each scene you want to have.

Then to load and start your initial scene. Do this inside your GameViewController.swift:

if let scene = GameScene(fileNamed:"GameScene") {
      let skView = self.view as! SKView
      //setup your scene here
      skView.presentScene(scene)
}

To make a transition to other scene (lets assume that you are in the MenuScene currently) you should do something like this:

if let nextScene = GameScene(fileNamed: "GameScene"){
  nextScene.scaleMode = self.scaleMode                 
  let transition = SKTransition.fadeWithDuration(1)                  
  view?.presentScene(nextScene, transition: transition)
}

How can I reference a GameScene.swift file as a base for the rest of my game levels?

Yes, you can subclass your original Gamescene and inherit all of its functionality from the other game scenes you are creating.

So you would create an original game scene that inherits from SKScene, like this:

class OriginalGameScene: SKScene {

    // all of your shared logic here (didMoveTo and didBegin) functions

}

And for all the game scenes in your project, just inherit from that original game scene like this:

class FirstGameScene: OriginalGameScene {

    // this class has the logic from the functions didMoveTo and didBegin 

}

Only put the logic that you want shared throughout every other game scene in your OriginalGameScene and you will be able to access any functions or logic that you implement in that OriginalGameScene file.

Connecting multiple .sks files to multiple .swift files in SpriteKit

To connect .sks files to .swift files, you simply give them the same name. What I was missing was that I needed to create a "Cocoa Touch Class" instead of a new "Swift File." If the class and the .sks file have the same name, they are automatically connected.

Creating new swift scene with corresponding sks file

This can be done via initializing a new action.. check SKAction documentation (or autocomplete in xcode) to see it's initializers.

Here is a snippet based on Apple's website that will do what you need:

// init?(named: String)
// Creates an action of the given name from an action file.
let action = SKAction(named: "whateverYourActionnameIS")

Scroll all the way to the bottom to see the list of functions, inits, etc, for SKAction:
https://developer.apple.com/reference/spritekit/skaction

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