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How to create Xcode SWIFT overlay to display HUD or controls?

I have a scene created with SceneKit. This is a game that uses SceneKit. I am trying to make a HUD so I can set the controls on the screen using SpriteKit. The problem is that I have no code at all and I don't know what I am missing. Can you rewrite it correctly? I tried to add an on-screen sprite image called base, but I'm not sure if you add a child after you have overlay SpriteKit overlaySKScene?

code:

  import iAd
  import UIKit
  import GameKit
  import SceneKit
  import StoreKit
  import SpriteKit
  import QuartzCore
  import Foundation
  import AVFoundation
  import AudioToolbox

  //============================================================
  class GameViewController: UIViewController, ADBannerViewDelegate, SKPhysicsContactDelegate, SKSceneDelegate, SCNSceneRendererDelegate, SCNPhysicsContactDelegate{

  let base = SKSpriteNode(imageNamed:"VirtualJoystickBase")


   override func viewDidLoad() {
    super.viewDidLoad()


    let scnView = self.view as! SCNView
    let skScene = scnView.overlaySKScene
    scnView.overlaySKScene = skScene
    scnView.backgroundColor = UIColor.whiteColor()
    scnView.scene = FieldScene
    scnView.delegate = self
    scnView.allowsCameraControl = true
    scnView.showsStatistics = false

     base.size = CGSize(width: 100, height: 100)
    base.anchorPoint = CGPointMake(-3.4, -5.2)
    scnView.overlaySKScene?.addChild(base)
+3
ios swift sprite-kit scenekit


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1 answer


The main problem is with the following lines of code:

let skScene = scnView.overlaySKScene
scnView.overlaySKScene = skScene

These two lines are a place of completely useless action. By default it overlaySKScene

returns nil

for its own scnView

, because it doesn't have SKScene. And you store this object nil

before skScene

and then return it to scnView.overlaySKScene

(even if it wasn't, it nil

's absolutely useless to do that)

Then when you try to do this:

scnView.overlaySKScene?.addChild(base)

addChild

did not cause due scnView.overlaySKScene

nil

. This is why you have nothing at the end.

To fix this, you need to create an object skScene

, for example like this:



let overlayScene = SKScene(size: CGSizeMake(100, 100))

Then you can set position

for your object base

like this:

base.position = CGPointMake(50, 0)

Then add the object base

to the scene:

overlayScene.addChild(base)

Finally, set the scene like this:

scnView.overlaySKScene = overlayScene
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