Moving a Sprite along a UIBezierPath - ios

Question

I have been having some trouble moving a Sprite along a UIBezierPath. I am getting this path from my view controller and it is passing along the correct path. Any ideas on why this isn't animating? Eventually I want to be able to move multiple sprites along different bezier paths.
func play(){
let img = SKSpriteNode(imageNamed:"ball.png")
img.position = CGPoint(x: self.frame.size.width/4, y: self.frame.size.height/4)
self.addChild(img)
new_path = viewController.path //UIBezierPath is being returned
let followPath = SKAction.follow(new_path.cgPath, asOffset: true, orientToPath: false, duration: 5.0)
img.run(followPath)
}
I am trying to draw a bezier path here(Kind of like a whiteboard app)in a custom view and then access the bezier path when I want to animate it. The path seems to be passed through correctly.
private var path: UIBezierPath!
let newpath = UIBezierPath()
func initBezierPath() {
path = UIBezierPath()
path.lineCapStyle = CGLineCap.round
path.lineJoinStyle = CGLineJoin.round
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch: AnyObject? = touches.first
lastPoint = touch!.location(in: self)
pointCounter = 0
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch: AnyObject? = touches.first
let newPoint = touch!.location(in: self)
path.move(to: lastPoint)
path.addLine(to: newPoint)
lastPoint = newPoint
pointCounter += 1
if pointCounter == pointLimit {
pointCounter = 0
renderToImage()
setNeedsDisplay()
newpath.append(path)
path.removeAllPoints()
}
else {
setNeedsDisplay()
}
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
pointCounter = 0
renderToImage()
setNeedsDisplay()
newpath.append(path)
path.removeAllPoints()
}