UIScrollViewDelegate functions not called - ios

Question

My view seems to scroll when I drag it (the side bars appear and move around), but my delegate functions do not trigger. QUESTION: Why don't the println's in the protocol function ever get called? By way of background, I am trying to re-write https://github.com/bobmoff/ScrollKit in Swift which is why UIView is mixed with SKView, etc.
My log output is:
852.0480.0Finished viewDidLoad
The code is:
import UIKit
import SpriteKit
var kViewTransformChanged = "view transform changed"
var scene = GameScene()
var skView = SKView()
var clearContentView = UIView()
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 GameScene
archiver.finishDecoding()
return scene
} else {
return nil
}
}
}
class GameViewController: UIViewController, UIScrollViewDelegate {
override func viewDidLoad() {
super.viewDidLoad()
// Configure the view.
skView = self.view as SKView
skView.showsFPS = true
skView.showsNodeCount = true
/* Sprite Kit applies additional optimizations to improve rendering performance */
skView.ignoresSiblingOrder = true
/* Set the scale mode to scale to fit the window */
scene.scaleMode = .AspectFill
skView.presentScene(scene)
var contentSize = skView.bounds.size
contentSize.height *= 1.5
contentSize.width *= 1.5
scene.size = contentSize
println(contentSize.height)
println(contentSize.width)
var scrollView = UIScrollView()
scrollView.frame = skView.frame
scrollView.contentSize = contentSize
scrollView.delegate = self
scrollView.maximumZoomScale = 3
scrollView.minimumZoomScale = 1
scrollView.indicatorStyle = UIScrollViewIndicatorStyle.White
clearContentView.frame = CGRect(origin: CGPointZero, size: contentSize)
clearContentView.backgroundColor = UIColor.clearColor()
scrollView.addSubview(clearContentView)
clearContentView.addObserver(self, forKeyPath: "transform", options: NSKeyValueObservingOptions(), context: &kViewTransformChanged)
skView.addSubview(scrollView)
//
println("Finished viewDidLoad")
}
func viewForZoomingInScrollView() -> UIView? {
println("entering viewForZoomingInScrollView function")
return self.view
}
func scrollViewDidScroll() {
println("entering scrollViewDidScroll function")
adjustContent()
}
// NOT SURE ABOUT THIS FUNCTION
func adjustContent() {
println("entering adjustContent function")
NSLog("?")
var scrollV = self.view as UIScrollView
scene.setScale(scrollV.zoomScale)
scene.position = scrollV.contentOffset
}
func scrollViewDidZoom() {
println("entering scrollViewDidZoom function")
adjustContent()
}
func scrollViewDidTransform() {
println("entering scrollViewDidTransform function")
adjustContent()
}
func scrollViewDidEndZooming() {
println("entering scrollViewDidEndZooming function")
adjustContent()
}
override func shouldAutorotate() -> Bool {
return true
}
override func supportedInterfaceOrientations() -> Int {
if UIDevice.currentDevice().userInterfaceIdiom == .Phone {
return Int(UIInterfaceOrientationMask.AllButUpsideDown.rawValue)
} else {
return Int(UIInterfaceOrientationMask.All.rawValue)
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Release any cached data, images, etc that aren't in use.
}
override func prefersStatusBarHidden() -> Bool {
return true
}
}

Answer 1

Your UIScrollViewDelegate function implementations do not match the declarations in the documentation. Specifically, you're missing the UIScrollView parameter.
For example, this:
func scrollViewDidScroll() {
println("entering scrollViewDidScroll function")
adjustContent()
}
should be:
func scrollViewDidScroll(scrollView: UIScrollView) {
println("entering scrollViewDidScroll function")
adjustContent()
}