UICollectionViewDelegateFlowLayout methods not called in Swift 2.3 App

Question

None of my UICollectionViewDelegateFlowLayout methods are called. Can somebody help me find a solution?

In my ViewDidLoad method, I have set delegate and datasource for collection view as self.collectionView.delegate = self and self.collectionView.dataSource = self

Here is my delegate methods:

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
    let deviceIdiom = UIScreen.mainScreen().traitCollection.userInterfaceIdiom
    switch(deviceIdiom){
    case .Phone:

        return UIEdgeInsets(top: 50, left: 10, bottom: 0, right: 10)
    case .Pad:
        return UIEdgeInsets(top: 60, left: 20, bottom: 0, right: 20)
    default:
        break
    }
}

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
    return CGFloat(8)
}

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {

    let deviceIdiom =          UIScreen.mainScreen().traitCollection.userInterfaceIdiom

    switch(deviceIdiom){
    case .Phone:

        let cellWidth = (view.bounds.size.width - 16) / 2
        let cellHeight = cellWidth
     return CGSize(width: cellWidth, height: cellHeight)

    case .Pad:

        let cellWidth = (view.bounds.size.width - 40) / 2
        let cellHeight = cellWidth
        return CGSize(width: cellWidth, height: cellHeight)

    default:
        break
    }
}

My ViewDidLoad method-

override func viewDidLoad() { super.viewDidLoad()

 self.collectionView.dataSource = self
 self.collectionView.delegate = self
    cellImages = [
        "contact.png",
        "share.png",
        "setting.png",
        "logout.png"]
    cellLabels = [
        "Contact",
        "Share",
       "Setting",
        "Logout"]

    self.view.backgroundColor = uicolorFromHex(0xE5DADA)

    self.collectionView?.backgroundColor = uicolorFromHex(0xE5DADA)
    self.navigationController?.navigationBarHidden = false
    self.navigationItem.hidesBackButton = true
    navigationController!.navigationBar.titleTextAttributes =
        [NSForegroundColorAttributeName: UIColor.whiteColor()]
    navigationController!.navigationBar.barTintColor = UIColor(red: 0.0431, green: 0.0824, blue: 0.4392, alpha: 1.0)

    if let user = User.currentUser(){
    if(user.manager){
    self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Board", style: UIBarButtonItemStyle.Plain, target: self, action: #selector(goToBoard))

}

Thanks,

Answer 1

I finally solved this by creating extension of my class MainViewController : UICollectionViewDelegateFlowLayout { } , putting all delegate method in there and cleaning build. It works property in Swift 3 (in the same class) but for swift 2.3 for some strange reason it needs to be put in extension. Thanks,