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#1 drayarms   User is offline

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How to trigger UICollectionView's reload method from another funct

Posted 16 May 2016 - 01:30 AM

I have a UICollection view which loads just fine when I launch the app. My problem is, I need to reload it with fresh data when a button from the menubar is clicked. Here's my code. To keep things simple, I've greatly trimmed it down

        class RootViewController:  UIViewController,UICollectionViewDelegateFlowLayout, UICollectionViewDataSource{//The view controller that contains the collection view
            var carouselCollectionView: UICollectionView!//A reference to the collectionview
            override func viewDidLoad() {

                let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
                layout.sectionInset = UIEdgeInsets(top: 1, left: 1, bottom: 1, right: 1)
                layout.itemSize = CGSize(width: carouselWindowWidth, height: carouselWindowHeight)
                layout.scrollDirection = UICollectionViewScrollDirection.Horizontal
                layout.minimumInteritemSpacing = 5
                layout.minimumLineSpacing = 5
                carouselCollectionView = UICollectionView(frame: self.view.frame, collectionViewLayout: layout)
                carouselCollectionView.frame = CGRectMake(0,0,200,200)
                carouselCollectionView.delegate = self
                carouselCollectionView.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: "Cell")
                carouselCollectionView.backgroundColor = UIColor.clearColor()

                self.view.addSubview(carouselCollectionView) //Add the collectionview to the main view(self)
            }//End viewDidLoad

            //Delegates for collectionViewController go here
            func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
                return currentImageArray.count

            func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
                let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath)

             func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {

             //This function is triggered when a menuItem on the menuBar is clicked.  It it supposed to fetch some data from some source, then reload the collectionview
            func reloadData(VC:UIViewController){

        }//End RootViewController

I get this error when "reloadData()" is run "fatal error: unexpectedly found nil while unwrapping an Optional value". Any ideas on how to do this correctly? Any help greatly appreciated
PS. The data as expected when I run reloadData() within viewDidLoad()

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