fatal error: unexpectedly found nil while unwrapping an Optional value at this line outDragDropCollectionView.draggingDelegate = self

Question

fatal error: unexpectedly found nil while unwrapping an Optional value at this line outDragDropCollectionView.draggingDelegate = self

Closed this issue 9 years ago · 16 comments

Dara and Drop in my project was working fine until I used this library. I have a viewcontroller that requires Drag and Drop and need sidemen animation.I am using SSASideMenu for SideMenu animation and to apply Sidemenu we need a root view controller.

To setup SSASideMenu we need this code in AppDelegate file

 //  MARK : Setup SSASideMenu

        let sideMenu = SSASideMenu(contentViewController: UINavigationController(rootViewController: FirstViewController()), leftMenuViewController: LeftMenuViewController(), rightMenuViewController: RightMenuViewController())
        sideMenu.backgroundImage = UIImage(named: "Background.jpg")
        sideMenu.configure(SSASideMenu.MenuViewEffect(fade: true, scale: true, scaleBackground: false))
        sideMenu.configure(SSASideMenu.ContentViewEffect(alpha: 1.0, scale: 0.7))
        sideMenu.configure(SSASideMenu.ContentViewShadow(enabled: true, color: UIColor.blackColor(), opacity: 0.6, radius: 6.0))
        sideMenu.delegate = self

        window?.rootViewController = sideMenu
        window?.makeKeyAndVisible()

When I set the rootViewController as HomeViewController in the AppDelegate the error Occurs what to do next make everything work as normal ???

NuelNikhil commented 9 years ago

Yes.

Answer 1 · 2016-04-11T12:22:28.000Z

Where is it crashing exactly? Try add an exception breakpoint. I'm not even entirely sure it's related to dragDropCollectionView

Answer 2 · 2016-04-11T12:25:31.000Z

At this line outDragDropCollectionView.draggingDelegate = self

Answer 3 · 2016-04-11T12:27:01.000Z

Can you show me the code that you have inside that function? Did you initialize outDragDropCollectionView?

Answer 4 · 2016-04-11T12:28:14.000Z

I only have this code inside viewdidload

outDragDropCollectionView.draggingDelegate = self
        outDragDropCollectionView.enableDragging(true)

Answer 5 · 2016-04-11T12:31:21.000Z

Are you using storyboards?

Answer 6 · 2016-04-11T12:34:45.000Z

I get the feeling you havent initialized your collection view properly. To test, try add print(outDragDropCollectionView) before you set the draggingDelegate, does it crash there?

Answer 7 · 2016-04-11T12:35:40.000Z

Let me try

Answer 8 · 2016-04-11T12:42:24.000Z

Getting this error fatal error: unexpectedly found nil while unwrapping an Optional value

Answer 9 · 2016-04-11T12:49:45.000Z

Yes then that means you havent initialized your collectionView properly. Are you sure you have set up storyboards correctly?

Answer 10 · 2016-04-11T12:51:52.000Z

I think So... It was working until I have added Homeviewcontroller as the root controller in app delegate file.

Answer 11 · 2016-04-12T05:40:20.000Z

I just followed the library and is this enough @IBOutlet weak var outDragDropCollectionView: DragDropCollectionView! ??? or need any other initialisation ?

Answer 12 · 2016-04-12T07:49:59.000Z

In your storyboard, did you remember to make your UICollectionView a subclass of DragDropCollectionView?

Answer 13 · 2016-04-12T08:22:49.000Z

Yes...
@IBOutlet weak var outDragDropCollectionView: DragDropCollectionView!

Answer 14 · 2016-04-12T09:05:18.000Z

Mmm difficult for me to diagnose without looking at your project. Anyways this issue is unrelated to DragDropCollectionView, hence closing

Answer 15 · 2016-04-12T09:19:07.000Z

Okay... So let me try the same with SSASideMenu ... :)