Swift - could not dequeue a view of kind: UICollectionElementKindCell

Question

I got this error message when trying to load my project

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'could not dequeue a view of kind: UICollectionElementKindCell with identifier CustomCell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard'

My code is:

extension ViewController: JTAppleCalendarViewDelegate, JTAppleCalendarViewDataSource {
    func configureCalendar(_ calendar: JTAppleCalendarView) -> ConfigurationParameters {
        formatter.dateFormat = "yyyy MM dd"
        formatter.timeZone = Calendar.current.timeZone
        formatter.locale = Calendar.current.locale

        let startDate = formatter.date(from: "2017 01 01")!
        let endDate = formatter.date(from: "2017 12 31")!

        let parameters = ConfigurationParameters(startDate: startDate, endDate: endDate)
        return parameters
    }

    func calendar(_ calendar: JTAppleCalendarView, cellForItemAt date: Date, cellState: CellState, indexPath: IndexPath) -> JTAppleCell {
        let cell = calendar.dequeueReusableJTAppleCell(withReuseIdentifier: "CustomCell", for: indexPath) as! CustomCell
        cell.dateLabel.text = cellState.text
        return cell
    }
}

Please help me debug this problem. Thank you.

Edit: I have added the identifier for the cell, but still the error exists.

Solution 1

It is because you haven't registered your xib to UICollectionView. If you are using UICollectionViewCell from Xib, you must register it first.

In viewDidLoad: 

write it:

if let xib = NSNib.init(nibNamed: "TemplateNBgCollectionItem", bundle: nil) {
   self.collectionView.register(xib, forItemWithIdentifier: NSUserInterfaceItemIdentifier(rawValue: "cvItem"))  
}

Solution 2

In viewDidLoad method: You must register your custom cell class/xib name with collectionView object.

If you have only class custom class then you register by following way (No xib file)

collectionView.register(CustomCell.self, forCellWithReuseIdentifier: "cellId")

If you have both class as well as xib file then you can register by this way

collectionView.register(UINib(nibName: "CustomCell", bundle: nil), forCellWithReuseIdentifier: "cellId")

Solution 3

From the code snippets you pasted, I don't see you register the cell before you want to dequeue/use it. Need to register the cell before use as the error described.

tableView.register(UITableViewCell.self, forCellReuseIdentifier: "DefaultCell")

For your quick reference, please see below post - https://www.hackingwithswift.com/example-code/uikit/how-to-register-a-cell-for-uitableviewcell-reuse

---

Edit after screenshot posted(Please accept this answer if works for you ^_^)

From the screenshot, you are using a custom cell class 'CustomCell', after you set the correct identifier, please make sure setup the correct class name as CustomCell in the identity inspector of right panel. Refer to below screenshot.

Solution 4

1. If you use cell in storyboard not XIB then you need to set reuseIDentifier as below

2. If you use separate XIB for cell then you need to add this line in ViewDidLoad

   collectionView.register(UINib(nibName: "NibName", bundle: nil), forCellWithReuseIdentifier: "reuseIdentifier")

View more solutions

Comments

[Sid]

I am sorry, but I am very new to this. When i tried your suggestion, I get the following error - Use of unresolved identifier 'collectionView'

[ankit]

oh thats because I have taken collectionView as dummy text. what you have to do is this: make an IBOutlet of UICollectionView named collectionView. Then you are good to go

[Sid]

Can you please tell me what exactly I need to do and where i need to put it. Sorry, but this is my first time doing all of this

[ankit]

Go to that controller on IB. Ctrl + drag to your this controller class. then when it prompts , use name : collectionView

[Aaron]

I see your screenshot after you update, just be careful when you connect the IBOutlet, and make sure the name is matched with your xib. or you can re-connect it to double check. Good Luck

[Saeed Rahmatolahi]

I used This But I still having problem with line let cell = calendar.dequeueReusableJTAppleDayCellView(withReuseIdentifi‌​er: "JTCustomCell", for: indexPath) as! JTCustomCell