UICollectionView not displaying cells and crashing application Xcode 10.0

Question

I'm new to Xcode so apologies if I'm missing something obvious but I've been stuck on this for days now.

I've created a UICollectionView - collection view in storyboard

There are constraints in place 0 to each side of the view, and also one to the label above. The image and the label in the cell also have constraints.

when I run the application I get this - Running application

I'm not sure how that is possible given the constraints. But If I remove any constraint, edit the existing ones, or remove them entirely I'm just getting a SIGABRT exception.

I'm extremely confused, if my code is compiling and running, I'm assuming that the code populating the UICollectionView is working. Is there something

TestVC.swift

import UIKit

class TestVC: UIViewController, UICollectionViewDelegate,UICollectionViewDataSource {

@IBOutlet weak var myCollection: UICollectionView!

// making this an empty array incase the data hasn't loaded yet.
private(set) public var testArrays = [dataArrays]()

override func viewDidLoad() {
    super.viewDidLoad()

    myCollection.dataSource = self
    myCollection.delegate = self

}

func initData(category: Category){

    testArrays = DataService.instance.testData(forCategoryTitle: category.title)
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return testArrays.count
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionViewCell", for: indexPath) as? collectionViewCell{

        let testArray = testArrays[indexPath.row]
        cell.updateViews(testArray: testArray)
        return cell

    }

    return collectionViewCell()
}
}

collectionViewCell.swift

import UIKit

class collectionViewCell: UICollectionViewCell {

    @IBOutlet weak var cellImage: UIImageView!
    @IBOutlet weak var cellLabel: UILabel!


    func updateViews(dataarray: dataArrays) {
        cellImage.image = UIImage(named: dataarray.imageName)
        cellLabel.text = dataarray.title

    }
}

Answer 1

The Cell itself wasn't registered in the Attributes Inspector, I changed it to - collectionViewCell and now it's working.

I also has an issue with constraints, I wasn't reading the Output terminal entirely, being new to this it all looked a bit cryptic but I was able to troubleshoot through the output.

This was very helpful https://developer.apple.com/videos/play/wwdc2015/219/