UICollectionView extension to easily register/dequeue cells

UICollectionView+Registration.swift

import UIKit

protocol UICollectionViewRegisterable {
    static var cellIdentifier: String { get }
    static var cellNib: UINib { get }
}

extension UICollectionView {
    func register(type: UICollectionViewRegisterable.Type) {
        register(type.cellNib, forCellWithReuseIdentifier: type.cellIdentifier)
    }

    func dequeueCell<CellType: UICollectionViewRegisterable>(at indexPath: IndexPath) -> CellType {
        guard let cell = dequeueReusableCell(withReuseIdentifier: CellType.cellIdentifier, for: indexPath) as? CellType else {
            fatalError("UICollectionView should dequeue a cell of type \(CellType.self)")
        }
        return cell
    }
}