Cell+CellIdentifier.swift

import UIKit

public protocol Reusable: class {
    static var reuseIdentifier: String { get }
}

extension UITableViewCell: Reusable {
    public static var reuseIdentifier: String {
        return NSStringFromClass(self)
    }
}

extension UICollectionViewCell: Reusable {
    public static var reuseIdentifier: String {
        return NSStringFromClass(self)
    }
}

protocol CellRegisterable {
    associatedtype DefaultCell
    func register(_ cellClass: AnyClass?, forCellReuseIdentifier identifier: String)
    func dequeueReusableCell(withIdentifier identifier: String, for indexPath: IndexPath) -> DefaultCell
}

extension CellRegisterable {
    func register(_ cellClass: Reusable.Type) {
        register(cellClass, forCellReuseIdentifier: cellClass.reuseIdentifier)
    }

    func dequeue<Cell: Reusable>(_ cellClass: Cell.Type, for indexPath: IndexPath) -> Cell? {
        return dequeueReusableCell(withIdentifier: cellClass.reuseIdentifier, for: indexPath) as? Cell
    }
}

extension UITableView: CellRegisterable {}

extension UICollectionView: CellRegisterable {
    func register(_ cellClass: AnyClass?, forCellReuseIdentifier identifier: String) {
        register(cellClass, forCellWithReuseIdentifier: identifier)
    }

    func dequeueReusableCell(withIdentifier identifier: String, for indexPath: IndexPath) -> UICollectionViewCell {
        return dequeueReusableCell(withReuseIdentifier: identifier, for: indexPath)
    }
}