Table-CollectionView.swift

import Foundation

protocol ReusableView: class {
    static var identifier: String { get }
}

extension ReusableView where Self: UIView {
    static var identifier: String {
        return String(describing: self)
    }
}


protocol NibLoadableView: class {
    static var nibName: String { get }
}

extension NibLoadableView where Self: UIView {
    static var nibName: String {
        return String(describing: self)
    }
}


extension UICollectionView {
    func register<T: UICollectionViewCell>(_: T.Type) where T: ReusableView {
        register(T.self, forCellWithReuseIdentifier: T.identifier)
    }
    
    func register<T: UICollectionViewCell>(_: T.Type) where T: ReusableView, T: NibLoadableView {
        let bundle = Bundle(for: T.self)
        let nib = UINib(nibName: T.nibName, bundle: bundle)
        
        register(nib, forCellWithReuseIdentifier: T.identifier)
    }
    
    func dequeueReusableCell<T: UICollectionViewCell>(for indexPath: IndexPath) -> T where T: ReusableView {
        guard let cell = dequeueReusableCell(withReuseIdentifier: T.identifier, for: indexPath) as? T else {
            fatalError("Could not dequeue cell with identifier: \(T.identifier)")
        }
        return cell
    }
}


extension UITableView {
    func register<T: UITableViewCell>(_: T.Type) where T: ReusableView, T: NibLoadableView {
        let bundle = Bundle(for: T.self)
        let nib = UINib(nibName: T.nibName, bundle: bundle)
        register(nib, forCellReuseIdentifier: T.identifier)
    }
    
    func dequeueReusableCell<T: UITableViewCell>(for indexPath: IndexPath) -> T where T: ReusableView {
        guard let cell = dequeueReusableCell(withIdentifier: T.identifier, for: indexPath) as? T else {
            fatalError("Could not dequeue cell with identifier: \(T.identifier)")
        }
        return cell
    }
}