An easier way to dequeue cells in iOS

Genrics+CellReuse.swift

import Foundation
import UIKit
public protocol ReusableView: class {
    static var defaultReuseIdentifier: String { get }
}

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

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

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

// UICollectionView + Reusable Cell
extension UICollectionView {
    func register<T: UICollectionViewCell>(_: T.Type) where T: ReusableView {
        register(T.self, forCellWithReuseIdentifier: T.defaultReuseIdentifier)
    }

    func register<T: UICollectionReusableView>(_: T.Type, forSupplementaryViewOfKind kind: String) where T: ReusableView {
        register(T.self, forSupplementaryViewOfKind: kind, withReuseIdentifier: T.defaultReuseIdentifier)
    }

    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.defaultReuseIdentifier)
    }

    func dequeueReusableCell<T: UICollectionViewCell>(for indexPath: IndexPath) -> T where T: ReusableView {
        register(T.self)
        guard let cell = dequeueReusableCell(withReuseIdentifier: T.defaultReuseIdentifier, for: indexPath) as? T else {
            fatalError("Could not dequeue cell with identifier: \(T.defaultReuseIdentifier)")
        }
        return cell
    }

    func dequeueReusableCell<T: UICollectionViewCell>(for indexPath: IndexPath) -> T where T: ReusableView, T: NibLoadableView {
        register(T.self)
        guard let cell = dequeueReusableCell(withReuseIdentifier: T.defaultReuseIdentifier, for: indexPath) as? T else {
            fatalError("Could not dequeue cell with identifier: \(T.defaultReuseIdentifier)")
        }
        return cell
    }

    func dequeueReusableSupplementaryView<T: UICollectionReusableView>(ofKind kind: String, for indexPath: IndexPath) -> T where T: ReusableView {
        register(T.self, forSupplementaryViewOfKind: kind)
        guard let cell = dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: T.defaultReuseIdentifier, for: indexPath) as? T else {
            fatalError("Could not dequeue reusable supplementaryView with identifier: \(T.defaultReuseIdentifier)")
        }
        return cell
    }
}

// UITableView + Reusable cell
extension UITableView {
    func register<T: UITableViewCell>(_: T.Type) where T: ReusableView {
        register(T.self, forCellReuseIdentifier: T.defaultReuseIdentifier)
    }

    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.defaultReuseIdentifier)
    }

    func dequeueReusableCell<T: UITableViewCell>(for indexPath: IndexPath) -> T where T: ReusableView, T: NibLoadableView {
        register(T.self)
        guard let cell = dequeueReusableCell(withIdentifier: T.defaultReuseIdentifier, for: indexPath) as? T else {
            fatalError("Could not dequeue cell with identifier: \(T.defaultReuseIdentifier)")
        }
        return cell
    }

    func dequeueReusableCell<T: UITableViewCell>(for indexPath: IndexPath) -> T where T: ReusableView {
        register(T.self)
        guard let cell = dequeueReusableCell(withIdentifier: T.defaultReuseIdentifier, for: indexPath) as? T else {
            fatalError("Could not dequeue cell with identifier: \(T.defaultReuseIdentifier)")
        }
        return cell
    }

    func registerReusableHeaderFooterView<T: UITableViewHeaderFooterView>(_: T.Type) where T: ReusableView, T: NibLoadableView {
        let bundle = Bundle(for: T.self)
        let nib = UINib(nibName: T.nibName, bundle: bundle)
        register(nib, forHeaderFooterViewReuseIdentifier: T.defaultReuseIdentifier)
    }

    func dequeueReusableHeaderFooterView<T: UITableViewHeaderFooterView>() -> T where T: ReusableView {
        register(T.self, forHeaderFooterViewReuseIdentifier: T.defaultReuseIdentifier)
        guard let cell = dequeueReusableHeaderFooterView(withIdentifier: T.defaultReuseIdentifier) as? T else {
            fatalError("Could not dequeue Reusable HeaderFooterView with identifier: \(T.defaultReuseIdentifier)")
        }
        return cell
    }
}