Simple Nibable protocol for simple initialization of views from nib

Nibable.swift

//
//  Nibable.swift
//
//  Created by Matěj Kašpar Jirásek on 12/08/16.
//  Copyright © 2016 Matěj Kašpar Jirásek. All rights reserved.
//

import UIKit

protocol Nibable {
    static var nibName: String { get }
}

extension Nibable where Self: UIView {

    static var nibName: String {
        return NSStringFromClass(self).components(separatedBy: ".").last!
    }

    static var nib: UINib {
        return UINib(nibName: Self.nibName, bundle: nil)
    }

    init(owner: AnyObject? = nil) {
        let views = Self.nib.instantiate(withOwner: owner, options: [:])
        for view in views {
            if let view = view as? Self {
                self = view
                return
            }
        }
        fatalError("Nib for class \(Self.nibName) could not be loaded!")
    }

}

This protocol extension allows us to simply initialize your custom views from nib, the only thing you need is that your custom view class conforms to the Nibable protocol and the nib must have same name as the custom class. Then you can initialize your view simply for example like this: YourView(owner: self)