UIView+FromNib.swift

import UIKit

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

extension NibBased {
    
    static var nibName: String {
        return String(describing: self)
    }
}

extension NibBased where Self: UIView {
    
    static func fromNib() -> Self {
        
        let bundle = Bundle(for: self)
        guard let nibs = bundle.loadNibNamed(nibName, owner: nil, options: nil) else {
            fatalError("No nibs named '\(nibName)' were found in this bundle")
        }
        
        if nibs.count > 1 {
            fatalError("More than one nib named '\(nibName)' was found in this bundle")
        }
        
        guard let instance = nibs.first as? Self else {
            fatalError("The view found in nib named '\(nibName)' was not the correct type, '\(self)'")
        }
        
        return instance
    }
}