Allows you to put a UIView inside a Nib that gets loaded from another Nib

HasOwnNib.swift

//
//  HasOwnNib.swift
//  PlayingWithUI
//
//  Created by dr2050 on 6/19/16.
//  Copyright © 2016 Confusion Studios LLC. All rights reserved.
//
import UIKit


// NOTES:
// 1) Nib's owner is UIView conforming to HasOwnNib
// 2) Nib's first object after owner is a UIView (1st Subview)
// 3) 1st Subview will be automatically added to Nib's owner as subview
// 4) If you overwrite awakeFromNib, make sure to call super! Protocol is the super
protocol HasOwnNib {
	
	func nibName() -> String
	func bundle() -> NSBundle
}

extension UIView  {
	// this works if the type is specified with @objc(ViewName)
	func nibName() -> String {
		return String(self.dynamicType)
	}
	
	func bundle() -> NSBundle {
		return NSBundle.mainBundle()
	}
	
	public override func awakeFromNib() {
		if self is HasOwnNib {
			loadSelfFromNib()
		}
		super.awakeFromNib()
	}
	
	// Call from awakeFromNib
	// Class must be declared with @objc tag with same name as Nib
	func loadSelfFromNib() {
		let name =  nibName()
		let bundleObjects = bundle().loadNibNamed(name, owner: self, options: nil)
		let firstView = bundleObjects[0] as! UIView
		firstView.backgroundColor = UIColor.clearColor()
		firstView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
		firstView.frame = self.bounds
		self.addSubview(firstView)
	}
}