Swift 2 IBDesignable Nib Tutorial / Boilerplate

NIBEXAMPLE.swift

/* 
  Start by creating two files (replace NIBEXAMPLE with w/e you want but make sure the names match):
  
    1, NIBEXAMPLE.xib 
      * File > New > File... > iOS > View
    2, NIBEXAMPLE.swift
      * File > New > File... > iOS > Cocoa Touch Class (Extends UIView)
  
  After creating the two files above, replace the default contents of your .swift file 
  with the code below. Be sure to update `class NIBEXAMPLE` and `nibName = "NIBEXAMPLE"` 
  to whatever you named your files.
  
  Open the .xib file in interface builder, click `File's Owner` and set the custom class to 
  NIBEXAMPLE (via identity inspector). Doing this will associate the swift class with the 
  view file. You can now open the two files side-by-side and ctrl+drag to create IBOutlets.
  
  Use `setup()` to define any custom logic which should be performed when the nib is created.
  
  Usage =>
    Interface Builder: 
      Create a View then set the custom class to NIBEXAMPLE (in identity inspector)
    Programmatically:
      let nibExample = NIBEXAMPLE(
        frame: CGRect(
          x: 0, 
          y: 0, 
          width: self.view.frame.width,
          height: self.view.frame.height
        )
      )
      self.view.addSubview(nibExample)
  
*/

import UIKit

@IBDesignable
class NIBEXAMPLE: UIView {
    
    // ======================================================================
    // MARK: - Vars
    // ======================================================================
    
    // immutables
    let nibName = "NIBEXAMPLE"
    
    // mutables
    var view:UIView!
    
    // ======================================================================
    // MARK: - Lifecycle
    // ======================================================================
    
    override init(frame: CGRect)
    {
        super.init(frame: frame)
        self.prepareNib()
    }

    required init?(coder aDecoder: NSCoder)
    {
        super.init(coder: aDecoder)
        self.prepareNib()
    }
    
    func prepareNib() -> Void
    {
        // get the nib, add to screen
        self.view = loadViewFromNib()
        self.view.frame = self.bounds
        self.view.autoresizingMask = [UIViewAutoresizing.FlexibleWidth, UIViewAutoresizing.FlexibleHeight]
        self.addSubview(self.view)
        
        // nib now ready for use
        self.setup()
    }

    func loadViewFromNib() -> UIView
    {
        let bundle = NSBundle(forClass: self.dynamicType)
        let nib = UINib(nibName: self.nibName, bundle: bundle)
        let xview = nib.instantiateWithOwner(self, options: nil)[0] as! UIView
        return xview
    }
    
    // ======================================================================
    // MARK: - Setup
    // ======================================================================
    
    func setup() -> Void
    {
        // nib is ready to use
    }
    
    
}