Swift custom control is not showing when being used in view controller (code attached)

Question

When I try to use this custom control within my main view controller, by dragging a UIView onto screen in IB and setting it to "CustomerControlView", it doesn't actually show it.

Question - What is wrong with the code I have here?

Background - So wanting to basically: a) design a customer control in IB b) so I'm assuming I create the NIB file and then create a UIView file, so this is what I've done

Screenshot of NIB & swift file

Code

import UIKit

class CustomControlView: UIView {

//    @IBOutlet var icon: UIImageView!
//    @IBOutlet weak var view: UIView!

    @IBOutlet weak var button: UIButton!
    @IBOutlet weak var text1: UITextField!
    @IBOutlet weak var text2: UITextField!

    override init(frame: CGRect) {
        print("override init(frame: CGRect) ")
        super.init(frame: frame)
    }

    required init?(coder aDecoder: NSCoder) {
        print("required init?(coder aDecoder: NSCoder)")
        super.init(coder: aDecoder)

//        let arr = NSBundle.mainBundle().loadNibNamed("CustomControlView", owner: nil, options: nil)
//        let v = arr[0] as! UIView
//        self.view.addSubview(v)
    }


}

Snapshot showing how I have included the custom view into my main viewController view:

Answer 1

Just add @IBDesignable above the class line to tell Xcode to compile it before showing it in storyboard. There is a great discussion on this subject here: http://nshipster.com/ibinspectable-ibdesignable/

Also, you need to make sure that the NIB is being loaded:

override init(frame: CGRect) {
    print("override init(frame: CGRect) ")
    super.init(frame: frame)
    xibSetup()
}

required init?(coder aDecoder: NSCoder) {
    print("required init?(coder aDecoder: NSCoder)")
    super.init(coder: aDecoder)

    xibSetup()

}


func xibSetup() {
    view = loadViewFromNib()
    view.frame = bounds
    view.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
    addSubview(view)
}

func loadViewFromNib() -> UIView {
    let bundle = NSBundle(forClass: self.dynamicType)
    let nib = UINib(nibName: "CustomNumberPad", bundle: bundle)
    let view = nib.instantiateWithOwner(self, options: nil)[0] as! UIView
    return view
}