EXC_BAD_INSTRUCTION when extending UIView

Question

I'm trying to create my own custom view class for a keyboard I'm playing around with for iOS8 and when I create a new class that extends UIView I crash with the Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP,subcode=0x0) error when the loading the keyboard. The error is shown on the line class KeyButton: UIView {, and I'm struggling to debug this much further. I was originally trying to extend UIButton but that didn't work so I changed it to UIView with no further luck.

I know there will be a few teething issues with Swift/iOS8, but hopefully this is fixable!

Edit

Full class code:

import UIKit

class KeyButton: UIView { /* This is where the app crashes, apparently */

    init(frame: CGRect) {
        super.init(frame: frame)
        // Initialization code
    }

    /*
    // Only override drawRect: if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func drawRect(rect: CGRect)
    {
        // Drawing code
    }
    */

}

Answer 1

I had a similar issue recently, but figured it out. As it turns out, in iOS 8, but not iOS 7, initWithCoder (in Objective-C) is required. All you have to do is add the following to your class:

init(coder aDecoder: NSCoder!)
{
    super.init(coder: aDecoder)
}

I hope that helps!