Custom UIButton class swift

Question

I was curious of how to create a custom class for a UI element (say for example, a button)?

I've read the Apple development docs and I followed the instructions, what I thought was to create a separate UIButton class file and link that class file for all buttons on the storyboard.

Here's the separate UIButton class code (file named buttonz.swift):

import UIKit

public class buttonz: UIButton {


    required public init?(coder aDecoder: NSCoder) {

        super.init(coder: aDecoder)

        self.layer.borderWidth = 1
        self.backgroundColor = UIColor.whiteColor()
        self.layer.borderColor = UIColor.blackColor().CGColor

    }

}

And on the storyboard, I linked that specific button to the new UIButton class:

The problem is that when I run the simulator, it gives me an error in the debig console:

this class is not key value coding-compliant for the key aButton

I thought the process was straightforward in the guide but am I missing any extra steps? Please let me know, thanks!

For reference, here is the link to the Apple docs that I used as a guide.

https://developer.apple.com/library/ios/referencelibrary/GettingStarted/DevelopiOSAppsSwift/Lesson5.html

Edit 1 - Here's the action link to the viewcontroller.swift for the view controller. I just ctrl + dragged the button from the story board into the viewcontroller.swift.

 @IBAction func a(sender: AnyObject) {
        var alertView = UIAlertView();
        alertView.addButtonWithTitle("Ok");
        alertView.title = "title";
        alertView.message = "message";
        alertView.show();
    }

Answer 1

Your code looks ok, I think it's a connection error. Open your storyboard file, select File's Owner (or the yellow circle on top of the view controller) and click on the "Connection Inspector" (arrow on the top right, which is the one next to the size inspector), to see all outlets at once. Look for !s which indicates a missing outlet.

If you're creating custom UIClasses I would suggest having a look at IBInspectables and IBDesignables, there is a lot about them, and enable you to do quite a bit through just storyboards, and it doesn't change your code all that much.

Some articles:

IBInspectable / IBDesignable - NSHipster

Creating a Custom View That Renders in Interface Builder - Apple

Enjoy :)