Instantiate NSView with custom objects in it using NSNib

Question

I have a subclass of NSView called MyView, and I have a nib file whose File's Owner is MyView. I would like to create copies of a view in my nib file, and so I am using a class function as shown below:

class MyView: NSView {

    @IBOutlet var myImageView: NSImageView! // Cocoa class
    @IBOutlet var myEditingField: EditingField! // Custom subclass of cocoa object

    class func initWithTitle(_ title: String) -> MyView {
        let myNib = NSNib(nibNamed: "MyView", bundle: nil)

        var myArray = NSArray()

        myNib!.instantiate(withOwner: self, topLevelObjects: &myArray) // instantiate view and put in myArray

        var myViewInstance = myArray[0] as! MyView

        myViewInstance.imageView.image = NSImage(named: title)
        myViewInstance.myEditingField.stringValue = title // this line

        return myViewInstance
    }

}

I have connected an IBOutlet from an NSImageView in the view in my nib file to the property myImageView in the MyView class, and I have connected an IBOutlet from an EditingField, a custom subclass of NSTextField that I wrote, to the myEditingField property. So, to create an instance of MyView simply I do:

let instance = MyView.initWithTitle("foo")

The issue with this method is that when IB creates the view, it is calling the required initializer init(coder:) on the EditingField in the view in the nib file. Originally, I had left my implementation of init(coder:) as simply the default fatalError("init(coder:) is not implemented") because I didn't think IB would call that initializer. I had figured IB would call init(frame:), but in reality it does call init(coder:). So, I tried implementing init(coder:) the following way:

class EditingField: NSTextField {
    var id: String
    // ... other properties 

    required init?(coder: NSCoder) {
        print("init coder")

        self.id = "default"
        // ... other properties get default values, just like id

       super.init(coder: coder)
    }
}

Unfortunately, this did not work either. When I run the project using the above initializer in EditingField, the line myViewInstance.myEditingField.stringValue = title in MyView throws an error. When this happens, the debugger console reveals that the property myEditingField is nil, and, unlike myImageView, hasn't been initialized at all (despite the fact that the print message in init(coder:) still prints!)

So, my questions are (1) how do I initialize/create an NSView from a nib file that has custom objects in it? (2) why does IB call init(coder:) on EditingField? and (3) why is myEditingField nil despite the print message suggesting that the initializer ran?