Button

xib-based

Adding NSButton control to xib interface, change NSButton custom class to component class name of your exported.

code-based

Declare lazy load variable in the controller class and add it to the view.

import Cocoa

class ViewController: NSViewController {

    lazy var button: HDRoundButton = {
        let btn = HDRoundButton(frame: NSRect(x: 100, y: 100, width: 80, height: 30))
        return btn
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.addSubview(button)
    }
    
}