Segment

xib-based

Adding NSSegmentedControl control to xib interface, change NSSegmentedControl 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 segment: HDSegmentedControl = {
        let segment = HDSegmentedControl(frame: NSRect(x: 100, y: 100, width: 120, height: 24))
        return segment
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.addSubview(segment)
    }

}