Tab View

xib-based

Drag NSTabView control to xib interface from control libraries, change control 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 tabView: HDTabView = {
        let tabView = HDTabView(frame: NSRect(x: 100, y: 100, width: 300, height: 200))
        return tabView
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.addSubview(tabView)
    }

}