Documentation - NSTextView

Text View

xib-based

Adding NSTextView control to xib interface, change its 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 textView: HDTextView = {
        let textView = HDTextView()
        textView.isVerticallyResizable = true
        textView.isHorizontallyResizable = false
        textView.autoresizingMask = .width
        textView.textContainer?.widthTracksTextView = true
        textView.isEditable = true
        return textView
    }()
    
    lazy var scrollView: NSScrollView = {
        let scrollView = NSScrollView(frame: NSRect(x: 100, y: 100, width: 80, height: 80))
        scrollView.hasVerticalScroller   = true
        scrollView.hasHorizontalScroller = false
        scrollView.focusRingType = .none
        scrollView.autohidesScrollers = true
        scrollView.borderType = .noBorder
        scrollView.autoresizingMask = [.width , .height]
        return scrollView
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        scrollView.documentView = textView
        textView.frame = NSRect(origin: NSZeroPoint, size: scrollView.contentSize)
        self.view.addSubview(scrollView)
    }
}