Scrolling NSScrollView programatically (swift 4.0, cocoa in macOS)

ViewController.swift

class ViewController {
  ...
  override func viewDidAppear() {
    ...
    
    // scrolling to top
    scrollView.documentView?.scroll(NSPoint(x: 0, y: documentView.bounds.size.height))
    
    // scrolling to bottom
    scrollView.documentView?.scroll(NSPoint.zero)
    
    ...   
  }
  ...
}