Create macOS SideBar in Swift

Last night I started digging into building a SideBar for Pra.

Finder Screenshot

Sadly, I struggled to find a decent example of how to programmatically create a SideBar in Swift for macOS.

After a little bit of trial and error the following is the working solution I came up with.

import Cocoa

extension NSSplitViewController {
  convenience init(sideBarViewController: NSViewController, contentViewController: NSViewController) {
    self.init(nibName: nil, bundle: nil)

    let sideBarSplitViewItem = NSSplitViewItem(sidebarWithViewController: sideBarViewController)
    let contentSplitViewItem = NSSplitViewItem(viewController: contentViewController)


Pra with SideBar