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cocoaappkitnssplitviewnssplitviewcontroller

NSSplitViewController doesn't collapse when created from a Storyboard

I am trying to mimick the behaviour of apps like Notes and Contacts, where when I resize the window the left split view item collapses. I can't recreate this behaviour when using a Storyboard.

If I create the NSSplitViewController in code this works fine, however if I do it via a Storyboard it doesn't work.

import Cocoa

class MainWindowController: NSWindowController {
    override var windowNibName: NSNib.Name? {
        return "MainWindowController"
    }

    override func windowDidLoad() {
        super.windowDidLoad()

//        let splitViewController = NSSplitViewController()
        let splitViewController = NSStoryboard(name: "Storyboard", bundle: nil).instantiateInitialController() as! NSSplitViewController

        let sidebarSplitViewItem = NSSplitViewItem(sidebarWithViewController: SidebarViewController())
        splitViewController.addSplitViewItem(sidebarSplitViewItem)

        let contentSplitViewItem = NSSplitViewItem(viewController: ContentViewController())
        splitViewController.addSplitViewItem(contentSplitViewItem)

        contentViewController = splitViewController
    }    
}

I can't tell if this is a bug or if there is a property I'm missing on NSSplitViewController when it comes from a Storyboard to get the collapse behaviour to work.

Code:

Code

Storyboard:

Storyboard

Solution

  • (Answering my own question)

    I received feedback from Apple about the Radar I filed for this. I can confirm the issue has now been fixed as of macOS Catalina beta 5.