How do I disable the Show Tab Bar menu option in Sierra apps?

Question

I've got an app that uses a Toolbar in a NSWindow. I don't want users to be able to customize this toolbar for aesthetic reasons. In Sierra there's a new Menu option that gets inserted into "Menu > View" called Show Tab Bar. How do I disable this? Enabling it only seems to increase the tool bar's height as I don't have extra labels showing under the icons.

Rennes

Answer 1

On 10.12, you need to now set the following when the window is created as Tab Bar is now available by default:

[NSWindow setAllowsAutomaticWindowTabbing: NO];

The answer is the same in Swift and SwiftUI

func applicationWillFinishLaunching(_ notification: Notification) {
    NSWindow.allowsAutomaticWindowTabbing = false
}

Note that the call is made on the class NSWindow not on an instance of NSWindow

Rennes

On 10.15 this method no longer seems to exist. Instead you can set the tabbingMode of the window to .disallowed. Specifically adding window.tabbingMode = .disallowed to the applicationDidFinishLaunching method of the NSApplicationDelegate seems to work. – Seamy

The above comment is not true, it seems like they may have been trying to call allowsAutomaticWindowTabbing on an instance of a window rather than on NSWindow the class. In swift and swiftui you can still call NSWindow.allowsAutomaticWindowTabbing = false to remove these items entirely in all app windows rather than disabling them for individual windows. – Topside

Answer 2

You can also do this on IB, on the Window’s attributes inspector

Kimmie

Thanks a lot. This helped me. – Dodgem

where exactly this screen is located at? – Oneil

You can also do it programmatically using the following code window.tabbingMode = NSWindowTabbingModeDisallowed – Fescennine

Answer 3

To disable tabbing on individual windows call setTabbingMode:

if([window respondsToSelector:@selector(setTabbingMode:)]) {
    // this particular window doesn't support tabbing in Sierra.
    [window setTabbingMode:NSWindowTabbingModeDisallowed];
}

Comfy

Answer 4

If you don't want to compile against the latest frameworks, you can use the following code in your NSWindowsController sub classes:

Swift:

 override func awakeFromNib() {
     if NSAppKitVersionNumber > 1500 {
        self.window?.setValue(2, forKey: "tabbingMode")
     }
 }

Objective-C:

- (void)awakeFromNib {
    if (NSAppKitVersionNumber > 1500) {
        [self.window setValue:[NSNumber numberWithInt:2] forKey:@"tabbingMode"];
    }
}

Suboxide

It's NSAppKitVersion.current.rawValue > NSAppKitVersion.macOS10_12.rawValue with Swift 4 – Roslynrosmarin

@ctietze: my answer os only relevant when using older versions of Xcode and Swift – Suboxide

Answer 5

Swift solution:

override func awakeFromNib() {
    super.awakeFromNib()
    if #available(OSX 10.12, *) {
        tabbingMode = .disallowed
    }
}

Nilson

Or, if you have an app delegate, add the line window.tabbingMode = .disallowed after the NSWindow has been created. – Seamy

Answer 6

Swift 5

In your NSWindowController:

self.window?.tabbingMode = .disallowed

Kendy