Show and Hide Window Instead of Terminating App on Close Click in Cocoa App

Show and hide window instead of terminating app on close click in cocoa app

I have found solution. Thanks to @Silvester suggestion to present NSViewController.
On button click event :

@IBAction func onButtonClick(_ sender: VSButton) {
    let animator = ReplacePresentationAnimator()
    let vc = self.storyboard?.instantiateController(withIdentifier: "identifier") as! yourVC
    present(vc, animator: animator) 
}

Custom animator class :

  class ReplacePresentationAnimator: NSObject, NSViewControllerPresentationAnimator {

        func animatePresentation(of viewController: NSViewController, from fromViewController: NSViewController) {
            if let window = fromViewController.view.window {
                NSAnimationContext.runAnimationGroup({ (context) -> Void in
                fromViewController.view.animator().alphaValue = 0
            }, completionHandler: { () -> Void in
                viewController.view.alphaValue = 0
                window.contentViewController = viewController
                viewController.view.animator().alphaValue = 1.0
                })
            }
        }

        func animateDismissal(of viewController: NSViewController, from fromViewController: NSViewController) {
            if let window = viewController.view.window {
                NSAnimationContext.runAnimationGroup({ (context) -> Void in
                viewController.view.animator().alphaValue = 0
            }, completionHandler: { () -> Void in
                fromViewController.view.alphaValue = 0
                window.contentViewController = fromViewController
                fromViewController.view.animator().alphaValue = 1.0
                })
            }
        }
    }

This will work perfectly with Silvester MyWindowController. Thank you.

OS X design decisions. Terminate the app on last window close?

Per Apple's Human Interface Guidelines (a guide for Mac developers):

In most cases, applications that are
not document-based should quit when
the main window is closed. For
Example, System Preferences quits if
the user closes the window. If an
application continues to perform some
function when the main window is
closed, however, it may be appropriate
to leave it running when the main
window is closed. For example, iTunes
continues to play when the user closes
the main window.

macCatalyst app: how to close a window without terminating the app?

I've discussed the problem with Apple technical developer support. After a long discussion, they accepted that this is a bug on Apple side. It's escalated to the engineering team.

UPDATE:
Apple Engineering team has provided the following information regarding this issue and it worked for me:

We were able to prevent the quitting behavior by adding NSSupportsAutomaticTermination = NO to info.plist

Closing frontmost window in Cocoa in an app without a menu bar

If you put a File > Close menu item in your MainMenu nib, the shortcut will work, even though the menu isn't visible.

If you choose to implement an app-wide listener for the shortcut instead, you can get rid of the beep by returning nil from the block, so that the original event doesn't get passed on.

Cocoa : Hide any window using accessibility

You can't do that to a window using Accessibility. You can set the AXHidden of an AXApplication, or the AXMinimized of an AXWindow, but you can't simply hide (set AXHidden of) an AXWindow.

How to hide window of UIAgent process with cocoa

I solved it with NSDistributionNotifications. In the UIAgent application I add an observer to a @"QuitProcessNotification" (any other name):

[[NSDistributedNotificationCenter defaultCenter]
                             addObserver:self selector:@selector(quit:) 
                             name:@"QuitProcessNotification" 
                             object:@"com.MyCompany.MyApp" 
                             suspensionBehavior:NSNotificationSuspensionBehaviorDeliverImmediately];

The callback looks like that:

- (void) quit:(NSNotification *) notification
{
    [NSApp terminate:nil];
}

In the main application:
Sending notification:

[[NSDistributedNotificationCenter defaultCenter]
                     postNotificationName:@"QuitProcessNotification" 
                     object:@"com.MyCompany.MyApp"
                     userInfo: nil /* no dictionary */
                     deliverImmediately: YES];

Be sure, that the object parameter is indeed your sender application's bundle identifier.

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