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

Question

I have been trying to show hide window on close(red button) click on the window. I would like to do is hide the window and when a user clicks on my app again it will show again.

Thanks in advance to all the developers who provide an answer. I am new to Cocoa apps. I am iOS developers so I have not much knowledge about cocoa apps.

I tried to hide( :) method and orderOut( :) method too. but not working.

class ViewController : NSViewController, NSWindowDelegates {

    override func viewDidAppear() {
         self.view.window?.delegate = self
    }

    func windowShouldClose(_ sender: NSWindow) -> Bool {
         //NSApplication.shared.terminate(self)
         //NSApp.hide(self)
         //self.view.window?.orderOut(sender)
        return false
    }
}

I want to create a timer app which runs in the background if user click on close it will hide instead of terminating. and when he clicks again from dock menu it will reopen the window.

Answer 1

I'm not much into Mac OS development, but I think you should inherit from NSWindowController like this:

class MyWindowController: NSWindowController, NSWindowDelegate {

    func windowShouldClose(_ sender: NSWindow) -> Bool {
        NSApp.hide(nil)
        return false
    }
}

Then you need just open your Main (or whatever name you have) storyboard, choose Window Controller and set your MyWindowController to it:

I tried and it worked for me.

Answer 2

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.