set NSWindow focused

I have an app winth one window and one panel, attached to this window.

steps:

1. deactivate my app (app opened, but without the focus)
2. click on a button on panel (panel is focused now, but main window is not)

How to set focus to the main window 开发者_如何学运维(parent window) from the panel?

Swift 5 version of @BUDDAx2 answer:

NSApplication.shared.activate(ignoringOtherApps: true)

It is not clear what you mean by focus, and whether what you call main window is a main window as defined in Cocoa. Assuming it is a Cocoa main window and focus is the same as key status,

[[NSApp mainWindow] makeKeyWindow];

or

[[NSApp mainWindow] makeKeyAndOrderFront:self];

If it is not a Cocoa main window, you need to have a reference to it and send it -makeKeyWindow or -makeKeyAndOrderFront:.