How to programmatically make cocoa application active

Swift 4.2+ of @Arvin answer

NSRunningApplication.current.activate(options: [.activateIgnoringOtherApps, .activateAllWindows])

Look at [[NSApplication sharedApplication] activateIgnoringOtherApps : YES];.

For 10.6 or greater

[[NSRunningApplication currentApplication] activateWithOptions:(NSApplicationActivateAllWindows | NSApplicationActivateIgnoringOtherApps)];