How to bring NSWindow to front and to the current Space?

To bring your app to the front:

[NSApp activateIgnoringOtherApps:YES];

Swift:

NSApp.activateIgnoringOtherApps(true)

Swift 3:

NSApp.activate(ignoringOtherApps: true)

Perhaps you want:

  [self.window setCollectionBehavior: NSWindowCollectionBehaviorCanJoinAllSpaces];

Experiment with the other collection behaviors... I found NSWindowCollectionBehaviorMoveToActiveSpace was a bit buggy in 10.5 but it might be better now.