Show window on multiple displays on os x

Question

Basic idea: The window will be show for x seconds every n minutes on all displays. To "force" the user to take a break.

My problem is to get the window to show on all displays, how can this be done with swift?

Instead of trying to have one window show on every display, you should consider having one window per display. — zneak, Mar 27 '16 at 18:56
hmm so one instance per display, also an option do you have a guid for designation/assigning a window to a display ? — Lars Nielsen, Mar 27 '16 at 18:57
NSWindow has an initializer that accepts a `NSScreen` argument. After the fact, you can also [do shenanigans to move the window to another screen](http://stackoverflow.com/questions/16658582/how-to-move-nswindow-to-a-particular-screen). — zneak, Mar 27 '16 at 18:59
If System Preferences > Mission Control > Displays have separate Spaces is enabled, then windows **can't** span multiple screens. See the [the 10.9 AppKit release notes](https://developer.apple.com/library/mac/releasenotes/AppKit/RN-AppKitOlderNotes/#10_9Spaces). — Ken Thomases, Mar 27 '16 at 19:05
@zneak I may be completely stupid, but can I do the screen solution via a WindowController, pass that as a parameter along side the nib file name for the window ? — Lars Nielsen, Mar 29 '16 at 09:50
@LarsNielsen maybe :) I didn't post an answer because I'm not completely sure of the mechanics, but I still thought that I could be somewhat helpful. — zneak, Mar 29 '16 at 14:17

score 0 · Accepted Answer · edited May 23 '17 at 11:45

Unless the user has their desktop Mirrored there is no way to display one NSWindow on all screens.

The only way to do this is to pretty much create a new window for each screen.

If your NSWindowController, NSWindow etc... complies with NSCopying, just copy it and take a look at this post regarding displaying NSWindows in various screens:

How to change the NSScreen a NSWindow appears on

Hope this helps.

Show window on multiple displays on os x

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