GCMouseInput doesn’t call the mouseMovedHandler reliably

[conath]

This means when not running from Xcode the mouse pointer won’t move until the app has been minimised and opened again. The whole thing seems like a race condition to me.
Maybe it can be worked around by waiting for a GCMouseDidBecomeCurrentNotification.

[conath]

I filed a Feedback Report (FB9088388) with Apple on 25th of April about this issue. I discovered today that the report has been marked as "investigation complete - works as designed", with no further information given.

[conath]

Yesterday, Apple Engineering added the following reply to the Feedback Report.

After reviewing your feedback, we have some additional information for you, or some additional information, or action is necessary for this issue:

Thanks for the feedback and apologies for the delayed response.

Looking at the attached project, the best practice here is to switch either to:

GCMouseDidConnectNotification/GCMouseDidDisconnectNotification

or:

GCMouseDidBecomeCurrentNotification/GCMouseDidStopBeingCurrentNotification

... notifications and then check the GCMouse.current property, to see if one is already connected.

‘.current’ methods on its own could be used for a poll model input in the update loop. We’ll improve the documentation to make it clearer.

I would like to thank Apple for their reply.

This confirms my suspicion about the CGMouse API race condition with viewDidAppear, and I will update the project to use the notifications instead.