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Debugging iPad External Monitor Reconnection
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Debugging iPad External Monitor Reconnection


  • Subject: Debugging iPad External Monitor Reconnection
  • From: Gordon Apple <email@hidden>
  • Date: Sun, 12 Sep 2010 17:33:50 -0500
  • Thread-topic: Debugging iPad External Monitor Reconnection

External monitor code can be debugged in the simulator, but connection
related problems apparently cannot.  I have verified reception of
connect/deconnect messages by sending my own messages to a temp view in the
main screen.  If the monitor accidentally disconnects and is reconnected, I
attempt to reestablish and reconfigure everything, using the passes-in
screen parameters, but to no avail (blank screen, monitor indicates "no
signal").  This also happens if the iPad goes to sleep ( I have given the
user a "sleep inhibit" option).  Re-launching the app works, but is a
less-than-ideal, disruptive solution.

Steinberg/Freeman's iPad book states that this is "unreliable across
developer applications (as well as with some of the built-in applications,
such as YouTube)", leading me to believe it is either a system software or a
hardware issue (or maybe just a dumb developer issue).  However, Keynote
seems to accomplish it without problem, leading me to rule out hardware
issues.

Has anyone successfully been able to establish a screen reconnection in a
running app?  If so, any wisdom you can impart?  (I may file a support
incident on this otherwise.)


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