[Interest] black screen with iOS app over airplay?

[Patrick Stinson]

Hmm. This did not work for me and I am starting to realize that there are more problems in the Qt code than we may be aware.

One problem, and maybe the main problem, is that Qt seems to incorrectly rely on the OS view that is created when the app is created, but this view doesn’t persist when airplay is engaged or when it is disengaged. I think any of us could see this problem when you disable airplay mirroring while running a Qt app and the app crashes.

This problem also appears to prevent Reflector 2 from showing the mirrored view of the iPad app when running the Qt app, which I can only interpret to mean that the Qt view is not complying with the OS’s standardized view API. Reflector works fine when another app or launchpad (desktop) is shown.

So there is some work to do here…I wish I was better with UIKit to troubleshoot.


> On May 12, 2017, at 2:11 PM, bralchenko at ics.com wrote:
> 
> Yes, I think that’s the one. 
> 
> 
> Regards,
>     Boris Ralchenko.
> 
> 
> 
> 
> 
>> On May 12, 2017, at 5:08 PM, Patrick Stinson <patrickkidd at gmail.com <mailto:patrickkidd at gmail.com>> wrote:
>> 
>> Do you mean QMainWindow? That is the class that I am deriving from.
>> 
>> On May 12, 2017, at 1:38 PM, bralchenko at ics.com <mailto:bralchenko at ics.com> wrote:
>> 
>>> On main window, in our case it was derived from QQuickView. 
>>> 
>>> Regards,
>>>     Boris Ralchenko.
>>> 
>>> 
>>> 
>>> 
>>> 
>>>> On May 12, 2017, at 4:33 PM, Patrick Stinson <patrickkidd at gmail.com <mailto:patrickkidd at gmail.com>> wrote:
>>>> 
>>>> Oh excellent. Which object do you call setGeometry on?
>>>> 
>>>> On May 12, 2017, at 1:13 PM, bralchenko at ics.com <mailto:bralchenko at ics.com> wrote:
>>>> 
>>>>> Patrick,
>>>>> 
>>>>> you have to setGeometry(QRect screenGeometry) explicitly. screenGeometry should be queried from iOS directly, like this:
>>>>> 
>>>>> const CGRect r = [[UIScreen mainScreen] bounds];
>>>>> return QRect(0, 0, r.size.width, r.size.height);
>>>>> 
>>>>> 
>>>>> We had similar problem, black screen with AirPlay or with HDMI dongle. This solved it for us.
>>>>>    
>>>>> Regards,
>>>>>     Boris Ralchenko.
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>>> On May 11, 2017, at 9:16 PM, Patrick Stinson <patrickkidd at gmail.com <mailto:patrickkidd at gmail.com>> wrote:
>>>>>> 
>>>>>> Hello! Has anyone else had a problem with Qt apps only showing as a black screen when mirroring an iOS device over airplay? Other apps display fine, but then the AirPlay display turns black when the Qt app is brought to the front.
>>>>>> 
>>>>>> Granted, I am using Reflector 2 to show the iPad screen on my Mac with latest macOS Sierra, (in order to show the iPad on a projector), but it just uses the AirPlay protocol on the iOS end so I assume it is a problem with the Qt iOS view.
>>>>>> 
>>>>>> Thanks!_______________________________________________
>>>>>> Interest mailing list
>>>>>> Interest at qt-project.org <mailto:Interest at qt-project.org>
>>>>>> http://lists.qt-project.org/mailman/listinfo/interest <http://lists.qt-project.org/mailman/listinfo/interest>
>>>>> 
>>> 
> 

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