Qt Widgets under iOS with projector

[Gerhard]

Dear all,

Can one of you possibly help me with following problem:

I have built an iOS-App with QT-Widgets-Framework (Qt 5.6) . The App runs without any problems on my iPad.

I would like to connect the iPad with an external monitor / projector via “Lighning – VGA – Adapter” in order to present the App on a bigger scale.

Before I start my App, the whole iPad screen is mirrored on the external screen.

However, as soon as I start the App, the external screen turns black.

I have tried to localize the problem.

After the QApplication initialization the screen turns blank.

Unfortunately I do not have a clue how to solve this issue – Does one of you have an idea?

Maybe special parameters for initialization are to be set? If so, what / which are these?

Thanks a lot

[mrjj]

Hi
That sounds very odd.
Did you test with other non Qt apps to check it does work ?

[SGaist]

Hi,

Might be related to QTBUG-56768.

[Gerhard]

Hi,

is there any workaround ?

[SGaist]

Not that I know of yet, sorry.

[mrjj]

@Gerhard
It seems it works with Qt 5.5.
"Doing the same thing with Qt5.5 works."

So that is the only workaround. Using that version.