Proposed solution for #155 [BUG] iOS camera preview crashes when switching app

[lcuis]

This proposed solution solved my issue on iPhone SE 2020 through near-production installation through test-flight.

[AlexV525]

Please verify if it's still working without the regression: flutter/flutter#97199.

[lcuis]

Here is what I did to validate this on my iPhone SE 2020:

1. uninstall example app
2. run example app with the correction
3. open photo example
4. validate permission
   => camera preview displayed as expected

I did the same with uninstall for the tap video example. I got an additional permission request for the microphone and the camera preview also displayed as expected.

Is there another scenario you had in mind?

[AlexV525]

Is there another scenario you had in mind?

Yes, more cases like when previewing the captured picture then throwing the app back to the background and opening it again could cause related issues.

[lcuis]

I just tried the following with success on my iPhone SE 2020:

1. run plugin example app
2. take a picture (first example)
3. while staying on the taken image preview, switch to other app
4. switch back to example app
   => As expected, taken image preview is still displayed. Also, when going back, the camera preview is displayed as expected.

[AlexV525]

Please verify if the latest change still works fine.

[lcuis]

I confirm that the formatted version works as well for the mentioned scenarios on my iPhone SE 2020.