I can appreciate the desire to limit the proliferation of permission dialogs, but this seems like a case where the implications are different enough to warrant

I can appreciate the desire to limit the proliferation of permission dialogs, but this seems like a case where the implications are different enough to warrant a separate one from the camera dialog. This has some similarities to the location permission dialog, which was updated in iOS 11 to differentiate between "allow always" and "allow while using the app." Perhaps the camera permission dialog could be updated to "allow continuous access" and "allow when taking photos."