How to enable upside down orientation on flutter for iOS?

Issue

I am trying to enable upside-down portrait mode on flutter app for ios. All orienations are enabled in the app:

SystemChrome.setPreferredOrientations([
      DeviceOrientation.portraitUp,
      DeviceOrientation.portraitDown,
      DeviceOrientation.landscapeRight,
      DeviceOrientation.landscapeLeft,
    ]);

All the orientation are also enabled on ios project settings through Xcode:

<key>UISupportedInterfaceOrientations</key>
    <array>
        <string>UIInterfaceOrientationPortrait</string>
        <string>UIInterfaceOrientationLandscapeRight</string>
        <string>UIInterfaceOrientationPortraitUpsideDown</string>
        <string>UIInterfaceOrientationLandscapeLeft</string>
    </array>

For some reason on iOS upside-down portrait mode is not working.
Any ideas on what might be wrong is highly appreciated

Solution

Apple doc

All iPadOS devices support the portraitUpsideDown orientation. It’s
best practice to enable it for the iPad idiom. iOS devices without a
Home button, such as iPhone 12, don’t support this orientation. You
should disable it entirely for the iPhone idiom.

Do you test this feature on a proper ios device?

Answered By – Eugene Kuzmenko

Answer Checked By – David Goodson (FlutterFixes Volunteer)