The judgment of whether it is the Android platform is a question

final isAndroid = Theme.of(context).platform == TargetPlatform.android;

I need to swipe back or center the title of the appbar, or some other IOS feature to use on Android
so I set the `ThemeData` platform is `TargetPlatform.iOS`.
i think you should use `defaultTargetPlatform` or `Platform.isAndroid` to judgment the device os

Start by locating the Chewie code that checks Theme.of(context).platform and compare it with the platform-detection alternatives named in the issue. Reproduce the behavior with ThemeData.platform set to TargetPlatform.iOS on Android, then verify that Android-specific behavior still follows the device platform rather than the theme setting.

Written by the indexing model from the issue text.