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Part of flutter/flutter#176957 Migrated SceneDelegate.swift to use UI scene using this guideline https://docs.flutter.dev/release/breaking-changes/uiscenedelegate#migration-guide-for-flutter-apps for ios_books app <img width="1931" height="1080" alt="image" src="https://github.com/user-attachments/assets/425f7cee-205b-4cf5-82fa-d95ff8227c1e" /> While testing this sample locally, I noticed a separate existing issue in `IosBooks/ViewController.swift`: the Google Books response is force-unwrapped. The unauthenticated request currently returns HTTP 429/quota errors in some environments, so `json["items"] as! [[String: Any]]` can crash at runtime. I kept this PR scoped to the UIScene migration only, but I can file or send a separate follow-up to make the sample parse the API response defensively, WDYT? ## Pre-launch Checklist - [x] I read the [Flutter Style Guide] _recently_, and have followed its advice. - [x] I signed the [CLA]. - [x] I read the [Contributors Guide]. - [x] I have added sample code updates to the [changelog]. - [x] I updated/added relevant documentation (doc comments with `///`). If you need help, consider asking for advice on the #hackers-devrel channel on [Discord]. <!-- Links --> [Flutter Style Guide]: https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md [CLA]: https://cla.developers.google.com/ [Discord]: https://github.com/flutter/flutter/blob/master/docs/contributing/Chat.md [Contributors Guide]: https://github.com/flutter/samples/blob/main/CONTRIBUTING.md [changelog]: ../CHANGELOG.md Co-authored-by: Eric Windmill <eric@ericwindmill.com>