[iOS] Trackpad scroll gestures are not handled, impacts new macOS Sequoia iPhone Mirroring feature #153897
Description
The iOS embedder should correctly handle trackpad scroll gestures.
This has the knock-on effect that trackpad scroll gestures do not work in Flutter apps when used via iPhone Mirroring in macOS Sequoia/iOS 18.
Repro steps
- Create an iOS app with a scroll view.
- Launch on an iPad with a trackpad paired (e.g. Magic Keyboard)
- Use a two-finger swipe gesture to scroll.
Expected behaviour: the primary scroll view scrolls.
Actual behaviour: the scroll gesture is ignored.
Flutter doctor
[!] Flutter (Channel main, 3.25.0-1.0.pre.78, on macOS 14.6.1 23G93 darwin-arm64, locale ja-JP)
! Unknown upstream repository.
Reinstall Flutter by following instructions at https://flutter.dev/setup.
[✗] Android toolchain - develop for Android devices
✗ Unable to locate Android SDK.
Install Android Studio from: https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.dev/to/macos-android-setup for detailed instructions).
If the Android SDK has been installed to a custom location, please use
`flutter config --android-sdk` to update to that location.
[✓] Xcode - develop for iOS and macOS (Xcode 16.0)
[✓] Chrome - develop for the web
[!] Android Studio (not installed)
[✓] Connected device (3 available)
! Error: Browsing on the local area network for iPhone15. Ensure the device is unlocked and attached with a cable or associated with the same local area network
as this Mac.
The device must be opted into Developer Mode to connect wirelessly. (code -27)
[✓] Network resources
! Doctor found issues in 3 categories.