Flatlist onMomentumScrollEnd called inconsistently between Android and iOS
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Description
Description
it seems the behavior isn't consistent between android and ios.
on android it works when you flick and release, it also works when you scroll and hold thereby controlling the scrolling.
on IOS it only works when you flick and let the scroll momentum end by itself.
https://reactnative.dev/docs/scrollview#onmomentumscrollend
Called when the momentum scroll ends (scroll which occurs as the ScrollView glides to a stop).
in this case, i believe it means the behavior is incorrect on Android because it's called when it glides to a stop and when the user controls the stop.
or since there's no specific event for when both the scroll and glide are ended by the user controlling it, we should fix the behavior on iOS to behave the same on Android and update the docs to Called when the momentum scroll ends (scroll which occurs as the ScrollView stops).
Steps to reproduce
- android: flick and release -> momentum end event called
- android: scroll and hold at one position then release -> momentum end event called
- ios: flick and release -> momentum end event called
- ios: scroll via scrollbar, hold then release -> momentum end event is called
- ios: flick and release via scrollbar -> momentum end event is called
- ios: scroll, hold at one position then release -> momentum end event is not called
React Native Version
0.76.5
Same behavior on both the new and old architecture
Affected Platforms
Runtime - Android, Runtime - iOS
Output of npx react-native info
expo-env-info 1.2.1 environment info:
System:
OS: macOS 14.3.1
Shell: 5.9 - /bin/zsh
Binaries:
Node: 20.18.0 - ~/.nvm/versions/node/v20.18.0/bin/node
Yarn: 1.22.22 - ~/.nvm/versions/node/v20.18.0/bin/yarn
npm: 10.8.2 - ~/.nvm/versions/node/v20.18.0/bin/npm
Managers:
CocoaPods: 1.16.2 - /opt/homebrew/bin/pod
SDKs:
iOS SDK:
Platforms: DriverKit 23.2, iOS 17.2, macOS 14.2, tvOS 17.2, visionOS 1.0, watchOS 10.2
IDEs:
Android Studio: 2022.3 AI-223.8836.35.2231.11090377
Xcode: 15.2/15C500b - /usr/bin/xcodebuild
npmPackages:
expo: ~52.0.23 => 52.0.23
expo-router: ~4.0.15 => 4.0.15
react: 18.3.1 => 18.3.1
react-dom: 18.3.1 => 18.3.1
react-native: 0.76.5 => 0.76.5
react-native-web: ~0.19.13 => 0.19.13
npmGlobalPackages:
eas-cli: 13.4.2
Expo Workflow: managed
Stacktrace or Logs
no errors, just inconsistent behavior
Reproducer
https://snack.expo.dev/@hichemfa/onmomentumscrollend-example
Screenshots and Videos
Android:
https://github.com/user-attachments/assets/706f34b0-c19c-49c2-887c-d035d2119fee
iOS:
https://github.com/user-attachments/assets/9a0cafe0-7370-4359-bd63-4dcc16cb9a51
Guide de contribution
Ouvrir le guide de contribution
Par où commencer
- Lisez l'issue en entier, puis le guide de contribution du projet.
- Signalez en commentaire que vous la prenez — cela évite que deux personnes fassent le même travail.
- Forkez le dépôt et travaillez sur une branche.
- Ouvrez une pull request qui référence le numéro de l'issue.
Piste de recherche
Commencez par le reproducteur Snack lié et la documentation de ScrollView et onMomentumScrollEnd, puis comparez les six étapes de reproduction sur Android et iOS. Déterminez quel comportement de la plateforme est attendu et vérifiez le résultat avec les architectures nouvelle et ancienne. Le travail est terminé lorsque le comportement de l’événement est cohérent avec la sémantique convenue et que la documentation le décrit correctement.
Rédigé par le modèle d'indexation à partir du texte de l'issue.
Évaluation
- Stack technique
- android, ios, react-native
- Domaine
- mobile
- Type d'issue
- Bug
- Difficulté
- 4/5
- Temps estimé
- 3-5 jours
- Activité
- Calme
- Clarté
- Plutôt claire
- Accessibilité débutants
- 48/100