Kategorie: iOS Development

NUR beim Ausführen der nativen App kommt es zu dem Fehler. Während der Entwicklung fällt der Fehler nicht auf.

Nachvollziehen kann man den Fehler, bevor man einen Releasbuild in der Expo-Cloud macht, auch schon durch einen lokalen Build. So spart man sich Zeit und vorallem Buildkontingent im Free-Plan von Expo.

Dafür macht man den Prebuild, startet das Projekt (.workspace-Datei !) in XCode und führt es am besten im Simulator aus. Dabei kommt es zu folgendem Fehler:

ERROR TypeError: Cannot read property 'dropGestureHandler' of nullCode-Sprache: JavaScript (javascript)

Der Stack in dem Fall dazu war:

This error is located at:
in PanGestureHandler (created by PanGestureHandler)
in PanGestureHandler (created by Card)
in RCTView (created by View)
in View
in Unknown (created by Card)
in RCTView (created by View)
in View (created by Card)
in Card (created by CardContainer)
in CardContainer (created by CardStack)
in RNSScreen
in Unknown (created by InnerScreen)
in Suspender (created by Freeze)
in Suspense (created by Freeze)
in Freeze (created by DelayedFreeze)
in DelayedFreeze (created by InnerScreen)
in InnerScreen (created by Screen)
in Screen (created by MaybeScreen)
in MaybeScreen (created by CardStack)
in RNSScreenContainer (created by ScreenContainer)
in ScreenContainer (created by MaybeScreenContainer)
in MaybeScreenContainer (created by CardStack)
in RCTView (created by View)
in View (created by Background)
in Background (created by CardStack)
in CardStack (created by HeaderShownContext)
in RNCSafeAreaProvider (created by SafeAreaProvider)
in SafeAreaProvider (created by SafeAreaInsetsContext)
in SafeAreaProviderCompat (created by StackView)
in RCTView (created by View)
in View (created by GestureHandlerRootView)
in GestureHandlerRootView (created by StackView)
in StackView (created by StackNavigator)
in PreventRemoveProvider (created by NavigationContent)
in NavigationContent
in Unknown (created by StackNavigator)
in StackNavigator (created by AppNavigator)
in EnsureSingleNavigator
in BaseNavigationContainer
in ThemeProvider
in NavigationContainerInner (created by AppNavigator)
in RCTView (created by View)
in View (created by AppNavigator)
in AppNavigator (created by Connect(AppNavigator))
in Connect(AppNavigator) (created by App)
in Provider (created by App)
in App (created by withDevTools(App))
in withDevTools(App)
in RCTView (created by View)
in View (created by AppContainer)
in RCTView (created by View)
in View (created by AppContainer)
in AppContainer
in main(RootComponent), js engine: hermes

Das Problem ist, dass die Expo-Mitinstallierte Version des Packages sich offensichtlich von der offiziellen Version unterscheidet. In dem Fall ist die Bibliothek React Navigation auch von dem Package abhängig und kommt mit der Expo-Version nicht klar.

LÖSUNG:

Unter node_modules den Ordner react-native-gesture-handler löschen und mit bspw. Yarn als Dependency hinzufügen:

yarn add react-native-gesture-handler