tabBarMinimizeBehavior: 'onScrollDown' not working on iOS 26+ with nested Stack Navigator

先从复现文件 src/navigation/TabStack.tsx、src/navigation/HomeStack.tsx 和 src/screens/HomeScreen.tsx 开始，然后在 iOS 26+ 模拟器上运行示例。将嵌套 navigator 的设置与报告中的直接屏幕行为进行比较，并追踪 ScrollView 如何连接到底部 tab 控制器。通过嵌套屏幕向下滚动时，tab 栏会最小化，即表示完成。

Before submitting a new issue

• I tested using the latest version of the library, as the bug might be already fixed.
• I tested using a supported version of react native.
• I checked for possible duplicate issues, with possible answers.

Bug summary

Description

The tabBarMinimizeBehavior: 'onScrollDown' option is not working when using createNativeBottomTabNavigator with nested NativeStackNavigator screens on iOS 26+.

Environment

• React Native version: 0.82.1
• @react-navigation/bottom-tabs version: 7.9.0
• react-native-screens version: 4.18.0
• iOS version: 26.0+
• Platform: iOS (iPhone)

Steps to Reproduce

1. Create a NativeBottomTabNavigator with tabBarMinimizeBehavior: 'onScrollDown' and tabBarControllerMode: 'tabSidebar'
2. Use nested NativeStackNavigator as screen components (e.g., HomeStack containing HomeScreen)
3. Inside the nested screen, use a ScrollView with contentInsetAdjustmentBehavior="automatic"
4. Scroll down in the ScrollView
5. Tab bar does not minimize

Expected Behavior

When scrolling down, the tab bar should minimize (collapse to show only the active tab on the left side) as per iOS 26's native behavior.

Actual Behavior

The tab bar remains fully visible and does not minimize when scrolling down.

Code Example

// TabStack.tsx
const NativeTab = createNativeBottomTabNavigator();

export const TabStack = () => {
const [isIOS26Plus, setIsIOS26Plus] = useState(false);

useEffect(() => {
if (Platform.OS === 'ios') {
const iosVersion = parseFloat(DeviceInfo.getSystemVersion());
setIsIOS26Plus(iosVersion >= 26.0);
}
}, []);

return (
<NativeTab.Navigator
screenOptions={() => ({
lazy: false,
headerShown: false,
...(isIOS26Plus && {
tabBarMinimizeBehavior: 'onScrollDown',
tabBarControllerMode: 'tabSidebar',
}),
})}
>
<NativeTab.Screen
component={HomeStack} // Nested NativeStackNavigator
name="HomeStack"
options={{
tabBarIcon: {
type: 'sfSymbol',
name: 'house.fill',
},
tabBarLabel: 'Home',
}}
/>
</NativeTab.Navigator>
);
};
// HomeStack.tsx
const Stack = createNativeStackNavigator();

export const HomeStack = () => {
return (
<Stack.Navigator screenOptions={{ headerShown: false }}>
<Stack.Screen name="HomeScreen" component={HomeScreen} />
</Stack.Navigator>
);
};
// HomeView.tsx (inside HomeScreen)
<ScrollView
contentInsetAdjustmentBehavior="automatic"
scrollEventThrottle={16}
// ... other props

{/* Scrollable content */}
### Additional Context

• The issue occurs specifically with nested navigators (NativeTab → NativeStack → Screen)
• Works correctly when using direct screen components without nesting
• contentInsetAdjustmentBehavior="automatic" is set on the ScrollView as per documentation
• tabBarControllerMode: 'tabSidebar' is also set
• Tested on iOS 26.0+ devices/simulators

Possible Related Issues

• The scroll detection might not be propagating correctly through nested navigators
• NativeTab might need direct access to the ScrollView to detect scroll events

Library version

7.9.0

Environment info

info Fetching system and libraries information...
System:
  OS: macOS 26.2
  CPU: (12) arm64 Apple M3 Pro
  Memory: 205.39 MB / 36.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 22.9.0
    path: /Users/emirbayir/.nvm/versions/node/v22.9.0/bin/node
  Yarn:
    version: 3.6.4
    path: /opt/homebrew/bin/yarn
  npm:
    version: 11.6.2
    path: /Users/emirbayir/.nvm/versions/node/v22.9.0/bin/npm
  Watchman:
    version: 2025.10.06.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.15.2
    path: /Users/emirbayir/.rvm/gems/ruby-3.2.0/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 25.2
      - iOS 26.2
      - macOS 26.2
      - tvOS 26.2
      - visionOS 26.2
      - watchOS 26.2
  Android SDK:
    API Levels:
      - "33"
      - "34"
      - "35"
      - "36"
    Build Tools:
      - 30.0.3
      - 33.0.0
      - 33.0.1
      - 34.0.0
      - 35.0.0
      - 36.0.0
      - 36.1.0
    System Images:
      - android-30 | Google APIs ARM 64 v8a
      - android-35 | Google Play ARM 64 v8a
      - android-35 | Pre-Release 16 KB Page Size Google Play ARM 64 v8a
      - android-36 | Google Play ARM 64 v8a
      - android-VanillaIceCream | Google Play ARM 64 v8a
    Android NDK: Not Found
IDEs:
  Android Studio: 2025.1 AI-251.26094.121.2513.14007798
  Xcode:
    version: 26.2/17C52
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.16
    path: /usr/bin/javac
  Ruby:
    version: 3.2.0
    path: /Users/emirbayir/.rvm/rubies/ruby-3.2.0/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 20.0.0
    wanted: 20.0.0
  react:
    installed: 19.1.1
    wanted: 19.1.1
  react-native:
    installed: 0.82.1
    wanted: ^0.82.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

info React Native v0.83.0 is now available (your project is running on v0.82.1).
info Changelog: https://github.com/facebook/react-native/releases/tag/v0.83.0
info Diff: https://react-native-community.github.io/upgrade-helper/?from=0.82.1&to=0.83.0
info For more info, check out "https://reactnative.dev/docs/upgrading?os=macos".

Steps to reproduce

1. …
2. …

Reproducible sample code

### Steps to Reproduce

1. **Create a new React Native project:**
 
   npx [email protected] init TestNativeTabMinimize
   cd TestNativeTabMinimize
   2. **Install required dependencies:**ash
   npm install @react-navigation/[email protected] @react-navigation/[email protected] @react-navigation/[email protected] [email protected] [email protected] [email protected]
   3. **For iOS, install pods:**
   
   cd ios && pod install && cd ..
   4. **Create the following files:**

   **App.tsx:**
   
   import React from 'react';
   import { NavigationContainer } from '@react-navigation/native';
   import { TabStack } from './src/navigation/TabStack';

   export default function App() {
     return (
       <NavigationContainer>
         <TabStack />
       </NavigationContainer>
     );
   }
      **src/navigation/TabStack.tsx:**
   import React, { useEffect, useState } from 'react';
   import { createNativeBottomTabNavigator } from '@react-navigation/bottom-tabs/unstable';
   import { Platform } from 'react-native';
   import DeviceInfo from 'react-native-device-info';
   import { HomeStack } from './HomeStack';
   import { ProfileStack } from './ProfileStack';

   const NativeTab = createNativeBottomTabNavigator();

   export const TabStack = () => {
     const [isIOS26Plus, setIsIOS26Plus] = useState(false);

     useEffect(() => {
       if (Platform.OS === 'ios') {
         const iosVersion = parseFloat(DeviceInfo.getSystemVersion());
         setIsIOS26Plus(iosVersion >= 26.0);
       }
     }, []);

     return (
       <NativeTab.Navigator
         screenOptions={() => ({
           headerShown: false,
           ...(isIOS26Plus && {
             tabBarMinimizeBehavior: 'onScrollDown',
             tabBarControllerMode: 'tabSidebar',
           }),
         })}
       >
         <NativeTab.Screen
           component={HomeStack}
           name="HomeStack"
           options={{
             tabBarIcon: {
               type: 'sfSymbol',
               name: 'house.fill',
             },
             tabBarLabel: 'Home',
           }}
         />
         <NativeTab.Screen
           component={ProfileStack}
           name="ProfileStack"
           options={{
             tabBarIcon: {
               type: 'sfSymbol',
               name: 'person.fill',
             },
             tabBarLabel: 'Profile',
           }}
         />
       </NativeTab.Navigator>
     );
   };
      **src/navigation/HomeStack.tsx:**
   
   import React from 'react';
   import { createNativeStackNavigator } from '@react-navigation/native-stack';
   import { HomeScreen } from '../screens/HomeScreen';

   const Stack = createNativeStackNavigator();

   export const HomeStack = () => {
     return (
       <Stack.Navigator screenOptions={{ headerShown: false }}>
         <Stack.Screen name="HomeScreen" component={HomeScreen} />
       </Stack.Navigator>
     );
   };
      **src/navigation/ProfileStack.tsx:**
   
   import React from 'react';
   import { createNativeStackNavigator } from '@react-navigation/native-stack';
   import { ProfileScreen } from '../screens/ProfileScreen';

   const Stack = createNativeStackNavigator();

   export const ProfileStack = () => {
     return (
       <Stack.Navigator screenOptions={{ headerShown: false }}>
         <Stack.Screen name="ProfileScreen" component={ProfileScreen} />
       </Stack.Navigator>
     );
   };
      **src/screens/HomeScreen.tsx:**sx
   import React from 'react';
   import { View, ScrollView, Text, StyleSheet, Platform } from 'react-native';
   import DeviceInfo from 'react-native-device-info';

   export const HomeScreen = () => {
     const isIOS26Plus = Platform.OS === 'ios' && parseFloat(DeviceInfo.getSystemVersion()) >= 26.0;

     return (
       <View style={styles.container}>
         <ScrollView
           contentInsetAdjustmentBehavior={isIOS26Plus ? 'automatic' : undefined}
           style={styles.scrollView}
           contentContainerStyle={styles.contentContainer}
         >
           {Array.from({ length: 50 }, (_, i) => (
             <View key={i} style={styles.item}>
               <Text style={styles.text}>Item {i + 1}</Text>
             </View>
           ))}
         </ScrollView>
       </View>
     );
   };

   const styles = StyleSheet.create({
     container: {
       flex: 1,
       backgroundColor: '#fff',
     },
     scrollView: {
       flex: 1,
     },
     contentContainer: {
       padding: 20,
       paddingBottom: 100,
     },
     item: {
       padding: 20,
       marginBottom: 10,
       backgroundColor: '#f0f0f0',
       borderRadius: 8,
     },
     text: {
       fontSize: 16,
     },
   });
      **src/screens/ProfileScreen.tsx:**
   import React from 'react';
   import { View, Text, StyleSheet } from 'react-native';

   export const ProfileScreen = () => {
     return (
       <View style={styles.container}>
         <Text style={styles.text}>Profile Screen</Text>
       </View>
     );
   };

   const styles = StyleSheet.create({
     container: {
       flex: 1,
       justifyContent: 'center',
       alignItems: 'center',
       backgroundColor: '#fff',
     },
     text: {
       fontSize: 24,
     },
   });
   5. **Update index.js:**
   import { AppRegistry } from 'react-native';
   import App from './App';
   import { name as appName } from './app.json';

   AppRegistry.registerComponent(appName, () => App);
   6. **Run the app:**
   # iOS
   npx react-native run-ios
   
   # Or specify iOS 26+ simulator if available
   npx react-native run-ios --simulator="iPhone 16 Pro (iOS 26.0)"
   7. **Test the behavior:**
   - Navigate to the "Home" tab
   - Scroll down in the ScrollView
   - **Expected:** Tab bar should minimize (collapse to show only active tab on left)
   - **Actual:** Tab bar remains fully visible

### Platform
- **iOS:** ✅ Issue occurs
- **Android:** ❌ Not applicable (feature is iOS 26+ only)

### Test Environment
- **Simulator:** iPhone 16 Pro (iOS 26.0) or any iOS 26+ simulator
- **Physical Device:** Any iPhone running iOS 26.0 or later
- **React Native:** 0.82.1
- **@react-navigation/bottom-tabs:** 7.9.0
- **react-native-screens:** 4.18.0

### Additional Notes
- The issue only occurs when using **nested navigators** (NativeTab → NativeStack → Screen)
- If you use direct screen components without nesting, the minimize behavior works correctly
- The `contentInsetAdjustmentBehavior="automatic"` is set on the ScrollView as per documentation requirements
- `tabBarControllerMode: 'tabSidebar'` is also configured

### Minimal Reproduction Repository
[Link to GitHub repository with minimal reproduction code - if you create one]