[iOS] A scroll view above the main list stops `minimizeBehavior="onScrollDown"`.

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@oleksandrzavarzin-callstack 已经在做这个了。

开始于 2026年11月3日。

  • #618 来自 @oleksandrzavarzin-callstack —— 未关闭

评估

难度
4/5
预计耗时
3-5 天
新手友好度
18/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
停滞
技术栈
ios, react-native, typescript
领域
mobile

调研方向

The bug is in how the native iOS tab bar picks its minimize-on-scroll scroll view when a horizontal ScrollView sits above a vertical one, so start with the minimizeBehavior prop on Tab.Navigator and the native iOS scroll-view handling it reaches. Reproduce with the sample using SHOW_HORIZONTAL_LIST true and false, and check that a finger scroll minimizes the bar only when the horizontal list is removed. Pull request #618 is already open against this issue, so review it before starting any separate fix.

由索引模型根据 Issue 内容生成。

描述

bug
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

Some tabs have a second scroll view before the main list. On iOS 26 and later, scrolling down in such a tab does not minimize the tab bar. An example is a short horizontal list of chips above a vertical list. The main list scrolls, but the tab bar stays full size.

UIKit picks the scroll view that drives minimizing from the first subview of each view, repeated down the tree. In this layout, the first scroll view on that path is the horizontal list, so vertical scrolling of the main list has no effect.

Library version

1.5.0

Environment info
System:
  OS: macOS 27.0.1
  Shell: 5.9 - /bin/zsh
Binaries:
  Node: 24.20.0
  Yarn: 1.22.22
  npm: 11.19.0
  Watchman: 2026.07.27.00
Managers:
  CocoaPods: 1.17.0
SDKs:
  iOS SDK:
    Platforms: DriverKit 27.0, iOS 27.1, macOS 27.0, tvOS 27.0, visionOS 27.0, watchOS 27.0
IDEs:
  Xcode: 27.1/27A9275
npmPackages:
  expo: 58.0.16
  react: 19.3.0
  react-native: 0.88.0
  react-native-bottom-tabs: 1.5.0
  "@bottom-tabs/react-navigation": 1.5.0
  "@react-navigation/native": 7.5.1
  "@react-navigation/native-stack": 7.21.0
  react-native-screens: 4.30.0
  react-native-safe-area-context: 5.10.1
  "@shopify/flash-list": 2.3.2
iOS:
  hermesEnabled: true
  newArchEnabled: true
Device:
  iPhone 17 Pro simulator, iOS 26.5
Steps to reproduce
  1. Create a tab navigator with minimizeBehavior="onScrollDown".
  2. In the first tab, render a horizontal ScrollView and, below it, a vertical ScrollView, FlatList, or FlashList.
  3. Scroll down in the vertical list with a finger. A scroll from code (scrollTo) never minimizes the bar.
function HomeScreen() {
  return (
    <View style={{ flex: 1 }}>
      <ScrollView horizontal style={{ flexGrow: 0 }}>
        {/* chips */}
      </ScrollView>
      <ScrollView contentInsetAdjustmentBehavior="automatic">
        {/* long content */}
      </ScrollView>
    </View>
  );
}

If you remove the horizontal list, the tab bar minimizes.

Without the horizontal list: the tab bar minimizes With the horizontal list: the tab bar stays full size
https://github.com/user-attachments/assets/c7af0c77-bf7d-45c2-9a3f-5c340e7ad507 https://github.com/user-attachments/assets/2f84e03b-3f2c-40d8-a046-37736c012055
Reproducible sample code
import { NavigationContainer } from '@react-navigation/native';
import { createNativeBottomTabNavigator } from '@bottom-tabs/react-navigation';
import { ScrollView, Text, View } from 'react-native';

const SHOW_HORIZONTAL_LIST = true;

const Tab = createNativeBottomTabNavigator();

function HomeScreen() {
  return (
    <View style={{ flex: 1 }}>
      {SHOW_HORIZONTAL_LIST && (
        <ScrollView horizontal style={{ flexGrow: 0, marginTop: 60 }}>
          {Array.from({ length: 12 }, (_, i) => (
            <Text key={i} style={{ padding: 16 }}>
              Chip {i + 1}
            </Text>
          ))}
        </ScrollView>
      )}
      <ScrollView contentInsetAdjustmentBehavior="automatic">
        {Array.from({ length: 50 }, (_, i) => (
          <Text key={i} style={{ padding: 20 }}>
            Item {i + 1}
          </Text>
        ))}
      </ScrollView>
    </View>
  );
}

function ProfileScreen() {
  return <View style={{ flex: 1 }} />;
}

export default function App() {
  return (
    <NavigationContainer>
      <Tab.Navigator minimizeBehavior="onScrollDown">
        <Tab.Screen
          name="Home"
          component={HomeScreen}
          options={{ tabBarIcon: () => ({ sfSymbol: 'house.fill' }) }}
        />
        <Tab.Screen
          name="Profile"
          component={ProfileScreen}
          options={{ tabBarIcon: () => ({ sfSymbol: 'person.fill' }) }}
        />
      </Tab.Navigator>
    </NavigationContainer>
  );
}
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  3. Fork 仓库，在一个分支上完成修改。
  4. 提交 Pull Request，并在描述里引用这个 Issue 编号。

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