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Summary: Reopen in reference to https://github.com/facebook/react-native/issues/42435 , as it had a lot of commits and fixes making it messed up. Weirdly when using a [Section List](https://reactnative.dev/docs/sectionlist) specifically when using the [SectionSeperatorComponent](https://reactnative.dev/docs/sectionlist#sectionseparatorcomponent), and adding additional Data on the renderItem List, there is a unmount occurring as the new Data is added, this only happens while using the `SectionSeparatorComponent` and limited to the same **Here is the Current Behaviour** https://github.com/facebook/react-native/assets/72331432/0622e789-ddbc-4038-8ccc-a421050eecbf **Here is the Expected Behaviour After Fixes** https://github.com/facebook/react-native/assets/72331432/2f0cc3a9-da97-43f5-8a4b-3faca74ae834 The issues is happening because the Parent View gets removed, as we add Data, the separator moves causing the unmount, the solution that i proposed here is to conditionally render to make sure that our separator renders correctly which required to add an empty view as the `itemSeparatorComponent`. ## Changelog: [General] [Added] - Fixes SectionList Unmounting issue with separatorComponent on data addition and removal. Pull Request resolved: https://github.com/facebook/react-native/pull/43223 Test Plan: i used the `rn-tester` App to test out the changes below is the code to test the same. Update the snapshots to align with the changes. ``` import React, {useEffect, useState} from 'react'; import { StyleSheet, Text, View, SafeAreaView, StatusBar, SectionList, Image, } from 'react-native'; interface Item { id: string; title: string; imgSrc: string; } interface Section { title: string; data: Item[]; } const keyExtractor = (item: Item, index: number) => `${item.title}-${index}`; const renderItem = ({item, index}: {item: Item; index: number}) => { return <ItemComponent item={item} index={index} />; }; const additionalFruits = [ { id: '7', title: 'Sandwich', imgSrc: 'https://img.freepik.com/premium-vector/sanwich-vector-isolated-fast-food_484148-2.jpg', }, { id: '8', title: 'Burger', imgSrc: 'https://static.vecteezy.com/system/resources/thumbnails/033/494/666/original/animated-illustration-of-burger-cartoon-for-foods-menu-animation-free-video.jpg', }, { id: '9', title: 'Juice', imgSrc: 'https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQHg9yLXE7Jlq4OM9ey64TW4D9qUFaeGU76rg&usqp=CAU', }, { id: '10', title: 'Milkshake', imgSrc: 'https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcROpBez3eZKvEVdxBce9XyG6j6caDFMjV_xUQ&usqp=CAU', }, ]; const DATA: Section[] = [ { title: 'Items', data: [ { id: '1', title: 'Cake', imgSrc: 'https://static.vecteezy.com/system/resources/previews/012/132/227/original/cute-cake-cartoon-icon-illustration-food-recreation-icon-concept-isolated-premium-flat-cartoon-style-vector.jpg', }, { id: '2', title: 'Pizza', imgSrc: 'https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcR2kYjlsayzKZx4hFo6fbH7S8pde2JRo2a0hfaeoz3O7bjqdJjhI0tFiSROM8G4UbdbwXU&usqp=CAU', }, { id: '3', title: 'Coke', imgSrc: 'https://png.pngtree.com/png-clipart/20220116/original/pngtree-cartoon-hand-painted-coke-bottle-png-image_7106844.png', }, { id: '4', title: 'Noodles', imgSrc: 'https://thumbs.dreamstime.com/z/cute-cartoon-vector-bowl-noodle-isolated-white-background-115120959.jpg', }, { id: '5', title: 'Pasta', imgSrc: 'https://t4.ftcdn.net/jpg/02/65/00/69/360_F_265006936_2dlz2VtcqZZUbco1VnDpU2diyd8OagFS.jpg', }, { id: '6', title: 'Fries', imgSrc: 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}, ], }, ]; const ItemComponent = ({item, index}: {item: Item; index: number}) => { useEffect(() => { console.log('Mount of', index, item.title); return () => { console.log('Unmount of', index, item.title); }; }, []); return ( <View style={styles.card}> <Text style={styles.cardText}>{item.title}</Text> <Image source={{uri: item.imgSrc}} style={styles.imageStyles} /> </View> ); }; const App = () => { const [data, setData] = useState(DATA); const fetchNextPage = () => { const newInnerData = [...data[0].data, ...additionalFruits]; setData([{...data[0], data: newInnerData}]); }; return ( <SafeAreaView style={styles.container}> <View style={styles.scrollView}> <SectionList keyExtractor={keyExtractor} onEndReachedThreshold={0.5} onEndReached={fetchNextPage} sections={data} renderItem={renderItem} ItemSeparatorComponent={() => <View style={{height: 16}} />} renderSectionHeader={({section}) => ( <Text style={styles.sectionHeaderText}>{section.title}</Text> )} /> </View> </SafeAreaView> ); }; const styles = StyleSheet.create({ container: { flex: 1, backgroundColor: '#F5F5F5', paddingTop: StatusBar.currentHeight, }, scrollView: { paddingHorizontal: 16, }, card: { backgroundColor: '#FFFFFF', flexDirection: 'row', alignItems: 'center', justifyContent: 'center', gap: 8, height: 200, padding: 16, borderRadius: 8, marginBottom: 16, borderWidth: 1, }, cardText: { fontSize: 30, }, headerText: { fontSize: 24, textAlign: 'center', marginBottom: 12, }, footerText: { fontSize: 24, textAlign: 'center', marginTop: 12, }, sectionHeaderText: { backgroundColor: '#FFFFFF', fontSize: 24, fontWeight: 'bold', }, imageStyles: { height: '100%', width: 100, }, }); export default App; ``` Reviewed By: yungsters Differential Revision: D54301991 Pulled By: javache fbshipit-source-id: d2cfafb1b4eb868761d849111b5abb7e9d584a46
React Native
Learn once, write anywhere:
Build mobile apps with React.
Getting Started · Learn the Basics · Showcase · Contribute · Community · Support
React Native brings React's declarative UI framework to iOS and Android. With React Native, you use native UI controls and have full access to the native platform.
- Declarative. React makes it painless to create interactive UIs. Declarative views make your code more predictable and easier to debug.
- Component-Based. Build encapsulated components that manage their state, then compose them to make complex UIs.
- Developer Velocity. See local changes in seconds. Changes to JavaScript code can be live reloaded without rebuilding the native app.
- Portability. Reuse code across iOS, Android, and other platforms.
React Native is developed and supported by many companies and individual core contributors. Find out more in our ecosystem overview.
Contents
- Requirements
- Building your first React Native app
- Documentation
- Upgrading
- How to Contribute
- Code of Conduct
- License
📋 Requirements
React Native apps may target iOS 13.4 and Android 6.0 (API 23) or newer. You may use Windows, macOS, or Linux as your development operating system, though building and running iOS apps is limited to macOS. Tools like Expo can be used to work around this.
🎉 Building your first React Native app
Follow the Getting Started guide. The recommended way to install React Native depends on your project. Here you can find short guides for the most common scenarios:
📖 Documentation
The full documentation for React Native can be found on our website.
The React Native documentation discusses components, APIs, and topics that are specific to React Native. For further documentation on the React API that is shared between React Native and React DOM, refer to the React documentation.
The source for the React Native documentation and website is hosted on a separate repo, @facebook/react-native-website.
🚀 Upgrading
Upgrading to new versions of React Native may give you access to more APIs, views, developer tools, and other goodies. See the Upgrading Guide for instructions.
React Native releases are discussed in this discussion repo.
👏 How to Contribute
The main purpose of this repository is to continue evolving React Native core. We want to make contributing to this project as easy and transparent as possible, and we are grateful to the community for contributing bug fixes and improvements. Read below to learn how you can take part in improving React Native.
Code of Conduct
Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please read the full text so that you can understand what actions will and will not be tolerated.
Contributing Guide
Read our Contributing Guide to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes to React Native.
Open Source Roadmap
You can learn more about our vision for React Native in the Roadmap.
Good First Issues
We have a list of good first issues that contain bugs which have a relatively limited scope. This is a great place to get started, gain experience, and get familiar with our contribution process.
Discussions
Larger discussions and proposals are discussed in @react-native-community/discussions-and-proposals.
📄 License
React Native is MIT licensed, as found in the LICENSE file.
React Native documentation is Creative Commons licensed, as found in the LICENSE-docs file.