react-native – w3toppers.com

Invariant Violation: requireNativeComponent: “RNSScreen” was not found in the UIManager

Faced the same issue while implementing Navigation. Run following commands npm install @react-navigation/native React Navigation is made up of some core utilities and those are then used by navigators to create the navigation structure in your app.  In your project directory, run: npm install react-native-reanimated react-native-gesture-handler react-native-screens react-native-safe-area-context @react-native-community/masked-view This will install versions of these … Read more

FlatList calls `onEndReached` when it’s rendered

Try to implement onMomentumScrollBegin on FlatList : constructor(props) { super(props); this.onEndReachedCalledDuringMomentum = true; } … <FlatList … onEndReached={this.onEndReached.bind(this)} onEndReachedThreshold={0.5} onMomentumScrollBegin={() => { this.onEndReachedCalledDuringMomentum = false; }} /> and modify your onEndReached onEndReached = ({ distanceFromEnd }) => { if(!this.onEndReachedCalledDuringMomentum){ this.fetchData(); this.onEndReachedCalledDuringMomentum = true; } }

Does react native support base64 encoded images?

I think Ramsay is wrong, react native have a fully support on base64 image. I found this https://facebook.github.io/react-native/docs/tabbarios.html this is a official example of how to create a iOS TabBarController, and they use a base64 image as one of the TabBar’s icon. I think you did not specify the width and the height in the … Read more

Renaming a React Native project?

You can change the name attribute in package.json, run react-native upgrade, and just let react overwrite the android/ios files. Don’t overwrite your index files if there is unsaved code, however. Then change your Appregistry line from AppRegistry.registerComponent(‘MyAppIOS’, () => MyAppIOS); To: AppRegistry.registerComponent(‘MyApp’, () => MyApp);

StackNavigator through Component gives undefined error

Since your Test component does not belong to navigation stack it doesn’t have the navigation prop. You can do couple of things. Simple one is to pass the navigation to the child component like the example below. return ( <View> <Text>Hello, Chat App!</Text> <Button onPress={() => navigate(‘Chat’, { user: userName })} title={“Chat with ” + … Read more

How to make Metro (React Native packager) ignore certain directories

The configuration for this has a habit of changing between RN versions. See below for version-specific instructions on creating a config file, loading the config file and clearing the cache. For React Native >= 0.64(?) This is speculative as 0.64 is not yet released, but a rename from blacklist to exclusionList made in metro 0.60 … Read more

How to remove ‘Warning: Async Storage has been extracted from react-native core…’?

There are two ways you can do this. Firstly import AsyncStorage correctly. This will remove the warning and fix the problem. Secondly, suppress the warning. This will just hide the warning but will cause you issues once AsyncStorage has been removed from react-native. I would not do this as the first way actually solves the … Read more

FlatList inside ScrollView doesn’t scroll

We can use the built-in nestedscrollenabled prop for the children FlatList/ScrollView components. <FlatList nestedScrollEnabled /> This is only required for Android (Nested scrolling is supported by default on iOS).

ES6, how can you export an imported module in a single line?

export {default as Module} from ‘./Module/Module’; is the standard ES6 way, as long as you don’t need Module to also be available inside the module doing the exporting. export Module from ‘./Module/Module’; is a proposed ESnext way to do it, but that only works if you’ve enabled it in Babel for now.