I'm trying to create Augmented reality app with React Native I installed #viro-community/react-viro
and when Im trying to start the app it shows me this error
this is my code :
import React, {useState} from 'react';
import { StyleSheet, View } from 'react-native';
import { ViroARScene, ViroText, ViroConstants,ViroARSceneNavigator } from '#viro-community/react-viro';
const InititalScene = () => {
return (
<ViroARScene>
<ViroText text={"Hello team"} position={[0,0,-5]} />
</ViroARScene>
)
}
export default App = () => {
return(
<ViroARSceneNavigator
initialScene={{scene:InititalScene}}
styles={{flex:1}}
/>
)
}
var styles = StyleSheet.create({
})
It should shows me the camera with the title Hello team on the camera
Related
It says I can use Expo.Apploading but I have no idea about that. If someone could help it would be great. This happens in either of device I am running. Below is code for App.js
import React, {useState}from 'react';
import {Text, View } from 'react-native';
import *as Font from 'expo-font';
import {AppLoading} from 'expo';
import {enableScreens} from 'react-native-screens';
import EstesGuideNavigator from './navigation/EstesGuideNavigator';
enableScreens(); // useScreens has been changed to enableScreens - this helps screens load faster in background
const fetchFonts = () => { //fetching costum fonts for my app using Async
Font.loadAsync({
'raleway-blackItalic' : require('./assets/fonts/Raleway-BlackItalic.ttf'),
'raleway-bold' : require('./assets/fonts/Raleway-Bold.ttf'),
'raleway-regular' : require('./assets/fonts/Raleway-Regular.ttf'),
'raleway-thin' : require('./assets/fonts/Raleway-Thin.ttf')
});
};
export default function App() {
const [fontLoaded, setFontLoaded] = useState(false); //initially it's false because app hasn't been loaded
if (!fontLoaded) {
return(
<AppLoading
startAsync = {fetchFonts}
onFinish = {() => setFontLoaded(true) }
/> //if assets(fonts here) is not loaded we display loading screen and load assets for app
);
}
return <EstesGuideNavigator/>;
}
Is there any way to resolve this?
I don't know what's wrong but this is how i handle my font loading, Works perfectly
import { AppLoading } from "expo";
import { Asset } from "expo-asset";
import * as Font from "expo-font";
import React, { useState } from "react";
import { Platform, StatusBar, StyleSheet, View } from "react-native";
import { Ionicons } from "#expo/vector-icons";
import AppNavigator from "./navigation/AppNavigator";
export default function App(props) {
const [isLoadingComplete, setLoadingComplete] = useState(false);
if (!isLoadingComplete && !props.skipLoadingScreen) {
return (
<AppLoading
startAsync={loadResourcesAsync}
onError={handleLoadingError}
onFinish={() => handleFinishLoading(setLoadingComplete)}
/>
);
} else {
return (
<View style={styles.container}>
{Platform.OS === "ios" && <StatusBar barStyle="default" />}
<AppNavigator />
</View>
);
}
}
async function loadResourcesAsync() {
await Promise.all([
Asset.loadAsync([
require("./assets/images/tick.png"),
require("./assets/images/error.png")
]),
Font.loadAsync({
// This is the font that we are using for our tab bar
...Ionicons.font,
// We include SpaceMono because we use it in HomeScreen.js. Feel free to
// remove this if you are not using it in your app
"space-mono": require("./assets/fonts/SpaceMono-Regular.ttf"),
"Gilroy-Bold": require("./assets/fonts/Gilroy-Bold.otf"),
"Gilroy-Medium": require("./assets/fonts/Gilroy-Medium.otf"),
"Gilroy-Heavy": require("./assets/fonts/Gilroy-Heavy.otf")
})
]);
}
function handleLoadingError(error) {
// In this case, you might want to report the error to your error reporting
// service, for example Sentry
console.warn(error);
}
function handleFinishLoading(setLoadingComplete) {
setLoadingComplete(true);
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: "#fff"
}
});
I am new to react native, I created a sample application for navigation between screen but I am facing some issue. I have attached the screen shot.
code I have used in App.js
import React from 'react';
import {Text, View } from 'react-native';
import { StackNavigator } from 'react-navigation';
import FirstScreen from './screens/FirstScreen'
import SecondScreen from './screens/SecondScreen'
const Navigation = StackNavigator({
First: {screen: FirstScreen},
Second: {screen: SecondScreen}
});
export default Navigation; // Export your root navigator as the root component
second screen code:
import React from 'react';
import {Text, View, Button} from 'react-native';
const util = require('util');
export default class SecondScreen extends React.Component {
static navigationOptions = {
title: 'Second screen',
};
render() {
console.log("this.props.navigation.state = " + util.inspect(this.props.navigation.state, false, null));
var {params} = this.props.navigation.state;
return (
<View>
<Text>This is screen 2</Text>
<Text>Params from screen1 : {params.name}, email = {params.email}</Text>
</View>
);
}
}
These code I got form github.
Refer below link. You have to clear cache and run again.
How to clear react-native cache?
There would be a chance for a path issue or some error in second screen code. Make a simple hello world on the second screen.
So I started learning react-native from videos and they have used ListView but as the ListView will be deprecated soon and will be removed. I get to know that FlatList will be the proper replacement but being a beginner I am not able to migrate to Flatlist.
import React, { Component } from "react";
import { ListView } from 'react-native';
import { connect } from 'react-redux';
import ListItem from './ListItem';
class LibraryList extends Component {
componentWillMount() {
const ds = new ListView.DataSource({
rowHasChanged: (r1,r2) => r1 !==r2
});
this.dataSource =ds.cloneWithRows(this.props.libraries);
}
renderRow(library) {
return <ListItem library = { library } />;
}
render() {
return(
<ListView
dataSource = {this.dataSource}
renderRow = {this.renderRow}
/>
);
}
}
const mapStateToProps = state => {
return { libraries: state.libraries };
};
export default connect(mapStateToProps) (LibraryList);
Welcome to stackoverflow.
Migrating should be pretty straightforward, you don't need a dataSource anymore. You can pass your array of items directly to the Component.
import React, { Component } from "react";
import { FlatList } from 'react-native';
import { connect } from 'react-redux';
import ListItem from './ListItem';
class LibraryList extends Component {
renderRow({item}) {
return <ListItem library = { item } />;
}
render() {
return(
<FlatList
data = {this.props.libraries}
renderItem = {this.renderRow}
/>
);
}
}
const mapStateToProps = state => {
return { libraries: state.libraries };
};
export default connect(mapStateToProps) (LibraryList);
Header over to the documentation here to find out more.
I'm building a search engine with React.js, where I can look for GIPHY gifs using their API. Everytime I type a word(any word), it always loads the same gifs and when I erase and write another word, the gifs don't update.
index.js:
import React from 'react'; //react library
import ReactDOM from 'react-dom'; //react DOM - to manipulate elements
import './index.css';
import SearchBar from './components/Search';
import GifList from './components/SelectedList';
class Root extends React.Component { //Component that will serve as the parent for the rest of the application.
constructor() {
super();
this.state = {
gifs: []
}
this.handleTermChange = this.handleTermChange.bind(this)
}
handleTermChange(term) {
console.log(term);
let url = 'http://api.giphy.com/v1/gifs/search?q=${term.replace(/\s/g, '+')}&api_key=aOfWv08Of7UqS6nBOzsO36NDvwYzO6io';
fetch(url).
then(response => response.json()).then((gifs) => {
console.log(gifs);
this.setState({
gifs: gifs
});
});
};
render() {
return (
<div>
<SearchBar onTermChange={this.handleTermChange} />
<GifList gifs={this.state.gifs} />
</div>
);
}
}
ReactDOM.render( <Root />, document.getElementById('root'));
search.js
import React, { PropTypes } from 'react'
import './Search.css'
class SearchBar extends React.Component {
onInputChange(term) {
this.props.onTermChange(term);
}
render() {
return (
<div className="search">
<input placeholder="Enter text to search for gifs!" onChange={event => this.onInputChange(event.target.value)} />
</div>
);
}
}
export default SearchBar;
Giflist:
import React from 'react';
import GifItem from './SelectedListItem';
const GifList = (props) => {
console.log(props.gifs);
const gifItems = props.gifs && props.gifs.data && props.gifs.data.map((image) => {
return <GifItem key={image.id} gif={image} />
});
return (
<div className="gif-list">{gifItems}</div>
);
};
export default GifList;
GifItem:
import React from 'react';
const GifItem = (image) => {
return (
<div className="gif-item">
<img src={image.gif.images.downsized.url} />
</div>
)
};
export default GifItem;
I can't seem to find where is the issue here. Is it because of this.handleTermChange = this.handleTermChange.bind(this) and there is no "update" state after?
Any help is welcome :) Thanks!
Its because, you are not putting the term value entered by user in the url, all the time you hit the api with static value term, here:
'http://api.giphy.com/v1/gifs/search?q=${term.replace(/\s/g, '+')}&api_key=aOfWv08Of7UqS6nBOzsO36NDvwYzO6io';
Replace ' by ' (tick), like this:
let url = `http://api.giphy.com/v1/gifs/search?q=${term.replace(/\s/g, '+')}&api_key=aOfWv08Of7UqS6nBOzsO36NDvwYzO6io`;
Check MDN Doc for more details about Template Literals.
I'm writing a React-Native application in which I have a screen I need to test:
MyScreen.js
import React, { Component } from "react";
import CustomTable from "./CustomTable";
export default MyScreen extends Component {
render() {
return <CustomTable />;
}
}
CustomTable.ios.js
import React, { Component } from "react";
import { View } from "react-native";
import TableView from "react-native-tableview";
export default MyScreen extends Component {
render() {
return (
<View>
...some stuff
<TableView />
</View>
);
}
}
react-native-tableview calls some iOS specific code so I have mocked it out by simply returning the android version (CustomTable.android.js) in the __mocks__ folder
__mocks__/CustomTable.ios.js
import CustomAndroidTable from "../CustomTable.android";
export const CustomTable = CustomAndroidTable;
What I want to do is test MyScreen.js with Jest, but I want it to use the __mock__/CustomTable.ios. How do I go about getting it to do that? Is that even possible with Jest? My current test file looks like:
tests/MyScreen.test.js
import React from "react";
import renderer from "react-test-renderer";
import MyScreen from "../src/MyScreen";
describe("test", () => {
it("works", () => {
jest.mock("../src/CustomTable.ios");
const tree = renderer.create(
<MyScreen />,
).toJSON();
expect(tree).toMatchSnapshot();
});
But it still calls the original version of CustomTable.ios. What am i doing wrong?
You should call jest.mock outside of your suite test. It should be immediately after your imports.
import React from "react";
import renderer from "react-test-renderer";
import MyScreen from "../src/MyScreen";
jest.mock("../src/CustomTable.ios");
describe("test", () => {
it("works", () => {
const tree = renderer.create(
<MyScreen />,
).toJSON();
expect(tree).toMatchSnapshot();
});