I'm trying to include some icons from react-native-vector-icons in my project. Oftentimes I'm aligning the icon with e.g. an input so I want it to be the same height (or at least smaller) so I can center it in front of the input in a flex row without increasing the size of the row. However, the icons come out too small if I set their size to the font size of the input. If I increase the size of the icon, this stretches my flex box, but this is clearly unnecessary because the icon has a lot of whitespace at the top and bottom. Here's a sample screenshot:
Is there any way to trim this? The icon should be square. Here's the code that I currently have on that screen:
import React, {Component} from 'react';
import {View} from 'react-native';
import Ionicons from 'react-native-vector-icons/Ionicons';
export default class App extends Component {
render() {
return (
<View style={{flex: 1, justifyContent: 'center', alignItems: 'center', backgroundColor: 'white'}}>
<Ionicons name='ios-checkmark' size={30} />
</View>
);
}
}
Related
i am new to react i m trying to make the background color of my main container cover all the screen but when i use flex 1 everything seems to disappear i've seen many people doing it and it turned fine i can't understand the problem since i m using it on my container .
import React from 'react';
import mainstyles from '../styles/mainstyles';
import {
Button,
Text,
View,
AlertButton,
TouchableOpacity,
} from 'react-native';
const UploadFile = ()=>{
return (
<View style={mainstyles.container}>
<Text style={mainstyles.title}>Ocr Scan</Text>
<Text style={mainstyles.par}>Import a file and start digitizing</Text>
<Button
title="Take picture"
/>
<Button
title="Upload file"
/>
</View>
);
};
export default UploadFile;
import {StyleSheet} from 'react-native'
const mainstyles=StyleSheet.create({
container:{
flex:1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: 'black',
},
When you use flex on a component A, every component B that nest component A need to use flex.
Could you suggest a starting point or reference library to have a carousel/intro-slider where the effect is not of slide but of overriding. For example, if you check this image it is quite close, but upon slide previous image slide left too. What I want is an overriding kind of impact such that only the new layer slides and covers the one if scrolled over 50% else slides back.
I recommend react-native-viewpager for you.
Installing
yarn add #react-native-community/viewpager
Usage
import React from 'react';
import {StyleSheet, View, Text} from 'react-native';
import ViewPager from '#react-native-community/viewpager';
const MyPager = () => {
return (
<ViewPager style={styles.viewPager} initialPage={0}>
<View key="1">
<Text>First page</Text>
</View>
<View key="2">
<Text>Second page</Text>
</View>
</ViewPager>
);
};
const styles = StyleSheet.create({
viewPager: {
flex: 1,
},
});
I am trying to randomly display images from a local file that have been stored in an array in a Card component which is then rendered in the App, the root of the application.
Here is the Images file containing an array of images in the same directory.
const woolyImages = [
require('images/wooly1'),
require('images/wooly2'),
require('images/wooly3'),
require('images/wooly4'),
require('images/wooly5'),
];
export default woolyImages;
Here is the Card component where I attempt to pick a random image from the array and display it using the Image component via 'source'.
import React from 'react';
import {Image, View, StyleSheet} from 'react-native';
import woolyImages from '../images/Images';
function Card() {
const randomImage =
woolyImages[Math.floor(Math.random() * woolyImages.length)];
console.log(randomImage);
return (
<View style={styles.cardContainer}>
<Image source={randomImage} />
</View>
);
}
const styles = StyleSheet.create({
cardContainer: {
width: '50%',
height: '35%',
backgroundColor: 'pink',
},
});
export default Card;
(I inserted the pink background so I could be sure it was rendering in the view. It is.)
Finally, here is the root of the application where I render the card.
import React from 'react';
import {View, StyleSheet} from 'react-native';
import Header from './components/Header';
import Card from './components/Card';
import GenerateWoolyButton from './components/GenerateWoolyButton';
function App() {
return (
<View style={styles.container}>
<Header />
<Card />
<GenerateWoolyButton style={styles.button} />
</View>
);
}
const styles = StyleSheet.create({
container: {
justifyContent: 'flex-start',
alignItems: 'center',
flex: 1,
},
});
export default App;
I am getting the below error.
Can anyone please tell me how to display a randomly generated picture in the Card component and display it in the root of my application? Thank you.
You need to add width & height styles to Image of your Card Component. Such as,
<Image source={randomImage} style={{height: 200, width: 200}} />
Hope this will helps you. Feel free for doubts.
using the snack below:
https://snack.expo.io/ry_5rCk84
I am trying to display the icon 'wifi_off' using Material Icons in my react native app (just shared this as a snack on expo for easier sharing) but this is not a recognised value for prop 'name'.
and ends up displaying a '?' for unknown icon.
I am able to use wifi-off icon using 'material-community' icon set
import * as React from 'react';
import { Text, View, StyleSheet } from 'react-native';
import { Constants } from 'expo';
import {Icon} from 'react-native-elements';
// You can import from local files
import AssetExample from './components/AssetExample';
// or any pure javascript modules available in npm
import { Card } from 'react-native-paper';
export default class App extends React.Component {
render() {
return (
<View style={styles.container}>
<Text style={styles.paragraph}>
Change code in the editor and watch it change on your phone! Save to get a shareable url.
</Text>
<Card>
<AssetExample />
</Card>
<Icon name='wifi' size={50} type='material'/>
<Icon name='wifi-off' size={50} type='material-community' />
<Icon name='wifi_off' size={50} type='material' />
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
paddingTop: Constants.statusBarHeight,
backgroundColor: '#ecf0f1',
padding: 8,
},
paragraph: {
margin: 24,
fontSize: 18,
fontWeight: 'bold',
textAlign: 'center',
},
});
react-native-elements uses react-native-vector-icons to display the icons.
react-native-vector-icons has a directory where you can check which icons are available, you can look them up by name. https://oblador.github.io/react-native-vector-icons/
If you search for all the icons that have wifi in their name you find the following result for MaterialIcons and MaterialCommunityIcons
If you search for wifi_off you will find that there are no results.
Therefore wifi_off is not available to use.
It is also worth noting that react-native-elements currently doesn't support the latest version of react-native-vector-icons, you can see that in this currently open issue.
When you are using react native elements Icon, behind the scenes it is searching in a list https://github.com/oblador/react-native-vector-icons/blob/master/glyphmaps/MaterialIcons.json, here you can find the names of the Icons that are supported and as you can see "wifi_off" is not here, maybe you can try "signal-wifi-off".
I am having an issue with the image just showing up on the application. Through search results, I mostly see the solution being that that the height and width was required and missing, but I have already implemented with no results.
I have looked at the routes multiple times and don't see any issues on that end.
Lastly, I thought it could be something to do with the image. I have altered the size and it worked with the <Image /> tag. However, I need it to be a background image.
Current Code
import React from 'react'
import { View, Text, StyleSheet, ImageBackground } from 'react-native';
import { MaterialCommunityIcons } from '#expo/vector-icons'
export default function TitleScreen () {
return (
<View>
<ImageBackground
source={require('../assets/images/title_background.png')}
style={styles.backgroundImage}
imageStyle={{resizeMode: 'cover'}}
>
<Text>testing</Text>
{/* <MaterialCommunityIcons
name={'cards-outline'}
size={100}
/> */}
</ImageBackground>
</View>
)
}
const styles = StyleSheet.create({
backgroundImage: {
flex: 1,
width: '100%',
height: '100%',
}
});
Folder Layout
assets
-- images
--- title_background.png
components
-- TitleScreen.js
Answered! The answer was to add flex: 1 to the parent view container - for those running into the same problem.