// How do you set the image on the top of the screen without losing the aspect ration?
[![import React, { Component } from 'react';
import { AppRegistry, View, Image, StyleSheet } from 'react-native';
export default class DisplayAnImageWithStyle extends Component {
render() {
return (
<View style={{flex:1}}>
<Image
resizeMode="contain"
style={{flex:1}}
source={{uri: 'https://i.pinimg.com/originals/ba/84/1c/ba841cc07934b508458a7faea62141a8.jpg'}}
/>
</View>
);
}
}
// Skip these lines if you are using Create React Native App.
AppRegistry.registerComponent(
'DisplayAnImageWithStyle',
() => DisplayAnImageWithStyle
);][1]][1]
// Here the liked image shows that it is not fitting well... it is not showing from the top... do you have any idea how I can set the image without any padding?
[1]: https://i.stack.imgur.com/LYNKn.png
So you might wanna use resizeMode: 'cover' with a height and width.
<Image
resizeMode="contain"
style={{ width: 200, height:220, resizeMode: 'cover'}}
source={{uri: 'https://i.pinimg.com/originals/ba/84/1c/ba841cc07934b508458a7faea62141a8.jpg'}}
/>
Here's an example https://snack.expo.io/HJTFg9tU4
Let me know if this works for you.
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.
Background
I have an image placed on a screen meant to show when the screen loads other content.
I want to center the image so it is always center on all devices.
Problem
Currently the image shows up top center. I would like it to be aligned vertically as well. Also to be sure that it will always look the same on all devices.
Question
What is the solution to make sure the image is always centered and the right size for all devices?
Example,
My current code,
In Photoshop
Image is 300 Resolution
Height is 776 px
Width is 600 px
I want the image to be centered horizontally and vertically in all devices and look good without pixelating. Natively I know I need to set the image sizes. But from my understanding in React Native I can use on image but then use JSX to handle it being responsive.
import React from 'react';
import {
StyleSheet,
View,
Image,
} from 'react-native';
const logo = require('../images/logo.jpg');
const LoadingScreen = () => (
<View>
<Image
style={styles.logo}
source={logo}
/>
</View>
);
const styles = StyleSheet.create({
logo: {
justifyContent: 'center',
alignItems: 'center',
width: 300,
height: 400,
},
});
export default LoadingScreen;
You need to set the style of <View> for justifyContent and alignItems for centering the <Image>.
Should be like this :
const LoadingScreen = () => (
<View style={styles.container}>
<Image
style={styles.logo}
source={logo}
/>
</View>
);
const styles = StyleSheet.create({
container: {
justifyContent: 'center',
alignItems: 'center',
},
logo: {
width: 300,
height: 400,
},
});
Or you can use alignSelf on the <Image> to make it center, but it will still need to add justifyContent on <View> to make it center vertically.
The View container should have styling as
flexDirection: 'column'
justifyContent: 'center'
alignItems: 'center'
height: '100%'
The height makes sure it spans throughout the page, thus making the image become both vertically and horizontally aligned.
For the image size, I think using percentage will do the trick instead of defining definite width/height.
Set in view:
justifycontent:center
And in child:
alignself:center
And perform in task.
Set in parent view:
justifycontent:center
And in child set:
alignself:center
I am trying to implement react native webview component in my application, but the web view is not loading any url its just showing the white page.
var React = require('react-native');
var{
View,
Text,
StyleSheet,
WebView
} = React;
module.exports = React.createClass({
render: function(){
return(
<View style={styles.container}>
<WebView source={{uri: 'https://m.facebook.com'}} style= {styles.webView}/>
</View>
);
}
});
var styles = StyleSheet.create({
container: {
flex:1,
backgroundColor: '#ff00ff'
},webView :{
height: 320,
width : 200
}
});
Below is the screenshot of the output .
I had this issue. WebView would render when it was the only component returned, but not when nested in another View component.
For reasons I'm not entirely sure of the issue was resolved by setting a width property on the WebView component.
class App extends React.Component {
render() {
return (
<View style={styles.container}>
<WebView
source={{uri: 'https://www.youtube.com/embed/MhkGQAoc7bc'}}
style={styles.video}
/>
<WebView
source={{uri: 'https://www.youtube.com/embed/PGUMRVowdv8'}}
style={styles.video}
/>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
justifyContent: 'space-between',
},
video: {
marginTop: 20,
maxHeight: 200,
width: 320,
flex: 1
}
});
I'm facing same issue. What I observed is that WebView doesn't work if it's nested. If component returns just WebView, then everything is fine.
Using the answers from other users, I was able to get my react native with webview working both inside a view and outside a view. My problem came down to two things. Being on the android emulator and behind a proxy, I just had to go to my browser (chrome) in the android emulator and sign in to the corporate proxy. Secondly, some sites work and others will not work. Whether the webview was nested or not inside of a View tag, some sites like cnn.com and slack.com etc will work fine, but no matter what settings I tried for google.com it wouldn't work (even though the proxy will definitely allow google.com) Lastly, when I rebuild my application and push to the emulator the new app, sometimes it took an inordinately long time to load any site. But once the site was loaded, the links are quick and responsive. So if you don't at first see something after a build, also be patient. Hope this helps someone else.
My final app.js
import React, { Component } from 'react';
import {
Platform,
StyleSheet,
Text,
View,
Dimensions
} from 'react-native';
import { WebView } from 'react-native';
const deviceHeight = Dimensions.get('window').height;
const deviceWidth = Dimensions.get('window').width;
type Props = {};
export default class App extends Component<Props> {
render() {
return (
<View style={{flex:1}}>
<WebView
style={styles.webview}
source={{uri: 'https://www.slack.com'}}
javaScriptEnabled={true}
domStorageEnabled={true}
startInLoadingState={false}
scalesPageToFit={true} />
</View>
);
}
}
const styles = StyleSheet.create({
webview: {
flex: 1,
backgroundColor: 'yellow',
width: deviceWidth,
height: deviceHeight
}
});
WebView works well on Android. However you need to enable javascript and dom storage for some web pages.
<WebView style={styles.webView}
source={{uri: 'https://google.com/'}}
javaScriptEnabled={true}
domStorageEnabled={true}
startInLoadingState={true}
>
</WebView>
If you want the component to render the entire page, you need to wrap it with View that has flex: 1. The code below works for me:
<View style={{flex:1, alignItems: 'flex-end'}}>
<WebView
source={{uri: this.state.webContentLink}}
startInLoadingState={true}
scalesPageToFit={true} />
</View>
WebView is being moved to react-native-webview
.
None of the other answers worked except this method:
npm install --save react-native-webview
Then use it as follows:
<View style={{ flex: 1, alignItems: 'flex-end' }}>
<WebView
source={{
uri: 'https://www.yahoo.com',
}}
startInLoadingState={true}
scalesPageToFit={true}
style={{
width: 320,
height: 300,
}}
/>
</View>
<View>
<WebView
source={{uri: this.props.link}}
style={styles.webview}
javaScriptEnabled={true}
domStorageEnabled={true}
startInLoadingState={true}
/>
</View>
and style as follows:
const React = require('react-native');
const { Dimensions } = React;
const deviceHeight = Dimensions.get('window').height;
const deviceWidth = Dimensions.get('window').width;
export default {
webview: {
width: deviceWidth,
height: deviceHeight
}
};
All this to deal with bad webview dimension, so just set a specific height and specific width too (deviceHeight and deviceWidth as the example above).
As of June 2020 (noting the date because React Native answers seem to become out-of-date quickly), the simplest solution to this appears to be:
import React from 'react'
import { View, StyleSheet } from 'react-native'
import { WebView } from 'react-native-webview'
export const ComponentWithWebView = () => {
return (
<View style={styles.view}>
<WebView source = {{uri: 'https://www.google.com/'}} />
</View>
)
}
const styles = StyleSheet.create({
view: {
alignSelf: 'stretch',
flex: 1,
}
}
This results in a WebView filling the available space and being nested within a View. I believe the typical problems faced when placing a WebView within a View is that View expects children to force the View to expand (that is, a Text component would take up some amount of width and height which the View then accommodates). WebView, on the other hand, expands to the size of the parent component unless a style is passed specifying the width. Therefore, a simple <View><WebView /></View> results in a 0 width and nothing shown on the screen. The earlier solutions of setting the WebView width work well but require either the device dimensions to be fetched (which might not be the desired width) or for the View to have an onLayout function AND have some way to expand the View to the desired space. I found it easiest to just apply the flex: 1 and alignSelf: 'stretch' for the View to fill the space as desired and then WebView to automatically follow suit.
Hope this helps someone before it becomes obsolete!
I ran into the same issue recently. And I found that
alignment: 'center'
was causing the issue for me. I commented it and the webView got loaded immediately.
I found the solution here :
https://github.com/facebook/react-native/issues/5974
'brunocvcunha's' response worked for me.
Let me give the simplest example which will work seamlessly:
import React from 'react';
import { WebView } from 'react-native';
export default class App extends React.Component {
render() {
return (
<WebView
source={{uri: 'https://github.com/facebook/react-native'}}
/>
);
}
}
Do not add your WebView component within a view that created problem and webview url is not rendered rather styles of view will be shown.
I had the same issue and spent a day attempting to fix it. I copied in the UIExplorer webview example, and that didn't work.
I ultimately ended up upgrading react and creating a new react-native project and copying the files in there, and that fixed it.
I wish I had a better answer as to why that fixed it, but hopefully that helps
Below is piece of the code which worked for me.
render: function(){
return(
<View style={styles.container}>
<WebView url={'https://m.facebook.com'} style= {styles.webView}/>
</View>
);
}
I am doing React Native Webview, Could you please suggest me how to makeWebview loading the uri
render() {
return (
<Modal
animationType="slide"
ref={"webModal"}
style={{
justifyContent: 'center',
borderRadius: Platform.OS === 'ios' ? 30 : 0,
width: screen.width,
height: screen.height,borderColor:'red',
borderWidth: 5
}}
position='center'
backdrop={false}
onClosed={() => {
// alert("Modal closed");
}}>
<View style={{ flexDirection: 'row', justifyContent: 'space-between', paddingHorizontal: 20, top: 10 }} >
<Text style={{ fontSize: 24, fontWeight: '700' }}>
Interests
</Text>
<Icon name="ios-close" size={40} color='purple' onPress={() => { this.refs.webModal.close() }} />
</View>
<WebView
source={{ uri: this.state.link }}
style={{ marginTop: 20,borderColor:'green',
borderWidth: 5 }}
/>
</Modal>
);
}
}
import { WebView } from 'react-native'; is deprecated
use below line instead
npm install react-native-render-html#4.1.2 --save
then
import HTML from 'react-native-render-html';
react-native-render-html starting with version 4.2.0, react-native-webview is now a peer dependency. As a result, you need to install it yourself.
Try
<WebView
source={{ uri: "https://inhall.in/" }}
style={Styles.webView}
javaScriptEnabled={true}
scalesPageToFit />
javaScriptEnabled={true} might help
After perusing the React Native Documentation I couldn't seem to find out how to make a <ScrollView> have a persistent scrollbar that doesn't fade out. How would I achieve that?
iOS
The underlying iOS native component, UIScrollView (technically, RCTEnhancedScrollView), doesn't support keeping the scroll indicators visible. For this reason, the React Native wrapper around it won't either.
There is a hack to get this working with the native component (see this answer for one approach). To accomplish this in React Native, you'd need to implement this hack on the native side, and then either create your own Native Module or fork React Native and modify their ScrollView component.
That said, the iOS Scroll View interface guidelines discourage this, so you may want to leave the indicators' behavior alone.
Android
A few approaches:
set <item name="android:overScrollMode">always</item>,
set android:fadeScrollbars="false" in XML, or
set ScrollView.setScrollbarFadingEnabled(false) in Java (e.g. in your custom native bridge code)
This is similarly discouraged as nonstandard UI unless you have a strong reason for it.
Adding answer since none of the above worked for me.
Android now has the persistentScrollbar props.
iOS does not support this. So I created a JS solution that can be used as follows:
<SBScrollView persistentScrollbar={true}>...</SBScrollView>
Basically, this functional component will use persistentScrollbar when on Android, while add a bar when we are on iOS. It is not smooth for now, but it is functional.
// #flow
import React, {useState} from 'react';
import {Platform, View, ScrollView} from 'react-native';
type Props = {|
persistentScrollbar?: boolean,
children?: React$Node,
|} & View.propTypes;
export default function SBScrollView({
persistentScrollbar = false,
children,
...other
}: Props) {
const [nativeEvent, setNativeEvent] = useState();
if (Platform.OS === 'android' || !persistentScrollbar) {
// Abdroid supports the persistentScrollbar
return (
<ScrollView persistentScrollbar={persistentScrollbar} {...other}>
{children}
</ScrollView>
);
}
const top = nativeEvent
? nativeEvent.contentOffset.y +
(nativeEvent.contentOffset.y / nativeEvent.contentSize.height) *
nativeEvent.layoutMeasurement.height
: 0;
// iOS does not support persistentScrollbar, so
// lets simulate it with a view.
return (
<ScrollView
scrollEventThrottle={5}
showsVerticalScrollIndicator={false}
onScroll={event => setNativeEvent(event.nativeEvent)}
{...other}>
{children}
<View
style={{
position: 'absolute',
top,
right: 4,
height: 200,
width: 4,
borderRadius: 20,
backgroundColor: 'gray',
}}
/>
</ScrollView>
);
}
I hope this can help others.
I was looking for a solution but I didn't find nothing, then I created a solution, I hope can help you with it.
I created a view View with height and width and put it over my scrollview, after that I used the Props of scrollview like onMomentumScrollBegin, onMomentumScrollEnd, onContentSizeChange and onScroll
after that I make a condition with a boolean variable, if this variable is false, the View is visible, if is false the View is hide, How do I active this variable? with the Prop onMomentumScrollBegin that detect when you use the scrollView and the same way to set the variable in false with onMomentumScrollEnd that detects when the scroll ends.
The Prop onContentSizeChange allows me to get the height and width of my scrollview, this values I used to calculate where would be set the scrollbar/scrollIndicator
and finally with the Prop onScroll I get the position.
the example:
<ScrollView
onMomentumScrollBegin={() => {this.setvarScrollState()}}
onMomentumScrollEnd={() => {this.setvarScrollStateRev()}}
scrollEventThrottle={5}
onContentSizeChange={(w, h) => this.state.hScroll = h}
showsVerticalScrollIndicator={false}
onScroll={event => { this.state.wScroll = event.nativeEvent.contentOffset.y }}
style={{ marginVertical: 15, marginHorizontal:15, width: this.state.measurements3.width}}>
{
Mydata.map((value, index) => {
return <TouchableOpacity>
<Text>{ value.MyDataItem }</Text>
</TouchableOpacity>
})
}
the functions:
setvarScrollState() {
this.setState({VarScroll: true});
}
setvarScrollStateRev() {
this.setState({VarScroll: false});
}
and the variable
this.state = {VarScroll: false}
Then my condition is
!this.state.VarScroll ?
<View
style = {{
marginTop: 200*(this.state.wScroll / this.state.hScroll),
marginLeft:338.5,
height: 35,
width: 2,
backgroundColor: 'grey',
position:'absolute'
}}
/>
: null
Why 200? because is the maximum value that my marginTop can set
Check the picture
Final note:
the scrollView have to be inside a View with the another View (scrollbar)
something like this
<View>
{/*---- ScrollBar and conditions----*/}
<View>
<View>
<ScrollView>
</ScrollView>
</View>