I have an image like so:
I am trying to make a 100x100 square and then centering that image inside it. I am able to get the 100x100 square with this code:
import * as React from 'react';
import { View, Image, StyleSheet } from 'react-native';
class App extends React.Component {
render() {
return (
<View style={styles.container}>
<View style={styles.imageContainer}>
<Image
source={{ uri: 'https://storage.googleapis.com/iex/api/logos/GOOGL.png', }}
style={styles.image}
/>
</View>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center'
},
imageContainer: {
borderWidth: 1
},
image: {
width: 100,
height: 100
}
});
export default App;
However that cuts off the image:
Is there a way I can set a 100x100 width/height, but allow the image to resize as necessary to fit and be centered inside the square? Thanks!
Have you tried something like this? Its called resizeMode from React Native.
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center'
},
imageContainer: {
borderWidth: 1
},
image: {
width: 100,
height: 100,
resizeMode: 'contain'
}
});
Here is a link, for my has been very useful! is the jQuery Image Center. Centers an image by moving, cropping and filling spaces inside its parent container. Maintains aspect ratio.
http://boxlight.github.com/bl-jquery-image-center
For resize see the doc of resizeMode and resizeMethod in doc.
Related
I have a React Native View that I would like to have extend up to but not exceed a given width. Inside this View, I have a Text element that I would like to fill out the full width of its parent. It looks like this:
However, if I set the parent View to center align with alignSelf: 'center' the view will shrink to fit the text inside the Text view, like so:
Why does changing the alignment of a View cause it to change size, and how can I prevent this?
Expected Output:
Complete code to replicate this scenario:
import * as React from 'react';
import { Text, View, StyleSheet } from 'react-native';
export default function App() {
return (
<View style={styles.container}>
<View style={styles.box}>
<Text style={styles.paragraph}>Text</Text>
</View>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
backgroundColor: '#ecf0f1',
padding: 8,
},
box: {
backgroundColor: 'red',
height: 50,
maxWidth:200,
alignSelf: 'center' // <---REMOVE THIS LINE TO FILL VIEW
},
paragraph: {
textAlign: 'left',
backgroundColor: 'green',
},
});
Why adding width will not work
While setting a fixed width value would enforce the maximum size, it would prevent this element from shrinking down below that value. For this reason, specifying width is not a solution. Here is an example situation where the size of the view would extend past the display.
With width:
Expected:
import * as React from 'react';
import { Text, View, StyleSheet } from 'react-native';
export default function App() {
return (
<View style={styles.container}>
<View style={styles.box}>
<Text style={styles.paragraph}>Text</Text>
</View>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignContent:'center',//ADD THIS LINE
backgroundColor: '#ecf0f1',
padding: 8,
},
box: {
backgroundColor: 'red',
height: 50,
maxWidth:200,
},
paragraph: {
textAlign: 'left',
backgroundColor: 'green',
},
});
expo
This is frustrating. I have an image the exact same dimensions as the screen (of this device) and moreover same dimensions as the splash image. I just want it to fill the whole screen, above the other Views, for a few seconds after the splash goes away in order to do a custom animation.
Looking at other SO questions, Ive tried this so far (outside the main container of other app elements):
<Animated.View style = {styles.splash}>
<Image style = {{resizeMode: 'cover'}} source={require('./assets/splash2-txt.png')}/>
</Animated.View>
splash: {
flex: 1,
position: 'absolute',
zIndex: 4
},
and yet the image is scaled up and way off to the corner.
What is wrong here / how can I just fill the screen with the image?
Please use react-native ImageBackground for filling image in background, refer the example code given below
import React from "react";
import { ImageBackground, StyleSheet, Text, View } from "react-native";
const image = { uri: "https://reactjs.org/logo-og.png" };
const App = () => (
<View style={styles.container}>
<ImageBackground source={image} style={styles.image}>
<Text style={styles.text}>Inside</Text>
</ImageBackground>
</View>
);
const styles = StyleSheet.create({
container: {
flex: 1,
flexDirection: "column"
},
image: {
flex: 1,
resizeMode: "cover",
justifyContent: "center"
},
text: {
color: "grey",
fontSize: 30,
fontWeight: "bold"
}
});
export default App;
Use StyleSheet.absoluteFillObject in your image style instead of flex.
It should be something like...
import * as React from 'react';
import { Image, View, StyleSheet, StatusBar } from 'react-native';
export default function App() {
return (
<View style={styles.container}>
<StatusBar barStyle="light-content" />
<Image style={styles.image} source={{uri: 'https://reactjs.org/logo-og.png'}} />
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
justifyContent: 'center'
},
image: {
...StyleSheet.absoluteFillObject,
resizeMode: 'cover',
},
});
I have an app which the user holds the screen (anywhere) to display an animation over the background. When the user releases the screen the animation stops and the background reappears. The problem is that I just don't know how to get the animated image to cover the entire screen.
At the moment it is a small rectangle in the centre of the screen.
Here's the code from the render and the style sheet:
render() {
return (
<ImageBackground source={background} style={styles.background}>
<TouchableOpacity style={styles.background}
onPressIn={this.onItemMouseDown}
onPressOut={this.onItemMouseUp}
>
</TouchableOpacity>
{this.state.isOn === true ? (
<View style={styles.background}>
<Text style={styles.timer}>{this.state.time}</Text>
{this.state.stateImages.map((item, index) => {
const opacity = this.opacity[index];
return (
<Animated.View
key={item.id}
style={[styles.anim, { animations: item, opacity}]}
>
<Image source={item.source} style={styles.animImage}/>
</Animated.View>
);
})}
</View>
) : null}
</ImageBackground>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
// justifyContent: "center",
// alignItems: 'center',
// position:"absolute"
},
background: {
flex: 1,
resizeMode: 'cover',
justifyContent:'center',
},
anim: {
flex: 1,
resizeMode :'cover',
alignSelf: "center",
position: 'absolute',
},
animImage:{
flex: 1,
resizeMode :'cover',
},
timer:{
alignSelf: "center",
zIndex: 100,
},
I've read:
Full screen background image in React Native app
https://css-tricks.com/snippets/css/a-guide-to-flexbox/
Setting component height to 100% in react-native
https://reactnative.dev/docs/layout-props
How do I center one image over another in React Native
Image resizing in React Native
But none of the suggestions work.
I think because this is using the <Animated.View/> which uses 2 styles styles.anim and styles.animImage it's not as straight forward as it seems.
How would I make this animated.view cover the screen without using fixed width and height (which wouldn't be compatible with different screen sizes)?
Any ideas?
T
I want to do width: 100% - 50 so I can add an icon which is 50 wide on the right hand side of it.
I have got width: 100% - 20% working by using react-native-extended-styles but I don't see why that is useful because you can do width: '80%'. I cannot get width: 100% - 50 working. Is there a way?
Trying to use the onLayout event to get the container width, then set the <autocomplete> to 100% - 50 of the container width but it isn't working.
let Location = (props) => {
let locationInputElement
const blur = () => {
locationInputElement.blur()
}
let inputContainerWidth
return (
<View style={styles.formItem}>
<View
onLayout={(event) => {
inputContainerWidth = event.nativeEvent.layout.width
console.log(inputContainerWidth)
}}
<Autocomplete
data={props.autocompleteResults.predictions}...
style={{
borderRadius: 8,
backgroundColor: 'red',
alignSelf: 'stretch',
paddingLeft: 10,
position: 'relative',
...styles.label,
...styles.labelHeight,
width: inputContainerWidth - 50
}}
/>
</View>
</View>
)
}
It does console.log 335 when it console.logs inputContainerWidth but the width of the <autocomplete> is 100% still.
I'd agree with Viktor, you should be able to achieve this using Flex Box.
Here's something I put together: https://snack.expo.io/B1jDKOhyb
You set the flexDirection of the formRow to row, and then the first child (the holder View for your AutoComplete component to flex: 1. This makes it fill all available space. The next child View is your icon holder. Which you can set to whatever value you want (in this case 50).
export default class App extends Component {
render() {
return (
<View style={styles.container}>
<View style={styles.formRow}>
<View style={styles.formItem}>
// AutoComplete component goes here
</View>
<View style={styles.formIcon}>
// Icon goes here
</View>
</View>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
paddingTop: 100
},
formRow: {
flexDirection: 'row',
height: 50,
},
formItem: {
flex: 1,
backgroundColor: 'dodgerblue',
},
formIcon: {
width: 50,
backgroundColor: 'greenyellow',
},
});
This can easily be solved by using Dimensions.
import { Dimensions } from 'react-native';
const MyComponent = () => {
return <Text style={{height: Dimensions.get('window').height - 100}}></Text>
};
export default MyComponent;
You can do it without computing width. Use marginHorizontal: 50 with width:100 or flex:1.
Your code not working because, it's rendered then inputContainerWidth updated. To make it work, there should be another render with new inputContainerWidth. So you can't use a stateless component. Change Location to regular component and add inputContainerWidth to state.
Consider using useWindowDimensions from react-native (see docs):
import { useWindowDimensions } from 'react-native';
const { height, width } = useWindowDimensions();
I did margin: -50 in the parent and it worked for me
Suppose this is the layout:
<View style={styles.container}>
<View style={styles.titleWrapper}>
...
...
</View>
<View style={styles.inputWrapper}>
...
...
</View>
<View style={styles.footer}>
<TouchableOpacity>
<View style={styles.nextBtn}>
<Text style={styles.nextBtnText}>Next</Text>
</View>
</TouchableOpacity>
</View>
</View>
I want to make the view with the styles of footer to position at the bottom of the screen. I tried giving the alignSelf property to the footer, but instead of positioning at the bottom, it positions it to the right side of the screen. How can I make the footer item stick to the end? Thank you.
I would use the following approach:
<View style={styles.container}>
<View style={styles.contentContainer}> {/* <- Add this */}
<View style={styles.titleWrapper}>
...
</View>
<View style={styles.inputWrapper}>
...
</View>
</View>
<View style={styles.footer}>
...
</View>
</View>
var styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#F5FCFF',
},
titleWrapper: {
},
inputWrapper: {
},
contentContainer: {
flex: 1 // pushes the footer to the end of the screen
},
footer: {
height: 100
}
});
This way the styles of titleWrapper and inputWrapper can be updated without breaking the layout of your app and the components themselves are easier to re-use :)
In React Native, the default value of flexDirection is column (unlike in CSS, where it is row).
Hence, in flexDirection: 'column' the cross-axis is horizontal and alignSelf works left/right.
To pin your footer to the bottom, apply justifyContent: 'space-between' to the container
for me the answer was to create a container view for the elements, then for the style.
bottomContainer: {
flex: 1,
justifyContent: 'flex-end',
}
Absolutely position is another way to fix footer, just like:
footer: {
position: 'absolute',
height: 40,
left: 0,
top: WINDOW_HEIGHT - 40,
width: WINDOW_WIDTH,
}
To fix a View to the bottom, simply use: marginTop: 'auto' .
This worked for me after searching like an hour on the net. I tried experimenting and it worked!
Consider a screen structure
<View style={styles.container}>
<View style={styles.body}> ... </View>
<View style={styles.footer}>...</View>
</View>
You can do it cleanly using Flexbox approach utilizing flex-grow.
const Styles = StyleSheet.create({
container:{
flexDirection: 'column', // inner items will be added vertically
flexGrow: 1, // all the available vertical space will be occupied by it
justifyContent: 'space-between' // will create the gutter between body and footer
},
})
Note: In case of nested elements, you have to ensure that the parent container has enough height to work with when using flexGrow. Set backgroundColor on parents and child to debug.
To do this you can use the Stylesheet element position: 'absolute'.
/*This is an Example to Align a View at the Bottom of Screen in React Native */
import React, { Component } from 'react';
import { StyleSheet, View, Text } from 'react-native';
export default class App extends Component {
render() {
return (
<View style={styles.containerMain}>
<Text> Main Content Here</Text>
<View style={styles.bottomView}>
<Text style={styles.textStyle}>Bottom View</Text>
</View>
</View>
);
}
}
const styles = StyleSheet.create({
containerMain: {
flex: 1,
alignItems: 'center',
justifyContent: 'center',
},
bottomView: {
width: '100%',
height: 50,
backgroundColor: '#EE5407',
justifyContent: 'center',
alignItems: 'center',
position: 'absolute', //Here is the trick
bottom: 0, //Here is the trick
},
textStyle: {
color: '#fff',
fontSize: 18,
},
});
You can use this style:
row: {
flexDirection: 'row',
height: 50,
justifyContent: 'center',
alignItems: 'center',
position: 'absolute', //Here is the trick
bottom: 0,
}
embed other content in a scrollview
<View style={styles.container}>
<ScrollView> {/* <- Add this */}
<View style={styles.titleWrapper}>
...
</View>
<View style={styles.inputWrapper}>
...
</View>
</ScrollView>
<View style={styles.footer}>
...
</View>
</View>
In react native, there are some properties like position: 'absolute', bottom: 0, which you will want to give to your button view
Quick example in essence, based on #David's answer:
<View style={{flex: 1}}>
<View style={{flex: 1}}>
<Text>Main content</Text>
</View>
<Text>Footer</Text>
</View>
import React from 'react'
import { View, StyleSheet } from 'react-native'
function moveToBottom(component) {
return (
<View style={styles.container}>
{component}
</View>
)
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'flex-end',
marginBottom: 36
}
})
export default moveToBottom
Now in our screen, we just need to import:
import moveToBottom from 'library/utils/moveToBottom'
and wrap our button:
{
moveToBottom(
<ImageButton
style={styles.button}
title={strings.onboarding.welcome.button}
onPress={() => {
this.props.navigation.navigate('Term')
}} />
)
}
I tested it and I approve it's the best option to respect the layout without having fixed things to bottom, which is not possible if you use react-native-web in addition of react-native, because people resize and elements overlap on each over.
Source: https://medium.com/react-native-training/position-element-at-the-bottom-of-the-screen-using-flexbox-in-react-native-a00b3790ca42
I have a case in which I have to show a image in the bottom like this, as you can see the sky-blue image is not poped-up with keyboard.
so for this I have created a functional component for image in bottom.
import React, { useEffect, useState } from "react";
import { Keyboard, View, Image } from "react-native";
export const BottomImage = (props) => {
const [shouldShow, showImage] = useState(true);
useEffect(() => {
Keyboard.addListener("keyboardDidShow", _keyboardDidShow);
Keyboard.addListener("keyboardDidHide", _keyboardDidHide);
return () => {
Keyboard.removeListener("keyboardDidShow", _keyboardDidShow);
Keyboard.removeListener("keyboardDidHide", _keyboardDidHide);
};
}, []);
let _keyboardDidShow = () => {
showImage(false)
}
let _keyboardDidHide = () => {
showImage(true)
}
return (<ViewToRender show={shouldShow} src={props.image} />)
}
function ViewToRender(props) {
return props.show ? <Image style={{ position: 'absolute', bottom: 0 }} source={props.src} /> : <View />
}
and to use this Bottom image you have to pass your image to it like :
<BottomImage image={AppImage.signupbottom} />
This can be a bit tricky given that parent components can still affect the height of children with 'absolute' styles, I also tried doing "bottom: 0, height: 'auto'" like with normal HTML/CSS, but it didn't work out well, down the line I'll probably create a general component which makes sure the view can fit into the screen size. End result of view with contents
<View> component parameters
style={{
position: 'absolute',
left: 0,
padding: ContainerPadding,
top: TopOffset,
width: ScreenWidth
}}
onLayout={(event) => {
var {x, y, width, height} = event.nativeEvent.layout; // get the View's dimensions after 1st render
SetTopOffset(ScreenHeight - height - HeaderHeight); // Set 'top' to: screen size - height (of view) - parent top offset (optional if no parent offset)
}}
With useState:
const [TopOffset, SetTopOffset] = useState<number>(0); // Controls 'top' of screen
HeaderHeight is the height which is added to all my page components, you can remove this variable if you do not have any top spacing. (currently set to 64 default and this variable is updated based on device)
ScreenWidth & ScreenHeight are calculated here: export const ScreenWidth = Dimensions.get('screen').width; export const ScreenHeight = Dimensions.get('screen').height;
ContainerPadding is a general padding number used across my project (currently set to 12.5)