I have some components wrapped in a ScrollView and for some condition the bottom most component shouldn't render. When that happens, I use LayoutAnimation to hide it. The problem is that when the component disappear, the ScrollView jumps to the new content height directly, without any animation at all.
I want to use LayoutAnimation since I have screens where the contents height is unknown.
Example image
If you look at the image, when the button is pressed, the screen will instantly jump to the blue box without any animation.
state = { showGreenBox: false };
renderBottomBox() {
if (this.state.showGreenBox) {
return (
<View style={{ height: 300, width: 100, backgroundColor: 'green' }} />
);
}
}
render() {
return (
<ScrollView>
<View style={{ height: 300, width: 100, backgroundColor: 'red' }} />
<View style={{ height: 300, width: 100, backgroundColor: 'blue' }} />
{this.renderBottomBox()}
<TouchableOpacity
onPress={() => {
LayoutAnimation.configureNext(LayoutAnimation.Presets.spring);
this.setState({ showGreenBox: !this.state.showGreenBox });
}}
>
<Text>Press to collapse green box</Text>
</TouchableOpacity>
</ScrollView>
);
}
Related
I'm trying to fit my background image to cover the whole app but its not, even though i've tested most of similar threads here so any help is appreciated.
I've made some changes to the original source and added an arrow towards the left edge of the image that i was hoping to have at the edge when i open up the EXPO app on my phone, but i only see a few pixels of the arrow at the left edge.
**app.js**
function HomeScreen() {
return (
<ImageBackground source={require('./assets/bgImage.jpg')} style={styles.bgImage}>
<View>
<Text>Home Screen</Text>
</View>
</ImageBackground>
);
}
bgImage: {
flex: 1,
width: null,
height: null,
resizeMode: 'cover',
justifyContent: 'center',
alignItems: "center"
}
try this :-
import React from 'react';
import { ImageBackground, View, Text } from 'react-native';
const HomeScreen = () => {
return (
<ImageBackground source={require('../assets/apple.jpg')}
style={{
position: "absolute",
top: 0,
left: 0,
bottom: 0,
right: 0,
flex: 1,
alignItems: "center"
}}>
<View style={{
width: '90%',
height: 200,
backgroundColor: "red",
justifyContent: "center",
alignItems: "center",
}}>
<Text>Home Screen</Text>
</View>
</ImageBackground>
);
}
export default HomeScreen;
It is working fine.
I want create a rotate icon inside a image:
<ImageBackground style={stylesNative2.image} source={{ uri }} >
<TouchableOpacity onPress={ () => { alert("handler here") }} tyle={styles.rotateImageIcon}>
<Icon name='rotate-ccw' type='Feather' style={styles.rotateImageIcon} />
</TouchableOpacity>
</ImageBackground>
const stylesNative2 = StyleSheet.create({
image: {
zIndex: 0,
position: 'absolute',
height: h,
width: WIDTH,
resizeMode: 'cover',
transform: [{ rotate: this.state.imageRotation + 'deg' }]
}
});
const styles = StylesManager.getStyles({
rotateImageButton: {
backgroundColor: 'transparent',
elevation: 0,
zIndex: 1
},
rotateImageIcon: {
marginTop: '1rem',
marginLeft: '1rem',
fontSize: '1.7rem',
color: 'white',
}
});
The icon appear but the TouchableOpacity is not working.
Any idea why it's not working?
I think it's because ImageBackgroud have a pointerEvent like this one:
pointer-events: none;
http://facebook.github.io/react-native/docs/view#pointerevents
Can you try to wrap your <TouchableOpacity> on a <View>?
Mayby it's the zIndex...
A touchable opacity is transparent so you don't have to add zIndex on it.
When we add TouchableOpacity inside the ImageBackground .
We need to add the zindex greater than ImageBackground.
like zindex:100
Elements with a higher index will be placed on top of elements with a lower index. Note: Z index only works on positioned elements ( position:absolute , position:relative , or position: fixed
I tried to run my code on various screen sized emulators and the layout of my design varies from device to device. I need help to make the layout more responsive and fixed on different sized screens such as tablets, 3"mobile and 6"mobile.
-----------or connect with us on----------- I want to style this line in better way and that remains the same look on every device
I tried using the dimensions of the screen by defining the width and height using variables, and by describing the values in percentages, but nothing worked.
import React, { Component } from 'react';
import { View,TouchableOpacity, Text, StyleSheet, Image, Dimensions } from 'react-native';
import BacgroundImage from './BackgroundImage';
import Buttons from './Reusable/Button';
const { width: WIDTH } = Dimensions.get('window');
class LaunchScreen extends Component {
render() {
return (
<BacgroundImage>
<View style={styles.logoContainer}>
<Image
source={require('./images/logo.png')}
style={styles.PlaceLogo}
/>
</View>
<View style={styles.Buttons}>
<Buttons style={styles.signupButton}
onPress={() => navigate('Login')}>
<Text style={styles.buttonText}> SIGN UP</Text>
</Buttons>
<Buttons style={styles.loginButton}>
<Text style={styles.buttonText}> SIGN IN</Text>
</Buttons>
</View >
<View style={styles.sepratorView}>
<Text style={styles.sepratorText}>--------- or connect with us on ---------</Text>
</View >
<View style={styles.socialButtonStyle}>
<TouchableOpacity
style={styles.fbstyle}
activeOpacity={0.5}
>
<Image
source={require('./images/facebookicon.png')}
style={styles.iconstyle}
/>
<View
style={styles.sepratorLine}
/>
<Text
style={styles.socialButtonText}
>FACEBOOK</Text>
</TouchableOpacity>
<TouchableOpacity
style={styles.googlestyle}
onPress={this.signIn}
activeOpacity={0.5}
>
<Image
source={require('./images/google.png')}
style={styles.iconstyle}
/>
<View
style={styles.sepratorLine}
/>
<Text style={styles.socialButtonText} >GOOGLE</Text>
</TouchableOpacity>
</View>
</BacgroundImage>
);
};
}
const styles = StyleSheet.create({
logoContainer: {
flex: 1
},
PlaceLogo: {
width: WIDTH - 140,
margin: 75,
resizeMode: 'center',
justifyContent: 'center',
alignItems: 'center',
},
yosoButtons: {
width: WIDTH - 80,
justifyContent:'center',
marginTop:350
},
signupButton: {
height:40,
paddingTop:7,
marginBottom: 15,
},
loginButton: {
height:40,
paddingTop:7,
marginBottom: 15
},
buttonText: {
},
sepratorText: {
textAlign:'center',
fontSize:20,
color: '#b6b7ba',
},
sepratorView: {
flexDirection: 'row',
justifyContent:'center',
alignItems:'center'
},
socialButtonStyle:{
flex:1,
flexDirection:'row',
justifyContent:'center',
alignItems:'center',
margin:5
},
fbstyle:{
flex:1,
flexDirection:'row',
borderColor:'white',
alignItems:'center',
backgroundColor:'#485a96',
borderWidth:1,
borderRadius:35,
height: 40,
marginLeft:15,
marginRight:15
},
googlestyle:{
flex:1,
flexDirection:'row',
alignItems:'center',
backgroundColor:'#dc4e41',
borderWidth:1,
borderRadius:35,
borderColor:'white',
height: 40,
marginRight:15
},
iconstyle:{
resizeMode:'stretch',
height:25,
width:25
},
sepratorLine:{
backgroundColor:'white',
width:2,
height: 40
},
socialButtonText:{
color: '#fff',
flex:1,
textAlign: 'center',
fontSize: 15,
fontWeight: "bold"
}
});
export default LaunchScreen;
I want the layout to remain the same. Both the logo and buttons remain at the same position on every device display.
And I want a better dynamic solution for separator I have used in code
--------------or connect with us on-----------
I got a workaround solution for this problem. I am assigning values using the height and width of the screen to the styling.
import { StyleSheet, Dimensions } from 'react-native';
const { width: WIDTH, height: HEIGHT } = Dimensions.get('window');
SomeText: {
fontSize: HEIGHT / 38,
marginTop: WIDTH / 20,
}
The problem I'm having is that the image inside the image, is on top of the outside image, the outside image is a half transparent image so I want it to be ON TOP of the nested image, as an overlay image, what can I do?
<Image
style={it}
source={require('../../img/Rarities/red.png')}
>
<View>
{
item[2] != null ?
<View style={{ width: 15, height: 15, backgroundColor: item[2].Color }} />
: null
}
<Image
style={{height:'70%',width:'70%'}}
source={{ uri: item[1].base64 }}
/>
</View>
</Image>
I tried:
changing the zIndex of the images didn't work..
In React Native, components are rendered in the order they are defined - therefore it can be tricky to reverse the order and render a parent on top of a child.
Instead, you can render the images as siblings, and use a parent container component with a little position: absolute trickery to get the images to align on top of each other.
For the following view structure:
<View style={styles.imageContainer}>
<Image source={{uri: image1}} style={styles.bottom} />
<Image source={{uri: image2}} style={styles.top} />
</View>
You can achieve this effect with following styles. See inline comments for explanation:
const styles = StyleSheet.create({
// The container controls the top image size
imageContainer: {
width: 200,
height: 200
},
bottom: {
// horizontal margin: (100% -width) / 2
marginHorizontal: '15%',
// vertical margin: (100% - height) / 2
marginVertical: '15%',
width: '70%',
height: '70%'
},
top: {
// positioned absolutely
position: 'absolute',
opacity: 0.5,
// full width/height of imageContainer
width: '100%',
height: '100%'
},
});
You can see it in action in this Snack demo.
I'm not sure that i understand what are you meaning correctly but you can use the Image components like this if you want to have them inside each other:
<View>
<Image
style={{flex:1}}
source={require('./img/favicon.png')}
/>
<Image
style={{height:'30',width:'30', position:'absolute'}}
source={require('./img/favicon.png')}
/>
</View>
Note: the Image sources and the dimensions should be replaced.
For some reason when I put Text inside Image it stops wrapping. I've tried flexWrap: 'wrap' but it doesn't help.
Here is how it looks like
If I put the Text outside of Image than it works OK.
Here is the code:
class wraptest extends Component {
render() {
return (
<View style={styles.container}>
<Image
source={require('./image.jpg')}
style={styles.image}>
<View style={styles.textContainer}>
<Text style={styles.text}>Text goes here.</Text>
</View>
</Image>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
},
image: {
flex: 1,
resizeMode: 'cover',
justifyContent: 'center',
},
textContainer: {
backgroundColor: 'transparent',
alignItems: 'center',
},
text: {
fontSize: 40,
fontWeight: 'bold'
}
});
I've also pushed full project here https://github.com/OleksandrBezhan/react-native-text-wrap-test
The reason the text wraps when it is outside of the image is because it is a direct child of the "container" style which defines the flex box. Try putting flex: 1 on either the textContainer or text styles.