I am using react native snap carousel and I am trying to have the preview of the next card look the same height as the current card. Originally the preview is set to look centered but smaller. I would like the preview to look the same exact size.
I tried setting the containerCustomStyle to alignItems center which made it look closer to the result I wanted but the sizes are not the same. If you remove the contrainerCustomStyle you can see an exaggerated version of what I do NOT want.
I have a snack expo recreating my problem here as well as some code below. If I need to add a picture to clarify the result I would like, let me know!
I appreciate any insight at all more than you know.
renderCarouselItem = ({ item }) => {
return <View style={styles.cardContainer}>
<Text style={styles.name}>{item.name}</Text>
</View>;
};
render() {
return (
<Carousel
ref={(c) => {
this._carousel = c;
}}
data={this.state.coordinates}
renderItem={this.renderCarouselItem}
containerCustomStyle={styles.carousel}
sliderWidth={Dimensions.get('window').width}
itemWidth={300}
removeClippedSubviews={false}
/>
);
}
}
const styles = StyleSheet.create({
cardContainer: {
backgroundColor: 'red',
height: 100,
width: 300,
borderRadius: 10,
},
name: {
color: 'black',
fontSize: 22,
},
carousel: {
alignItems: 'center',
}
});
react-native-snap-carousel is deprecated. You should try react-native-reanimated-carousel
In the Card Component for react native elements
I'm trying to get rid of the border by setting the border to 0 and borderColor to transparent but there's still a gray outline
<Card
containerStyle={{borderWidth: 0, borderColor: 'transparent', elevation: 0}}
title='HELLO WORLD'
image={require('../images/pic2.jpg')}>
<Text style={{marginBottom: 10}}>
The idea with React Native Elements is more about component structure than actual design.
</Text>
</Card>
Thought it might have been box shadow, but that's not it either
I've got the same issue, and I've found that border appears because the Card element has an elevation default setted to 1
You can override this (for android) :
<Card containerStyle={{elevation:0, backgroundColor:#123}}/>
and in IOS:
const styles = {
container: {
shadowColor: 'rgba(0,0,0, .2)',
shadowOffset: { height: 0, width: 0 },
shadowOpacity: 0, //default is 1
shadowRadius: 0//default is 1
}
}
<Card containerStyle={styles.container} />
Its late but it seems that a lot of people still searching for the Answer.
React Native Elements by default have set both borderWidth and shadow Props, so in order to remove border completely you need to remove both Border and Shadow.
<Card containerStyle={styles.cardCnt}>
<Text>Content</Text>
</Card>
const styles = {
cardCnt: {
borderWidth: 0, // Remove Border
shadowColor: 'rgba(0,0,0, 0.0)', // Remove Shadow for iOS
shadowOffset: { height: 0, width: 0 },
shadowOpacity: 0,
shadowRadius: 0,
elevation: 0 // Remove Shadow for Android
}
};
It looks like react native elements' Card component has a grey border in all of the examples I've seen. I'd suggest building your own card component. Start with something like this and then style it however you want. This one has a bit of shadow which you can turn off by passing it a noShadow prop.
import React from 'react';
import { View, StyleSheet } from 'react-native';
const Card = (props) => {
let shadowStyle = {
shadowColor: COLORS.grey3,
shadowOffset: { width: 0, height: 0 },
shadowOpacity: .5,
shadowRadius: 12,
elevation: 1,
}
if (props.noShadow) {
shadowStyle = {}
}
return (
<View style={[styles.containerStyle, props.style, shadowStyle]}>
{props.children}
</View>
);
};
const styles = StyleSheet.create({
containerStyle: {
padding: 10,
marginHorizontal: 10,
backgroundColor: COLORS.white,
borderRadius: 3,
}
})
export { Card };
Then when you want to use it just
import { Card } from './yourCustomCardFile'
Then in your render method
<Card>
<Text>Any content you want to include on the card</Text>
<Text>More content that you want on the card</Text>
</Card>
set elevation to 0 and borderColor to white like this
<Card containerStyle={{ elevation: 0, borderColor: "white" }}>
set to screen background color
Dirty but problem solved.
I am having trouble working with some SVG in React Native.
I have a chart that is clickable and works well, I then needed to place another SVG on top of the chart in order to draw a line that would represent a limit score value. The problem that I am now facing is that I cannot click on the chart anymore since the view of the SVG is placed on top of it.
I made the background color of the SVG to be transparent so that I can at least see the chart behind it but, I do not know how to make it clickable again.
Is there any work around where I can maybe make the chart clickable trough a transparent view that is place on top?
It might be a stupid question but I am pretty new to both react and JS in general, so I could really use any type of help. :)
Here is the picture of the chart:
Polar Chart and Svg circle
And here the same Svg with a non-transparent background that, as you can see, covers almost the hole chart.
Svg covering the chart
Here's the Svg code:
export class NutritionChartSvg extends Component {
render() {
return (
<View style={styles.container} >
<Svg height={height * 0.5} width={width * 0.5} viewBox="0 0 100 100">
<Svg.Circle
id="circle"
cx="50"
cy="13"
r="40"
stroke="gray"
strokeWidth="0.6"
fill="none"
/>
<Text fill="black" fontSize="8" dy="-2">
<TextPath href="#circle" startOffset='181'>
100
</TextPath>
</Text>
</Svg>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
alignContent: 'center',
justifyContent: 'center' ,
position: 'absolute',
left: '25%',
height: 'auto',
width: 'auto',
},
});'
This is the chart form chartjs:
export const NutritionChart = (props) => {
return (
<Chart
chartConfiguration={
{
type: 'polarArea',
data: {
labels: ['Fiber', 'Protein', 'Healthy Oil', 'Good Energy', 'Immune
Defense'],
datasets: [
{
label: '# of Votes',
data: [
50,
140,
90,
120,
100,
],
backgroundColor: backgroundColor,
borderColor: borderColor,
borderWidth: datasets.border,
hoverBackgroundColor: hoverBackgroundColor,
},
],
},
options: {
layout: {
padding: {
top: options.layout.padding.top,
bottom: options.layout.padding.bottom,
}
},
legend: {
display: false,
fullWidth: false,
labels: {
fontSize: options.legend.labels.fontSize,
boxWidth: options.legend.labels.boxWidth,
padding: options.legend.labels.padding,
}
},
scale: {
display: false,
ticks: {
min:0,
max:200,
}
},
responsive: true,
maintainAspectRatio: false,
},
}
}
defaultFontSize={10}
/>
);
};
and they are together in a view :
<View style={styles.nutritionChart} key={3}>
<NutritionChart/>
<NutritionChartSvg/>
</View>
Either:
Move the limit line into the chart SVG, instead of laying it separately on top, or
Set pointer-events: none on the top SVG. This will make clicks pass right through it.
I need to make my View circular on a non solid colored background.
I tried using borderRadius and overflow: 'hidden', but it isn't working. I see that this is a known issue with React Native: https://github.com/facebook/react-native/issues/3198
There seems to be workarounds for images that are on top of a solid background, but my background is dynamic and on top of an image so therefore I can't hardcode it.
Are there any alternatives to get something like this to work?
The black square should be a circle:
Here's the code (P.S. I'm using react native webrtc, that's where I'm getting RTCView, but I think this works with a plain old View):
const styles = StyleSheet.create({
remoteVideoContainer: {
borderRadius: 50,
height: 100,
marginBottom: 20,
width: 100,
overflow: 'hidden',
backgroundColor: 'green',
},
video: {
flex: 1,
resizeMode: 'cover',
backgroundColor: 'blue',
},
});
export default VideoView = ({
videoURL,
}) => {
return (
<View style={styles.remoteVideoContainer}>
<RTCView
style={styles.video}
streamURL={videoURL}
mirror={true}
objectFit="cover"
/>
</View>
);
};
I'm not even sure if you can style the RTCView. The code doesn't expose a styling prop. https://github.com/oney/react-native-webrtc/blob/master/RTCView.js
This is the style of the view that i have used
backCover: {
position: 'absolute',
marginTop: 20,
top: 0,
bottom: 0,
left: 0,
right: 0,
}
Currently it has a white background. I can change the backgroundColor as i want like '#343434' but it accepts only max 6 hexvalue for color so I cannot give opacity on that like '#00ffffff'. I tried using opacity like this
backCover: {
position: 'absolute',
marginTop: 20,
top: 0,
bottom: 0,
left: 0,
right: 0,
opacity: 0.5,
}
but it reduces visibility of view's content.
So any answers?
Use rgba value for the backgroundColor.
For example,
backgroundColor: 'rgba(52, 52, 52, 0.8)'
This sets it to a grey color with 80% opacity, which is derived from the opacity decimal, 0.8. This value can be anything from 0.0 to 1.0.
The following works fine:
backgroundColor: 'rgba(52, 52, 52, alpha)'
You could also try:
backgroundColor: 'transparent'
Try this backgroundColor: '#00000000'
it will set background color to transparent, it follows #rrggbbaa hex codes
Surprisingly no one told about this, which provides some !clarity:
style={{
backgroundColor: 'white',
opacity: 0.7
}}
Try to use transparent attribute value for making transparent background color.
backgroundColor: 'transparent'
You should be aware of the current conflicts that exists with iOS and RGBA backgrounds.
Summary: public React Native currently exposes the iOS layer shadow
properties more-or-less directly, however there are a number of
problems with this:
1) Performance when using these properties is poor by default. That's
because iOS calculates the shadow by getting the exact pixel mask of
the view, including any tranlucent content, and all of its subviews,
which is very CPU and GPU-intensive. 2) The iOS shadow properties do
not match the syntax or semantics of the CSS box-shadow standard, and
are unlikely to be possible to implement on Android. 3) We don't
expose the layer.shadowPath property, which is crucial to getting
good performance out of layer shadows.
This diff solves problem number 1) by implementing a default
shadowPath that matches the view border for views with an opaque
background. This improves the performance of shadows by optimizing for
the common usage case. I've also reinstated background color
propagation for views which have shadow props - this should help
ensure that this best-case scenario occurs more often.
For views with an explicit transparent background, the shadow will
continue to work as it did before ( shadowPath will be left unset,
and the shadow will be derived exactly from the pixels of the view and
its subviews). This is the worst-case path for performance, however,
so you should avoid it unless absolutely necessary. Support for this
may be disabled by default in future, or dropped altogether.
For translucent images, it is suggested that you bake the shadow into
the image itself, or use another mechanism to pre-generate the shadow.
For text shadows, you should use the textShadow properties, which work
cross-platform and have much better performance.
Problem number 2) will be solved in a future diff, possibly by
renaming the iOS shadowXXX properties to boxShadowXXX, and changing
the syntax and semantics to match the CSS standards.
Problem number 3) is now mostly moot, since we generate the shadowPath
automatically. In future, we may provide an iOS-specific prop to set
the path explicitly if there's a demand for more precise control of
the shadow.
Reviewed By: weicool
Commit: https://github.com/facebook/react-native/commit/e4c53c28aea7e067e48f5c8c0100c7cafc031b06
Adding reference of React-Native Version 0.64
Named colors
Named Colors: DOCS
In React Native you can also use color name strings as values.
Note: React Native only supports lowercase color names. Uppercase color names are not supported.
transparent#
This is a shortcut for rgba(0,0,0,0), same like in CSS3.
Hence you can do this:
background: {
backgroundColor: 'transparent'
},
Which is a shortcut of :
background: {
backgroundColor: 'rgba(0,0,0,0)'
},
In case you have hex color, you can convert it to rgba and set the opacity there:
const hexToRgbA = (hex, opacity) => {
let c;
if (/^#([A-Fa-f0-9]{3}){1,2}$/.test(hex)) {
c = hex.substring(1).split('');
if (c.length === 3) {
c = [c[0], c[0], c[1], c[1], c[2], c[2]];
}
c = `0x${c.join('')}`;
return `rgba(${[(c >> 16) & 255, (c >> 8) & 255, c & 255].join(',')},${opacity})`;
}
throw new Error('Bad Hex');
};
const color = '#1f8b7f'; // could be a variable
return (
<View style={{ backgroundColor: hexToRgbA(color, 0.1) }} />
)
source that helped me
This will do the trick help you,
Add one View element and add style as below to that view
.opaque{
position:'absolute',
backgroundColor: 'black',
opacity: 0.7,
zIndex:0
}
The best way to use background is hex code #rrggbbaa but it should be in hex.
Eg: 50% opacity means 256/2 =128, then convert that value(128) in HEX that will be 80,use #00000080 80 here means 50% transparent.
Here is my solution to a modal that can be rendered on any screen and initialized in App.tsx
ModalComponent.tsx
import React, { Component } from 'react';
import { Modal, Text, TouchableHighlight, View, StyleSheet, Platform } from 'react-native';
import EventEmitter from 'events';
// I keep localization files for strings and device metrics like height and width which are used for styling
import strings from '../../config/strings';
import metrics from '../../config/metrics';
const emitter = new EventEmitter();
export const _modalEmitter = emitter
export class ModalView extends Component {
state: {
modalVisible: boolean,
text: string,
callbackSubmit: any,
callbackCancel: any,
animation: any
}
constructor(props) {
super(props)
this.state = {
modalVisible: false,
text: "",
callbackSubmit: (() => {}),
callbackCancel: (() => {}),
animation: new Animated.Value(0)
}
}
componentDidMount() {
_modalEmitter.addListener(strings.modalOpen, (event) => {
var state = {
modalVisible: true,
text: event.text,
callbackSubmit: event.onSubmit,
callbackCancel: event.onClose,
animation: new Animated.Value(0)
}
this.setState(state)
})
_modalEmitter.addListener(strings.modalClose, (event) => {
var state = {
modalVisible: false,
text: "",
callbackSubmit: (() => {}),
callbackCancel: (() => {}),
animation: new Animated.Value(0)
}
this.setState(state)
})
}
componentWillUnmount() {
var state = {
modalVisible: false,
text: "",
callbackSubmit: (() => {}),
callbackCancel: (() => {})
}
this.setState(state)
}
closeModal = () => {
_modalEmitter.emit(strings.modalClose)
}
startAnimation=()=>{
Animated.timing(this.state.animation, {
toValue : 0.5,
duration : 500
}).start()
}
body = () => {
const animatedOpacity ={
opacity : this.state.animation
}
this.startAnimation()
return (
<View style={{ height: 0 }}>
<Modal
animationType="fade"
transparent={true}
visible={this.state.modalVisible}>
// render a transparent gray background over the whole screen and animate it to fade in, touchable opacity to close modal on click out
<Animated.View style={[styles.modalBackground, animatedOpacity]} >
<TouchableOpacity onPress={() => this.closeModal()} activeOpacity={1} style={[styles.modalBackground, {opacity: 1} ]} >
</TouchableOpacity>
</Animated.View>
// render an absolutely positioned modal component over that background
<View style={styles.modalContent}>
<View key="text_container">
<Text>{this.state.text}?</Text>
</View>
<View key="options_container">
// keep in mind the content styling is very minimal for this example, you can put in your own component here or style and make it behave as you wish
<TouchableOpacity
onPress={() => {
this.state.callbackSubmit();
}}>
<Text>Confirm</Text>
</TouchableOpacity>
<TouchableOpacity
onPress={() => {
this.state.callbackCancel();
}}>
<Text>Cancel</Text>
</TouchableOpacity>
</View>
</View>
</Modal>
</View>
);
}
render() {
return this.body()
}
}
// to center the modal on your screen
// top: metrics.DEVICE_HEIGHT/2 positions the top of the modal at the center of your screen
// however you wanna consider your modal's height and subtract half of that so that the
// center of the modal is centered not the top, additionally for 'ios' taking into consideration
// the 20px top bunny ears offset hence - (Platform.OS == 'ios'? 120 : 100)
// where 100 is half of the modal's height of 200
const styles = StyleSheet.create({
modalBackground: {
height: '100%',
width: '100%',
backgroundColor: 'gray',
zIndex: -1
},
modalContent: {
position: 'absolute',
alignSelf: 'center',
zIndex: 1,
top: metrics.DEVICE_HEIGHT/2 - (Platform.OS == 'ios'? 120 : 100),
justifyContent: 'center',
alignItems: 'center',
display: 'flex',
height: 200,
width: '80%',
borderRadius: 27,
backgroundColor: 'white',
opacity: 1
},
})
App.tsx render and import
import { ModalView } from './{your_path}/ModalComponent';
render() {
return (
<React.Fragment>
<StatusBar barStyle={'dark-content'} />
<AppRouter />
<ModalView />
</React.Fragment>
)
}
and to use it from any component
SomeComponent.tsx
import { _modalEmitter } from './{your_path}/ModalComponent'
// Some functions within your component
showModal(modalText, callbackOnSubmit, callbackOnClose) {
_modalEmitter.emit(strings.modalOpen, { text: modalText, onSubmit: callbackOnSubmit.bind(this), onClose: callbackOnClose.bind(this) })
}
closeModal() {
_modalEmitter.emit(strings.modalClose)
}
Hope I was able to help some of you, I used a very similar structure for in-app notifications
Happy coding