Is there an alternative for position: 'sticky in react-native? - javascript

I'm trying to make an element stay at the top of the screen at all times, vene when scrolling. I found out that position: 'sticky' does this for regular html. I was wondering if there was something I could add to my css to make the element stick to one place while scrolling using react-native.

On ScrollView there is a prop called stickyHeaderIndices. Pass the index of the component that you want to be sticky in this prop. For example, if you want to sticky the header to be sticky from the below code, you have to just pass 1 in stickyHeaderIndices props like this :
import React from 'react';
import { View, ScrollView, StyleSheet, Text } from 'react-native';
const App = () => {
return (
<ScrollView stickyHeaderIndices={[1]}>
<View>
<Text style={styles.overline}>
Overline
</Text>
</View>
<View>
<Text style={styles.header}>
Header
</Text>
</View>
{/* Your others component goes here */}
</ScrollView>
)
}
const styles = StyleSheet.create({
overline: {
fontSize: 12,
fontWeight: '100'
},
header: {
fontSize: 24,
fontWeight: 'bold'
},
spacer: {
height: 10,
}
});
export default App;
This prop accepts the array, so you can also set multiple sticky components by passing the index of those all components.

Related

Javascript || React Native how to use map() [duplicate]

This question already has an answer here:
React native How to add Images with map()
(1 answer)
Closed 11 months ago.
import React from "react";
import { View, Text, StyleSheet, ScrollView, Image } from "react-native";
const Icons = [
{ name: "Food", uri: require("./images/Food.png") },
{ name: "Mart", uri: require("./images/mart.png") },
{ name: "Car", uri: require("./images/car.png") }
];
const IconSelection = Icons.map((icons) => (
<View>
<Image source={icons.uri} />
<Text style={{ textAlign: "center" }}>{icons.name}</Text>
</View>
));
const styles = StyleSheet.create({});
export default IconSelection;
Is my way of adding images to my const Icons correct? Basically I want to create like a list of Icons using images and able to call them. Previously my method is basically handcode them but I found it is very messy. I think maps() could help me but I'm not really sure how to use it too. Thank you.
import { StatusBar } from "expo-status-bar";
import { StyleSheet, Text, View } from "react-native";
import IconSelection from "./icons";
export default function App() {
return (
<View style={styles.container}>
<Text>Open up App.js to start working on your app!</Text>
<IconSelection />
<StatusBar style="auto" />
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: "#fff",
alignItems: "center",
justifyContent: "center",
},
});
It says Check the render method of app. The error source is pointing require().
You are returning an array of items.
You most likely need a new component that wraps your icons. Something like this
const IconSelection = () => {
return <>
Icons.map((icons) => (
<View>
<Image source={icons.uri} />
<Text style={{ textAlign: "center" }}>{icons.name}</Text>
</View>
)
</>
}
You also need to make sure that the paths to images are correct and you have proper loaders for that file type.

Touchable Opacity not responding in stack navigator screen - React Native

I'm building a React Native app, it uses React Navigation. I use TouchableOpacity throughout the app, however, in a stack navigator screen, it doesn't seem to work at all. Touching the element doesn't change the opacity and the onpress function doesn't work. The screen itself displays fine and all other screens in my app have TouchableOpacity's that work fine.
Using button doesn't respond either, I'm thinking this is a react navigation issue potentially? There is no issues transitioning to the screen though?
Here is my screen;
import React, {Component} from 'react';
import { View, Text, TouchableOpacity, Alert, Button} from 'react-native';
class RaceScreen extends React.Component {
constructor(props) {
super(props);
this.state = {
}
}
render() {
return (
<View style={{ flex: 1, alignItems: 'center', backgroundColor:'rgba(30,30,30,0.98)'}}>
<TouchableOpacity onPress = {() => console.log('Hello')}>
<View style={{ margin:50, height:100, width: 200, backgroundColor:'red', alignItems:'center', justifyContent:'center' }}>
<Text style={{ color:'white' }}>
Go back
</Text>
</View>
</TouchableOpacity>
<Button title="Go back button" onPress = {() => console.log('Hello')}>
</Button>
</View>
);
}
}
export default RaceScreen
I've found that the Touchable components typically don't respond well to text children. You simply need to wrap it inside a View:
import React, {Component} from 'react';
import { View, Text, TouchableOpacity, Alert} from 'react-native';
export default class RaceScreen extends React.Component {
render() {
return (
<View style={{ flex: 1, alignItems: 'center', backgroundColor:'rgba(30,30,30,0.98)'}}>
<TouchableOpacity onPress = {() => console.log('Hello')}>
<View style={{ margin:50, height:100, width: 200, backgroundColor:'red', alignItems:'center', justifyContent:'center' }}>
<Text style={{ color:'white' }}>
Go back
</Text>
</View>
</TouchableOpacity>
</View>
);
}
}
I finally figured it out. In the createStackNavigator method from react-navigation, transparentCard:true is a deprecated property and was causing the bug. I was using version 3 documentation on a version 4 package of react navigation.
Looking at there site, they have just released version 5 which is great!
A note to the less experienced developers like myself, making sure you're aware of the version of each package you are using is critical for some of these difficult bugs. Don't let it get you down though, react native is elite!

bundling failed Unexpected token react native

I'm new at react native :D so..
I'm trying to build a simple page with inline style and when I use {{ like style={{}} return for me this error: Unexpected token and when I write like this style={} app run successfully but style not working
it's my code:
import React, { Component } from 'react';
import {
SafeAreaView,
StyleSheet,
ScrollView,
View,
Text,
Image,
StatusBar,
} from 'react-native';
import styles from "./outStyles";
class App extends Component {
render(){
return (
<View style={{flex=1}}>
<View style={{backgroundColor='#f00',flex=1}} ></View>
<View style={{backgroundColor='#00f',flex=9}} >
<Text>Usee First Project anbari</Text>
</View>
<View style={{backgroundColor='#00',flex=1}} ></View>
</View>
);
};
}
export default App;
The first set of curly braces in JSX indicates you are passing it a parameter. The second set in your example indicates that parameter is an object. But, your are not using valid JS object syntax. So instead of:
<View style={{backgroundColor='#f00',flex=1}} ></View>
Do this:
<View style={{ backgroundColor: '#f00', flex: 1 }} ></View>
It might be clearer for you if you separate your style object, like setting it up in your constructor:
this.styles = {
backgroundColor: '#f00',
flex: 1
};
Then in your render you could do:
<View style={this.styles} ></View>
When you pass the style to the <View>, tags are expecting style objects. So this is not going to work...
style={{ backgroundColor='#f00', flex=1 }}
It should be : not =, So this is how you should apply it...
style={{ backgroundColor:'#f00', flex:1 }}

React Native - Animate width shrink

In the header of my React Native app, I have a conditional icon and a Searchbar.
static navigationOptions = ({ navigation }) => {
const { params = {} } = navigation.state;
return {
headerTitle: (
<View
style={{
flex: 1,
backgroundColor: Platform.OS === 'ios' ? '#e54b4d' : '',
alignItems: 'center',
flexDirection: 'row',
paddingHorizontal: 10,
height: StatusBar.currentHeight,
}}>
{params.isIconTriggered && <Icon name="chevron-left" size={28} />}
<SearchBar
round
platform={'default'}
placeholder="Search"
containerStyle={{
flex: 1,
backgroundColor: 'transparent',
}}
/>
</View>
),
headerStyle: {
backgroundColor: '#e54b4d',
},
};
};
Normally the Searchbar will take the full width of the header which is what I want. If the condition isIconTriggered is true, an icon will appear in front of the Searchbar and the width of the SearchBar will shrink enough so that the icon is visible next to it.
However, there is no transition or animation when this happens and it does not feel nor look nice. I would like to add an animation to the Searchbar so the width shrinks gradually and smoothly when the condition is triggered and the icon appears.
Is that possible to achieve and how can I achieve this?
Try to learn Animated API of react native.
Here is how i done it with button trigger.
import React, {Component} from 'react';
import {StyleSheet, View, TextInput , Button, SafeAreaView, Animated} from 'react-native';
import FA from 'react-native-vector-icons/FontAwesome5'
const AnimatedIcon = Animated.createAnimatedComponent(FA)
// make your icon animatable using createAnimatedComponent method
export default class Application extends Component {
animVal = new Animated.Value(0);
// initialize animated value to use for animation, whereas initial value is zero
interpolateIcon = this.animVal.interpolate({inputRange:[0,1], outputRange:[0,1]})
interpolateBar = this.animVal.interpolate({inputRange:[0,1],outputRange:['100%','90%']})
// initialize interpolation to control the output value that will be passed on styles
// since we will animate both search bar and icon. we need to initialize both
// on icon we will animate the scale whereas outputRange starts at 0 end in 1
// on search bar we will animate width. whereas outputRange starts at 100% end in 90%
animatedTransition = Animated.spring(this.animVal,{toValue:1})
// we use spring to make the animation bouncy . and it will animate to Value 1
clickAnimate = () => {
this.animatedTransition.start()
}
// button trigger for animation
//Components that will use on Animation must be Animated eg. Animted.View
render() {
return (
<SafeAreaView>
<View style={styles.container}>
<View style={styles.search}>
{/* our icon */}
<Animated.View style={{width: this.interpolateBar}}>
<TextInput placeholder='search here' style={styles.input}/>
</Animated.View>
<AnimatedIcon name='search' size={28} style={{paddingLeft: 10,paddingRight:10, transform:[{scale: this.interpolateIcon}]}}/>
</View>
<Button title='animate icon' onPress={this.clickAnimate}/>
</View>
</SafeAreaView>
);
}
}
const styles = StyleSheet.create({
container: {
backgroundColor:'#F79D42',
// flex: 1,
height:'100%',
paddingTop:20,
flexDirection: 'column',
// justifyContent: 'center',
alignItems:'center'
},
input:{
width: '100%',
height:40,
backgroundColor:'gray',
textAlign:'center'
},
search:{
flexDirection:'row-reverse',
width:'90%',
height:40,
alignItems:'center'
}
});
Solution using react-native-elements SearchBar component.
Wrapped the SearchBar Component inside Animated.View.
to explicitly animate the search bar
Like This:
<Animated.View style={{width: this.interpolateBar}}>
<SearchBar
placeholder="Type Here..."
containerStyle={{width: '100%'}}
/>
</Animated.View>
You can achieve this using Animated API of React Native.
You can check this tutorial for an overview of changing the size of elements with animation.
React-Native-Animatable is super cool!
Try this one out:
Create A custom animation object
import * as Animatable from 'react-native-animatable';
Animatable.initializeRegistryWithDefinitions({
const myAnimation = {
from: {
width: 200
},
to: {
width: 100
}
}
})
Use is as Animation value within a view or as a reference within a function call.
Within a view:
<Animatable.View useNativeDriver animation={myAnimation}/>
As a reference variable:
<Animatable.View useNativeDriver ref={ref=>(this.testAnimation = ref)}/>
Method:
testMethod = () => {
this.testAnimation.myAnimation();
}

TabBarIOS in ReactNative not working, items overlapping each other

So im making an app and this is my code:
import React, { Component } from 'react';
import {
View,
Text,
TabBarIOS,
StyleSheet,
Dimensions
} from 'react-native';
//import Styles from './LayoutStyle.js';
class Layout extends Component {
constructor(){
super()
this.state = {selectedTab: 'tabThree'}
}
setTab(tabId){
this.setState({selectedTab: tabId})
}
render() {
return(<View style={Styles.Layout}>
<TabBarIOS>
<TabBarIOS.Item
systemIcon='history'
selected={this.state.selectedTab === 'tabOne'}
onPress={() => this.setTab('tabOne')}>
<View>
<Text>Jure1</Text>
</View>
</TabBarIOS.Item>
<TabBarIOS.Item
systemIcon='bookmarks'
selected={this.state.selectedTab === 'tabTwo'}
onPress={() => this.setTab('tabTwo')}>
<View>
<Text>Jure2</Text>
</View>
</TabBarIOS.Item>
<TabBarIOS.Item
systemIcon='more'
selected={this.state.selectedTab === 'tabThree'}
onPress={() => this.setTab('tabThree')}>
<View>
<Text>Jure3</Text>
</View>
</TabBarIOS.Item>
</TabBarIOS>
</View>
);
}
}
const Styles = StyleSheet.create({
Layout: {
alignItems: "center",
justifyContent: "center",
height: Dimensions.get('window').height,
width: Dimensions.get('window').width,
},
TabBar: {
backgroundColor: 'grey'
}
});
export default Layout;
Well what i expected was an app where you have a TabBar on the bottom with three different items to choose from and it should look like i would in a native ios app. Well thats not the case, what i get is this:
Well what should i do? How do i style this item to not overlap? Any ideas?
The layout style is causing the inner content to get centred oddly, change Layout style to this:
Layout: {
flex:1,
}
Additionally, when trying to draw a scene from the tab clicked you will want to use a render function inside the TabBarIOS.Item object, react native provides some good examples of how to do this in the documentation: https://facebook.github.io/react-native/docs/tabbarios.html
I would highly recommend placing a navigator for each object which allows you to have much more control over the scene changes:
<TabBarIOS.Item
systemIcon='history'
title= 'Jure1'
selected={this.state.selectedTab === 'tabOne'}
onPress={() => this.setTab('tabOne')}>
<View style = {{flex:1}}>
<Navigator
renderScene={this._renderScene}
/>
</View>
</TabBarIOS.Item>

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