React Native scrollview stops scrolling after screen change - react-native

I have a ScrollView in react native where the functionality stops working only after I change the screen. For example: when I reload and land on the home screen (with the ScrollView) it all works fine. but when I use the bottom tab navigator to change the screen and return back to the home screen, it doesn't work anymore.
Thanks in advance for the help!
const Home = () => {
return (
<SafeAreaView style={{ flex: 1, backgroundColor: COLORS.background }}>
<Header screenName="home" />
<View style={{ color: COLORS.secondary, flex: 14, paddingHorizontal: SIZES.width / 20}}>
<ScrollView
showsVerticalScrollIndicator={false}
>
<Text style={styles.popularHeader}>Title</Text>
<ScrollView
horizontal={true}
showsHorizontalScrollIndicator={false}
style={styles.popular}
>
<View style={styles.popularItem}>
<Text>Name</Text>
</View>
<View style={styles.popularItem}>
<Text>Name</Text>
</View>
<View style={styles.popularItem}>
<Text>Name</Text>
</View>
<View style={styles.popularItem}>
<Text>Name</Text>
</View>
</ScrollView>
<View style={styles.event}>
<Text style={styles.eventTitle}>event title</Text>
<Text style={styles.eventDate}>date</Text>
</View>
</ScrollView>
</View>
</SafeAreaView>
)
}
const styles = StyleSheet.create({
popularHeader: {
color: COLORS.text,
fontSize: SIZES.h4,
alignSelf: 'center',
marginBottom: 10
},
popular: {
borderBottomWidth: 1,
paddingBottom: SIZES.height / 30,
marginBottom: SIZES.height / 30,
borderBottomColor: COLORS.secondary
},
popularItem: {
width: 100,
height: 100,
borderRadius: 5,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: COLORS.text,
marginRight: 10,
},
event:{
height: SIZES.height / 3,
backgroundColor: COLORS.text,
borderRadius: 5,
marginBottom: SIZES.height / 30,
padding: 10
},
eventTitle: {
fontSize: SIZES.h3,
alignSelf: 'center'
},
eventDate: {
fontSize: SIZES.h6,
alignSelf: 'center'
}
})

In case someone wonders, after a three-day-long search I found out the problem was with the bottomTabNavigator not unmounting the screens after a change of screen. so the solution that fixed my problem is:
in screenOptions:
unmountOnBlur: true

Related

react-native custom header navigator has unwanted margins

I have drawer and stack navigator. I disabled header of drawer and stack navigators. And create my own header component but I cannot rid of the edge margins of my custom header component.
[Screenshot]
https://i.stack.imgur.com/5jWv3.png
const styles = StyleSheet.create({
header: {
backgroundColor: 'purple',
width: '100%',
height: '100%',
flexDirection: 'row',
alignItems: 'center',
},
headerText: {
fontWeight: 'bold',
fontSize: 21,
letterSpacing: 1,
paddingLeft: 45,
paddingBottom: 2,
},
icon: {
fontSize: 30,
color:"white",
position: 'absolute',
zIndex: 3,
}});
 
return (
<View style={styles.header}>
<View style={styles.header}>
<MaterialIcons style={styles.icon} name="menu" onPress={openMenu}/>
<Text style={styles.headerText}>{titleName}</Text>
</View>
</View>
)
This is your header Component. Have you checked if the Main Container does not have a paddingHorizontal in the Screen?
Solution #1
Change:
return (
<View style={styles.header}>
<View style={styles.header}>
<MaterialIcons style={styles.icon} name="menu" onPress={openMenu}/>
<Text style={styles.headerText}>{titleName}</Text>
</View>
</View>
)
to:
return (
<View style={styles.header}>
<MaterialIcons style={styles.icon} name="menu" onPress={openMenu}/>
<Text style={styles.headerText}>{titleName}</Text>
</View>
)
Solution #2
import {Dimensions} from 'react-native'
let width=Dimensions.get('screen').width
let height=Dimensions.get('screen').height
then:
const styles = StyleSheet.create({
header: {
backgroundColor: 'purple',
width: width,
height: height,
flexDirection: 'row',
alignItems: 'center',
},
})
I fixed the issue with opening the app on web to see styles of parent the element. In this case my parent element is the <Stack.screen> home tab.
I just checked the styles on web which is
marginLeft: 16,
marginRight: 16,
maxWidth: 470,
and override these styles with
marginLeft: 0,
marginRight: 0,
maxWidth: '100%',
screenshot of the solution result
<Stack.screen
options={{headerBackgroundContainerStyle: {
marginLeft: 0,
marginRight: 0,
maxWidth: '100%'
}
}}
/>

Touchables in react native

I am trying to add some space in the middle of two touchable components wrapped in a view
How do i go about doing that, I will include my style sheet
return (
<>enter code here
<View style={styles.container}>
<View style={styles.scrollContainer}>
<ScrollView
horizontal
pagingEnabled
showsHorizontalScrollIndicator={false}
>
{images.map((image) => (
<Image key={image} style={styles.image} source={image} />
))}
</ScrollView>
</View>
<View style={styles.btn}>
`enter code here`<LinearGradient
colors={["#0A5640", "#0A5640"]}
style={{ alignItems: "center", borderRadius: 10 }}
>
<TouchableOpacity onPress={() => navigation.navigate("SignIn")}>
<Text style={styles.btnAuth}>Sign In</Text>
</TouchableOpacity>
</LinearGradient>
<LinearGradient
colors={["#FFC72A", "#FFC72A"]}
style={{ alignItems: "center", borderRadius: 10 }}
>
<TouchableOpacity
onPress={() => navigation.navigate("CreateAccount")}
>
<Text style={styles.btnAuth}>Sign Up</Text>
</TouchableOpacity>
</LinearGradient>
</View>
</View>
</>
);
};
const styles = StyleSheet.create({
container: {
backgroundColor: "#0A5640",
},
scrollContainer: {
height: "100%",
},
image: {
width,
height: "100%",
},
btnAuth: {
fontSize: 18,
fontWeight: "bold",
paddingHorizontal: 60,
paddingVertical: 10,
color: "#fff",
marginLeft: 10,
},
btn: {
color: "#fff",
marginTop: 70,
flexDirection: "row",
alignItems: "center",
justifyContent: "space-around",
alignContent: "space-between",
zIndex: 200,
paddingRight: 10,
paddingLeft: 10,
bottom: 3,
position: "absolute",
},
});
Did you mean the space between SignIn and SignUp button? You can use flex or width to define the touchableOpacity width. Is this something that you tried to achieve?
import * as React from 'react';
import {Text,View,StyleSheet,TouchableOpacity,}from 'react-native';
export default function App() { return (
<View style={styles.container}>
<View style={styles.btn}>
<TouchableOpacity style={styles.btnAuth}>
<Text style={{color:'#000', fontSize:18}}>Sign In</Text>
</TouchableOpacity>
<TouchableOpacity style={styles.btnAuth}>
<Text style={{color:'#000', fontSize:18}}>Sign Up</Text>
</TouchableOpacity>
</View>
</View> ); }
const styles = StyleSheet.create({ container: { backgroundColor: '#0A5640', flex:1 }, btnAuth: {
padding: 20,
width : '45%',
alignItems:'center',
backgroundColor:'yellow' }, btn: {
color: '#fff',
width: '100%',
flexDirection: 'row',
alignItems: 'center',
justifyContent: 'space-around',
bottom: 3,
position: 'absolute', }, });

Adding margin to component changes screen layout react-native

I'm building a react-native app and I'm having a problem styling the components.
For some reason when I add a margin to one of the components the main component doesn't occupy the full height of the screen even though is "flex:1".
In this example the problem happens with the back button, if I use padding it works fine but I need to use margin so the user doesn't press the wrong component by mistake.
And the same problem happens in the rest of the app with different components that have a margin property.
Main component
body: {
flex: 1,
backgroundColor: 'green'
},
subHeader: {
backgroundColor: '#f4f4f4',
height: 95,
flexDirection: 'row'
},
vericalBar: {
width: 9
},
subHeaderDescription: {
flex: 1,
justifyContent: 'center',
marginLeft: 16
},
subHeaderLocation: {
color: '#2d2d2d',
fontSize: 14,
marginBottom: 10
},
subHeaderText: {
color: '#2d2d2d',
fontSize: 20
},
subHeaderStatus: {
alignItems: 'center',
justifyContent: 'center',
marginRight: 18
},
listDescription: {
backgroundColor: 'red',
flexGrow: 1,
paddingTop: 16,
paddingLeft: 20
},
taskDescription: {
color: '#2d2d2d',
fontSize: 16
}
<View style={localStyles.body}>
<Header navigation={this.props.navigation} />
<View style={localStyles.subHeader}>
<View style={[localStyles.vericalBar, { backgroundColor: task.color }]} />
<View style={localStyles.subHeaderDescription}>
<Text style={localStyles.subHeaderLocation}>{location.name}</Text>
<Text style={localStyles.subHeaderText}>{task.name}</Text>
</View>
{iconSelector(task)}
</View>
<BackButton navigation={this.props.navigation} />
<View style={localStyles.listDescription}>
<Text style={localStyles.taskDescription}>{task.description}</Text>
</View>
{returnStatus(task)}
<ReportIssueButton navigation={this.props.navigation} />
<Footer navigation={this.props.navigation} />
</View>
Back Button
<TouchableWithoutFeedback onPress={() => navigation.goBack()}>
<View style={localSytles.container}>
<Image style={{ width: 14, height: 14 }} source={require('../../Images/Back.png')} />
<Text style={localSytles.buttonText}>Back</Text>
</View>
</TouchableWithoutFeedback>
container: {
flexDirection: 'row',
height: 40,
paddingLeft: 20,
alignItems: 'center',
backgroundColor: 'blue'
},
buttonText: {
color: '#2d2d2d',
fontSize: 14,
marginLeft: 10
}
I've found the problem, the container "listDescription" had a "paddingTop: 16"
by removing that property it allowed the container to push the rest of the containers down.

Custom Component not appearing

I made a custom bottom Navbar for my React-Native App which I want to stick at the bottom of the screen.
This is what it looks like
<View style={styles.NavBarBottom}>
<TouchableOpacity
onPress={() => this.activeTab("home")}>
<Text> <Icon name="bitcoin" size={30} color={ this.state.activeTab == "home" ? "#fbc02d" : "white"} /></Text>
</TouchableOpacity>
<TouchableOpacity
onPress={() => this.activeTab("News")}>
<Text> <Icons name="news" size={30} color={this.state.activeTab == "News" ? "#fbc02d" : "white"} /> </Text>
</TouchableOpacity>
</View>
where Styles are this
const styles = StyleSheet.create({
NavBarBottom : {
paddingTop: 8,
borderTopWidth: 2,
backgroundColor: "#005cb2",
display: "flex",
flexDirection: "row",
justifyContent: "space-around",
padding: 5,
}
})
Now this successfully works and show in case of Home Screen but on another screen when I import it, It appears only when the content is loading and afterwards it doesn't appear (attaching the GIF for the same in end). Also on the page where I am just passing the props, it doesn't appear
The code for other page would be
<View>
<Header
navigation = {this.props.navigation}
enable = "true" />
<ScrollView>
<View style={listOfCurrencies}>
{ CurrencyDisplay.map(data =>
<TouchableOpacity>
<View style={IndvidualCurrencyMain}>
<Text style={dataLong}> {data["long"]}</Text>
<Text style={dataShort}>{data["short"]}</Text>
</View>
</TouchableOpacity>)}
</View>
</ScrollView>
<BottomNavigation />
</View>
With Styles like this
const styles = StyleSheet.create({
listOfCurrencies: {
display: "flex",
flexDirection: "column",
marginBottom: 60
},
IndvidualCurrencyMain: {
backgroundColor: "white",
display: "flex",
flexDirection: "row",
height: 80,
alignItems: "center",
height: 50,
borderRadius: 10,
marginLeft: 3,
marginRight: 3,
marginTop: 5,
marginBottom: 5
},
dataLong:{
marginLeft: 3,
width: 150
},
dataShort: {
marginLeft: "48%",
marginRight: 5
},
index: {
marginLeft: 2,
width: 20
}
})
Any idea why it won't be appearing?
You can try this just by adding the main view flex:1 style

ViewPagerAndroid doesnt show children

I copied straight from the documentation here:
<View style={styles.container}>
<Text style={styles.welcome}>
Welcome to React Native!
</Text>
<Text style={styles.instructions}>
To get started, edit App.js
</Text>
<Text style={styles.instructions}>
{instructions}
</Text>
<View style={styles.main}>
<ViewPagerAndroid style={styles.viewPager} initialPage={0}>
<View style={styles.pageStyle}>
<Text>First page</Text>
</View>
<View style={styles.pageStyle}>
<Text>Second page</Text>
</View>
</ViewPagerAndroid>
</View>
</View>
And my stylesheet:
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
instructions: {
textAlign: 'center',
color: '#333333',
marginBottom: 5,
},
main: {
backgroundColor: 'pink',
height: 300
},
viewPager: {
height: 100,
backgroundColor: 'skyblue'
},
pageStyle: {
padding: 20,
width: 100,
height: 100,
backgroundColor: 'green',
flex: 1
}
});
All is the pink and skyblue rectangles. I have no idea why the child is not rendering. Does anyone have any ideas?