I'm trying to make a basic tab application with React Navigation and so I have three pages with plain text. They centre vertically but not horizontally on the tabs. This is using alignContent and justifyContent in conjunction with each other (which has worked for me in the past).
At first I suspected the flex was only flexing vertically and so I applied a contrasting colour. However it seems to span the tab. I have also tried textAlign, but neither cases seem to work.
This is an example of one of the screens:
export class ExampleScreen extends Component {
render() {
return(
<View style={styles.container}>
<Text>Example!</Text>
</View>
)
}
}
And here is the StyleSheet:
export const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#FFF',
alignContent: 'center',
justifyContent: 'center'
}
})
There are no error messages. However I would expect the text to centre horizontally but all I get is this:
Your text is not horizontally center because Text is taking full width of the screen,
you need to center content inside Text
<Text style={{ textAlign: 'center' }}>Example!</Text>
Related
I want to put 3 texts on the screen one on the top, one on the middle an one on the bottom. For this I thought about using the space-around property. This is my code
<Screen style={styles.container} backgroundColor={color.transparent}>
<View style={styles.playerContainer}>
<View><Text>text 1</Text></View>
<View><Text>text 2</Text></View>
<View><Text>text 3</Text></View>
</View>
</Screen>
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: 'blue'
},
playerContainer:{
flexDirection: 'column',
justifyContent: 'space-around',
alignItems: 'center',
backgroundColor: 'red',
}
});
This is not working as expected. It looks better is I set a height for playerContainer, but I am enable to calculate the right hight because of the navigation bar etc.. I just need to add three text in the container. I must calculate the hight of playerContainer or I am doing something wrong?
If you want the first entry to be at the start of the container, the second to be at the center, and the last to be at the end, you need justifyContent: 'space-between'. I found this article helpful when learning about flex in React Native https://blog.reactnativecoach.com/understanding-flex-in-react-native-b34dfb4b16d1
I am having a lot of trouble working with a scroll view and flex dimensions. Basically the initial screen of the app should show a top side "banner" while the bottom is the "content".
The content is going to contain many "cards" that each contain information, and users will be able to scroll down to see the next card, and the next, and etc.
However, the flex property does not seem to be working at all, and I am not even able to create the proper sizes for the "banner" section and the "content" section.
This is my code:
import React, { Component } from 'react';
import {
StyleSheet,
Text,
View,
Image,
ScrollView,
TextInput
{ from 'react-native';
import RestaurantCard from './common/RestaurantCard';
export default class MemberArea extends Component<Props> {
constructor(props){
super(props);
this.state = {
searchText: ''
}
}
render() {
return (
<ScrollView contentContainerStyle = {styles.contentContainer}>
<View style={styles.banner}>
<TextInput style={styles.search}
underlineColorAndroid='rgba(0,0,0,0)'
placeholder="Search for Restaurants"
textAlign= 'center'
textAlignVertical='center'
returnKeyType="search"
/>
</View>
<Text style={styles.dropdown}>
{"What's nearby V"}
</Text>
<View style={styles.cards}>
<RestaurantCard />
</View>
</ScrollView>
);
}
}
const styles = StyleSheet.create({
contentContainer:{
flexGrow: 1,
flexDirection: 'column'
},
cards:{
flex:3,
backgroundColor:'#000000'
},
banner: {
flex:15,
backgroundColor: '#F36B45',
paddingBottom: 80
},
search:{
marginTop: 20,
paddingBottom: 5,
paddingTop: 5,
height: 30,
marginHorizontal: 40,
borderRadius: 20,
backgroundColor: 'rgb(255,255,255)'
},
dropdown:{
color: 'black',
fontWeight:'900',
fontSize:24,
margin:30
}
});
UPDATE: As seen in the comments below, I surrounded my scrollview with another view. I gave the Parent view Flex:1. The problem I run into now is as follows:
If I give the scrollview contentcontainerstyle flexGrow: 1, then the scrolling works as normal, but I cannot give the children sections of the scrollview space dimensions with flex values. However, if I give the scrollview flex:1 (rather than flexGrow), then I can give space dimensions to the children sections, but the scrolling function is disabled. Any help would be greatly appreciated!
Issue you have is you set content inside memberArea to grow according to the content but outside the memberArea, it's fixed. Add flex: 1 style to View in App.
<View style={{flex: 1}}> // App
Then you don't need to set contentContainerStyle for the ScrollView
Why do you set flex: 15? Check the doc first.
Here's the codesandbox
Read the React-Native Docs on Flexbox properly.
[https://facebook.github.io/react-native/docs/flexbox.html][1]
You cannot set Higher values to child Views of the Parent Views.
If you want to divide the Parent's Flex: 1, into 2 children - you can do Flex:0.5 and Flex:0.5 to the two children.
If you want every child to have their own space, assign Flex: 1 to each of them.
Check the Docs and other articles on it for more details.
Background
I have an image placed on a screen meant to show when the screen loads other content.
I want to center the image so it is always center on all devices.
Problem
Currently the image shows up top center. I would like it to be aligned vertically as well. Also to be sure that it will always look the same on all devices.
Question
What is the solution to make sure the image is always centered and the right size for all devices?
Example,
My current code,
In Photoshop
Image is 300 Resolution
Height is 776 px
Width is 600 px
I want the image to be centered horizontally and vertically in all devices and look good without pixelating. Natively I know I need to set the image sizes. But from my understanding in React Native I can use on image but then use JSX to handle it being responsive.
import React from 'react';
import {
StyleSheet,
View,
Image,
} from 'react-native';
const logo = require('../images/logo.jpg');
const LoadingScreen = () => (
<View>
<Image
style={styles.logo}
source={logo}
/>
</View>
);
const styles = StyleSheet.create({
logo: {
justifyContent: 'center',
alignItems: 'center',
width: 300,
height: 400,
},
});
export default LoadingScreen;
You need to set the style of <View> for justifyContent and alignItems for centering the <Image>.
Should be like this :
const LoadingScreen = () => (
<View style={styles.container}>
<Image
style={styles.logo}
source={logo}
/>
</View>
);
const styles = StyleSheet.create({
container: {
justifyContent: 'center',
alignItems: 'center',
},
logo: {
width: 300,
height: 400,
},
});
Or you can use alignSelf on the <Image> to make it center, but it will still need to add justifyContent on <View> to make it center vertically.
The View container should have styling as
flexDirection: 'column'
justifyContent: 'center'
alignItems: 'center'
height: '100%'
The height makes sure it spans throughout the page, thus making the image become both vertically and horizontally aligned.
For the image size, I think using percentage will do the trick instead of defining definite width/height.
Set in view:
justifycontent:center
And in child:
alignself:center
And perform in task.
Set in parent view:
justifycontent:center
And in child set:
alignself:center
I use the Navigator.NavigationBar component to make a navbar, but the text not vertical centering.
Like this:
How can I solve this?
I just ran into this issue too. The solution:
<Navigator.NavigationBar
routeMapper={{
Title: (route, navigator, index, navState) =>
{
return (
<View style={{
justifyContent: 'center',
flex: 1
}}>
<Text style={{color: 'white'}}>Candidates</Text>
</View>
);
},
}}
/>
So basically make sure there's a parent wrap on your navbar elements filling the navbars height (the flex: 1 rule) and vertically center its contents with justifyContent: 'center'.
I've done the styles inline for this example, but of course it'd be more efficient to get those from a StyleSheet object.
I am using the ToolbarAndroid where i need to center the Toolbars Title. I coudn´t figure out how this works. With the Styles properties it didn´t work.
This is my code:
<ToolbarAndroid
title={toolbarTitle(this.props.activeTab)}
titleColor='white'
style={styles.toolbar}
actions={toolbarActions(this.props.activeTab)}
onActionSelected={this._onActionSelected.bind(this)}>
</ToolbarAndroid>
Toolbar style:
toolbar: { height: 50, backgroundColor: 'grey' }
I can render the title properties and other properties depending on which Tab i am (using scrollable-tab-view) but changing the position where my title is placed didn´t work on my approach
You can add a custom view inside the toolbar
<ToolbarAndroid>
<View style={styles.title}>
<Text>Hi there</Text>
</View>
</ToolbarAndroid>
and center its text
var styles = StyleSheet.create({
title: {
flex: 1,
alignItems: 'center',
justifyContent: 'center',
marginRight: 28
}
});
A margin was needed to get alignment right.
In some cases I've seen that it was necessary to set an extra style property like backgroundColor for the alignment to work.
By design guidelines toolbar title is aligned to the left. There are some hacky ways to do this in java, but it is probably impossible in react native.
If you don't mind android design guidelines I advise you to use custom component instead of ToolbarAndroid.