"The <Image> component cannot contain children " in React Native, Possible fix ? - javascript

Day 1 with React-Native . Trying to load multiple images in a React-Native app. However, the app crashes with the error:
Error: The component cannot contain children. If you want to
render content on top of the image, consider using the
<ImageBackground> component or absolute positioning.
I tried solutions to these existing questions, however they failed to resolve my issue:
How to use ImageBackground to set background image for screen in react-native.
Tile component issues with latest react 0.50.0 #709
Also tried replacing <ImageBackground> with <Image>, however that did not resolve the issue as well.
Here's the code to my App.js :
import React, { Component } from 'react';
import {
StyleSheet,
View,
Image
} from 'react-native';
const playIcon = require('./images/play.png');
const volumeIcon = require('./images/sound.png');
const hdIcon = require('./images/hd-sign.png');
const fullScreenIcon = require('./images/full-screen.png');
const remoteImage = { uri:'https://s3.amazonaws.com/crysfel/public/book/new-york.jpg' };
export default class App extends Component<{}> {
render() {
return (
<Image source={remoteImage} style={styles.fullscreen}>
<View style={styles.container}>
<Image source={playIcon} style={styles.icon} />
<Image source={volumeIcon} style={styles.icon} />
<View style={styles.progress}>
<View style={styles.progressBar} />
</View>
<Image source={hdIcon} style={styles.icon} />
<Image source={fullScreenIcon} style={styles.icon} />
</View>
</Image>
);
}
}
const styles = StyleSheet.create({
fullscreen: {
flex: 1,
},
container: {
position: 'absolute',
backgroundColor: '#202020',
borderRadius: 5,
flexDirection: 'row',
height: 50,
padding: 5,
paddingTop: 16,
bottom: 30,
right: 10,
left: 10,
borderWidth: 1,
borderColor: '#303030',
},
icon: {
tintColor: '#fff',
height: 16,
width: 16,
marginLeft: 5,
marginRight: 5,
},
progress: {
backgroundColor: '#000',
borderRadius: 7,
flex: 1,
height: 14,
margin: 10,
marginTop: 2,
},
progressBar: {
backgroundColor: '#bf161c',
borderRadius: 5,
height: 10,
margin: 2,
width: 80,
},
});
What is possibly causing this issue and how to resolve it?

<Image> with nested content is no longer supported. Use <ImageBackground> instead.
<View style={styles}>
<ImageBackground style={styles} source={source} resizeMode={resizeMode} >
{children}
</ImageBackground>
{...}
</View>
Also you need to add a parent component (View) to wrap all your components.

It's not work because you must wrap all your components with parent View.
Image cannot be the parent view.
something like this:
render() {
return (
<View>
<Image source={remoteImage} style={styles.fullscreen}>
<View style={styles.container}>
<Image source={playIcon} style={styles.icon} />
<Image source={volumeIcon} style={styles.icon} />
<View style={styles.progress}>
<View style={styles.progressBar} />
</View>
<Image source={hdIcon} style={styles.icon} />
<Image source={fullScreenIcon} style={styles.icon} />
</View>
</Image>
</View>
);
}

Related

React native KeyboardAvoidingView not moving correctly

I have a TextInput that when pressed gets covered by the keyboard. So I wrapped it in a KeyboardAvoidingView. But regardless of the behavior that I set for this view, the TextInput won't move above the keyboard. Using position as the behavior moves the TextInput but only half way above the keyboard, while the other two don't seem to work at all.
I also tried wrapping my entire component with a KeyboardAvoidingView, but doing so breaks the entire layout.
Can anyone help me? I never managed to get KeyboardAvoidingView to work for me and now I really need it. Thanks in advance!
Here is my component. Also worth mentioning is that this component is top level(well, almost top level since it's wrapped in a Router)
const { height, width } = Dimensions.get('screen')
const style = StyleSheet.create({
main: {
height,
width,
flexDirection: 'column',
},
iconSelecter: {
width,
height: 196,
alignItems: 'center',
justifyContent: 'center',
backgroundColor: Colors.primary,
marginTop: 32
},
icon: {
height: 164,
width: 164,
},
saveButton: {
width: 96,
height: 96,
borderRadius: 100,
backgroundColor: Colors.secondary,
alignItems: "center",
justifyContent: "center",
alignSelf: 'center',
position: 'absolute',
bottom: 96 + 32
},
saveIcon: {
height: 54,
width: 54,
},
textInputWrapper: {
borderBottomColor: Colors.textInputBorder,
width: 288,
borderBottomWidth: 1,
alignSelf: 'center',
marginTop: 96,
height: 48,
},
textInput: {
fontWeight: "300",
fontSize: 14,
margin: 0
},
hintWrapper: {
alignSelf: 'center',
marginTop: 4
},
hint: {
fontSize: 12,
fontFamily: "Roboto-Thin",
fontStyle: 'normal',
}
})
const CreateActivity = ({ goBack }: NavigationProps) => {
//////////////////////////////
//State and logic
///////////////
return (
// TODO: Add touchable opacity to dismiss keyboard
<View style={style.main}>
<Appbar title="New activity" canGoBack goBack={goBack} />
<View style={{ flex: 1 }}>
<View style={style.iconSelecter}>
<GestureRecognizer onSwipeLeft={nextIcon} onSwipeRight={lastIcon}>
<Image style={style.icon} source={icons[currentIconIndex]?.file}></Image>
</GestureRecognizer>
</View>
<View style={style.hintWrapper}>
<Text style={style.hint}>Swipe to cycle through the icons</Text>
</View>
<KeyboardAvoidingView>
<View style={style.textInputWrapper}>
<TextInput style={style.textInput} placeholder={"Give this activity a name"} value={name} onChangeText={setName}></TextInput>
</View>
</KeyboardAvoidingView>
<TouchableNativeFeedback onPress={createActivity} background={TouchableNativeFeedback.Ripple("#fff", true)}>
<View style={style.saveButton}>
<Image style={style.saveIcon} source={require("../../assets/icons/light/save.png")}></Image>
</View>
</TouchableNativeFeedback>
</View>
</View>
)
}
export default CreateActivity;
I suggest that you to try wrap all the content of the screen in <KeyboardAvoidingView /> (or make it one of the outermost elements), otherwise it only will slide up its children (the View and the TextInput) leaving the rest of the content in its original position, making the layout look overlaped and weird. If you do that, the value "position" should work fine.
Something like this:
<View style={style.main}>
<Appbar title="New activity" canGoBack goBack={goBack} />
<KeyboardAvoidingView behavior="position" >
<View style={{ flex: 1 }}> // --> Remove flex: 1 if you experience some issue with the positioning
<View style={style.iconSelecter}>
<GestureRecognizer onSwipeLeft={nextIcon} onSwipeRight={lastIcon}>
<Image style={style.icon} source={icons[currentIconIndex]?.file}></Image>
</GestureRecognizer>
</View>
<View style={style.hintWrapper}>
<Text style={style.hint}>Swipe to cycle through the icons</Text>
</View>
<KeyboardAvoidingView>
<View style={style.textInputWrapper}>
<TextInput style={style.textInput} placeholder={"Give this activity a name"} value={name} onChangeText={setName}></TextInput>
</View>
</KeyboardAvoidingView>
<TouchableNativeFeedback onPress={createActivity} background={TouchableNativeFeedback.Ripple("#fff", true)}>
<View style={style.saveButton}>
<Image style={style.saveIcon} source={require("../../assets/icons/light/save.png")}></Image>
</View>
</TouchableNativeFeedback>
</View>
</KeyboardAvoidingView>
</View>
Also see the comment in the code above. Check if you really need to use of flex: 1 in all the outer wrapper elements, and take a look to the height you are setting in the style.main based on dimentions. I don't think that it is necesary and I think it could lead to some measure issues if you fix the height of the parent container.
EDIT:
I was just digging in react-native docs and I realize that there is a zIndex that you could use to avoid ablsolute positioning. It is a relative style prop so it needs to be set between sibling views, like this:
export default class MyComponent extends React.Component {
render() {
return (
<View>
<View style={[styles.appbarShape, styles.appbarZIndex]} ><Text>Header</Text></View>
<KeyboardAvoidingView behavior="position" style={styles.contentZIndex}>
{other children}
<TextInput placeholder="enter text"/>
</KeyboardAvoidingView>
</View>
);
}
}
const styles = StyleSheet.create({
appbarShape: {
height: 80,
width: Dimensions.get('window').width,
justifyContent: 'center',
alignSelf: "stretch",
backgroundColor: "#FFF"
},
appbarZIndex: {
zIndex: 3,
},
contentZIndex: {
zIndex: 0
}
});
Since the view that represents the appbar has a greater zIndex it shows up over the ones with a lower zIndex
Check this out working in this snack https://snack.expo.io/5VXAcw4Y0
Docs: https://reactnative.dev/docs/layout-props
Hope it helps!
Use react-native-keyboard-aware-scroll-view
<KeyboardAwareScrollView extraHeight={135} enabledOnAndroid={true}
extraScrollHeight={70} style={styles.mainContainer}
automaticallyAdjustContentInsets={true}
enableOnAndroid={true}
keyboardShouldPersistTaps='handled'
scrollEnabled={true} >
//your form
</KeyboardAwareScrollView>
const styles = StyleSheet.create({
mainContainer: { flex: 1, marginHorizontal: 15, marginVertical: 15 },
});

How to place floating action button in bottom right in React Native

I am trying to place a floating action button in the lower right corner of my app but it is placing it in the top left way off screen.
Returned view:
<View>
<View style={{flexDirection: 'row'}}>
<TouchableOpacity onPress={this.onPress} activeOpacity={.5} >
<Image
source={require('./assets/images/hamburger.png')}
style={{ width: 30, height: 25, marginLeft: 15}}
/>
</TouchableOpacity>
</View>
<FloatingAction style={styles.bottom}/>
</View>
Styles:
const styles = StyleSheet.create({
bottom: {
flex: 1,
position: 'absolute',
bottom: 10,
right:10
},
});
My current view displays a header and a bottom tab view. I am able to place multiple FAB's in each tab screen but that produces an undesirable behavior. Thank you for any help.
Edit:
What I have:
What I want:
Your issue was on adding { flex: 1, position: 'absolute',} to the button style together. The parent component that covers all the phone screen would use flex: 1, your button component is the one that receives the style for the position.
Always creating a new component makes stuff easier to read and understand. So let's say you have a button component (<FloatingButton/>), you would do something like this:
import React from 'react';
import { Text, View, StyleSheet } from 'react-native';
import FloatingButton from './FloatingButton';
export default class App extends React.Component {
render() {
return (
<View style={styles.container}>
<Text>
I'm just a Text
</Text>
<FloatingButton
style={styles.floatinBtn}
onPress={() => alert(`I'm being clicked!`)}
/>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
},
floatinBtn: {
position: 'absolute',
bottom: 10,
right: 10,
}
});
You will get this result:
This is the button component:
import React from 'react';
import { View, TouchableOpacity } from 'react-native';
export default props => (
<TouchableOpacity onPress={props.onPress} style={props.style}>
<View
style={{
backgroundColor: 'blue',
width: 45,
height: 45,
borderRadius: 45,
}}
/>
</TouchableOpacity>
);
Check the snack demo: https://snack.expo.io/#abranhe/floating-btn
// this should occupy the whole screen
<View style={{flex:1}}>
<View style={{flexDirection: 'row'}}>
<TouchableOpacity onPress={this.onPress} activeOpacity={.5} >
<Image
source={require('./assets/images/hamburger.png')}
style={{ width: 30, height: 25, marginLeft: 15}}
/>
</TouchableOpacity>
</View>
<FloatingAction style={styles.bottom}/>
</View>
const styles = StyleSheet.create({
bottom: {
position: 'absolute',
bottom: 10,
right:10
},
});
Just use that CSS in your code:
.floating-btn {
position:fixed;
bottom:10;
right: 10;
}
That's it

How to make this grid with logo header at the top?

I am a newbie to react native, I want to make this layout possible I have following code but it puts the logo inside grid
What I am looking for is this
import React, { Component } from 'react';
import GridView from 'react-native-super-grid';
export default class ProfileScreen extends Component {
static navigationOptions = {
title: 'Details',
};
render() {
const { navigate } = this.props.navigation;
const items = [
{ name: require('./images/shopping-cart.png'),code: '#2ecc71' }, { name: require('./images/home.png'), code: '#2ecc71' },
{ name: require('./images/money-bag.png'), code: '#2ecc71' }, { name: require('./images/alert.png'), code: '#2ecc71' }
];
return (
<ImageBackground
source={require('./images/marble.jpg')}
style={styles.backgroundImage}>
<View style={styles.mainLayout}>
<Image resizeMode={'cover'} style = {styles.logoFit} source={require('./images/Logo1.png')}/>
<GridView
itemDimension={130}
items={items}
style={styles.gridView}
renderItem={item => (
<View style={styles.itemContainer}>
<View style={styles.CircleShapeView}>
<Image style={styles.iconItem} source={item.name}/>
</View>
</View>
)}
/>
</View>
</ImageBackground>
);
}
}
const dimensions = Dimensions.get('window');
const imageHeight = Math.round(dimensions.width * 9 / 16);
const imageWidth = dimensions.width;
const styles = StyleSheet.create({
backgroundImage: {
flex: 1,
resizeMode: 'cover', // or 'stretch'
},
CircleShapeView: {
width: 100,
height: 100,
borderRadius: 100,
backgroundColor: '#00BCD4',
justifyContent: 'center',
alignItems: 'center'
},
gridView: {
paddingTop: 50,
flex: 1,
},
itemContainer: {
justifyContent: 'center',
alignItems:'center',
height:130
},
iconItem: {
alignItems:'center',
justifyContent: 'center'
},
logoFit: {
width: imageHeight,
height: imageWidth
},
mainLayout: {
flex: 1,
flexDirection: 'column',
justifyContent: 'space-between'
}
});
Get rid of that grid component. You don't need it for such a simple thing. It's complicating things, and as it's not a regular/common component we don't know how it's affecting things.
This looks quite simple:
<View>
<View style={{}}>
<Image />
</View>
<View style={{flexDirection:'row'}}>
<View>
<Text>row 1, col 1</Text>
</View>
<View>
<Text>row 1, col2Text>
</View>
</View>
<View style={{flexDirection:'row'}}>
<View>
<Text>row 2, col 1</Text>
</View>
<View>
<Text>row 2, col2Text>
</View>
</View>
<View style={{}}>
<Button title="Login" />
</View>
</View>
Here's another similar question - How to create 3x3 grid menu in react native without 3rd party lib?
Inside navigationOptions You should remove the title property and define a header property and put your Image there. Like this
static navigationOptions = {
header:(<Image resizeMode={'cover'} style = {styles.logoFit} source={require('./images/Logo1.png')}/>)
};
Or... YOu can just make the header null as
static navigationOptions = {
header:null
};
and your current code would work as you want it to be.

Pressing a button doesn't load gui

Problem:
So I am programming an app using a custom font, and I coded it so when you press a button the font will load. When you press the button that says "Press me to load after 15 seconds!" a user input box should appear along with some empty posts, some text and another button (that doesn't do anything yet) but nothing shows up. I don't get any errors. I would like help figuring out why nothing is showing up and how I can get the proper stuff to render.
How it works:
When you press the button "press me to load the app after 15 seconds!" the variable fontLoaded should change to true (I don't know if it actually changes), and then that would cause the code to render everything else to start. Nothing renders.
What else have I tried:
I've tried the other method where you put the variable fontLoaded after the code that loads the font so it's automatic, and that doesn't do anything either. I haven't tried anything else, because I don't know what else to try.
Code:
import React, { Component } from 'react';
import { StyleSheet, Text, View, Image, TextInput, ScrollView, TouchableHighlight, Button } from 'react-native';
import { Font } from 'expo';
var fontLoaded = false;
export default class App extends React.Component {
state = {
fontLoaded: false,
};
componentDidMount() {
Expo.Font.loadAsync({
'Cabin-Regular-TTF': require('./Cabin-Regular-TTF.ttf'),
});
}
constructor(props) {
super(props);
this.state = { postInput: ""}
}
render() {
return (
<View style={styles.container}>
<View style={styles.container}>
<View style={{width: 1, height: 30, backgroundColor: '#e8e8e8'}} />
<Button
onPress={() => this.setState({ fontLoaded: true })}
title="Press Me To Load the App After 15 Seconds!"
color="#fe8200"
accessibilityLabel="Wait 15 seconds and then press me to load the font!"
/>
</View>
{fontLoaded ? (
<View style={styles.container}>
<Text style={{ fontFamily: 'Cabin-Regular-TTF', fontSize: 16 }}>
Whats on your mind? Create a post!
</Text>
<TextInput>
style={{height:40, width: 320, borderColor: '#303030', borderWidth: 1}}
onChangeText={(postInput)=>this.setState({postInput})}
value={this.state.postInput}
</TextInput>
<Button
title="+"
color="#fe8200"
accessibilityLabel="Wait 15 seconds and then press me to load the font!"
/>
<ScrollView>
<View style={{width: 1, height: 6, backgroundColor: '#e8e8e8'}} />
<View style={{width: 300, height: 250, backgroundColor: '#1daff1'}} />
<View style={{width: 300, height: 40, backgroundColor: '#147aa8'}} />
<View style={{width: 1, height: 6, backgroundColor: '#e8e8e8'}} />
<View style={{width: 300, height: 250, backgroundColor: '#1daff1'}} />
<View style={{width: 300, height: 40, backgroundColor: '#147aa8'}} />
<View style={{width: 1, height: 6, backgroundColor: '#e8e8e8'}} />
</ScrollView>
</View>) : (null) }
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#e8e8e8',
alignItems: 'center',
justifyContent: 'center'
},
});
You should put this.state.fontLoaded in the return of the render method, you are using the global variable fontLoaded which did not change. Hope this helps!

React Native : View does not bound to the right

I've been dabbling with some react native code and found that my view does not have a right boundary in both android and iOS renders. So when I add a horizontal margin, the view displays margin only on the left like this.
I am also attaching my code and styles to guide me on where I would have gone wrong.
Login.js
import React,{Component} from 'react';
import {View,ToolbarAndroid,Text, Image, StatusBar,TextInput, TouchableOpacity} from 'react-native';
import styles from './styles.js'
class LogIn extends Component {
constructor(props) {
super(props)
this.state = {hostName: '', userName: '', password: ''}
}
onButtonPress() {
this.props.onSubmit && this.props.onSubmit(this.state);
}
render() {
return(
<Image style={styles.container} source={images.background}>
<StatusBar backgroundColor="#00EF6C00" translucent={true}/>
<View style={styles.logocontainer}>
<FitImage source={images.logo} resizeMode="contain" resizeMethod="scale" style= {{width: 300,position: 'absolute', left: 50, height: 100}}/>
</View>
<View style={styles.comp_container}>
<TextInput placeholder="Host Name" style={{height: 40}} onChangeText={(text) => this.setState({hostName: text})}/>
<TextInput placeholder="User Name" style={{height: 40}} onChangeText={(text) => this.setState({userName: text})}/>
<TextInput placeholder="Password" style={{height: 40}} onChangeText={(text) => this.setState({password: text})}/>
<TouchableOpacity onPress={this.onButtonPress.bind(this)} style={{height: 40, flex: 1, flexDirection: 'row'}}>
<Text style={{flex: 1}}> Submit </Text>
</TouchableOpacity>
</View>
</Image>
)
}
}
LogIn.propTypes = {
onSubmit: React.PropTypes.func,
}
export default LogIn;
Also Please find the attached stylesheet for further information on style
import { StyleSheet } from 'react-native'
const styles = StyleSheet.create({
container: {
flex: 1,
flexDirection: 'column'
},
toolbar: {
backgroundColor: '#EF6C00',
height: 56,
elevation: 3,
},
textInput: {
borderRadius: 20,
borderColor: "#FFFFFF",
height: 40,
},
button: {
height: 40,
},
logocontainer: {
flex: 1,
flexDirection: 'column',
alignItems: 'stretch',
justifyContent: 'center',
},
comp_container: {
flex: 2,
flexDirection: 'column',
justifyContent: 'center',
marginHorizontal: 16,
}
});
export default styles
Edit: It is almost palpable that the problem should be with react-native unable to decide where the view boundary is. So instead of wrapping within the view, it decides to extent it. I also would love to get to know of any tools which can help me debug the UI issues, like the uiautomationviewer for android.
You do not specify width nor resizeMode in background image so it overflows screen. By default alignItems is stretch, TouchableOpacity fills container on horizontal and also overflows screen.

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