Develop Reference

React Native : Add a band of color in the background

I would like to add a band of grey in the midddle of my white background. Here is the issue : I can't write anything inside of it. Here is my code : container: { flex: 1, justifyContent: "center", marginTop: 12, flexDirection: "column", }, upperContainer: { flex: 1, backgroundColor: "#fff", }, lowerContainer: { flex: 1, top: 1400, backgroundColor: "#F7F7F7", }
<ScrollView style={{ flex: 1 }} contentContainerStyle={{ flexGrow: 1 }}>
<View style={styles.container}>
<View style={styles.upperContainer}>
...
<View style={styles.lowerContainer}>
...

I'm not sure what you're going for with the ScrollView, but here's one way to do it on a static background:
<View style={{ flex: 1, backgroundColor: '#fff', justifyContent: 'center' }}>
<View style={{ backgroundColor: '#bbb', width: '100%', paddingVertical: 12 }}>
<Text style={{ textAlign: 'center' }}>
Gray Stripe Text
</Text>
</View>
</View >
Keys are:
flex: 1 and justifyContent: 'center' in outer View
nesting elements so they are contained
You could probably also do the gray background without the inner View, by adding background color straight to the Text.

React native - Adapt horizontal ScrollView's height to its children

See the following snack
I need to adapt the height of the ScrollView to its children. It seems that ScrollView is using { flex: 1 } by default (not sure). Any ideas how to make it possible?
<View style={{ flex: 1 }}>
<ScrollView horizontal style={{ backgroundColor: 'red' }}>
<View
style={{ width: 60, height: 30, marginLeft: 5, backgroundColor: 'lime' }}
/>
</ScrollView>
<View style={{ flex: 1, backgroundColor: 'yellow' }} />
</View>
Thank you.
Note: Is it possible to do it without using { height: 30 } ?

Wrapping the ScrollView inside a View does the trick.
<View style={{ flex: 1 }}>
<View>
<ScrollView horizontal style={{ backgroundColor:"red" }}>
<View style={{ width: 60, height: 30, marginLeft: 5, backgroundColor: "lime" }} />
</ScrollView>
</View>
<View style={{ flex: 1, backgroundColor:"yellow" }} />
</View>

Flexbox - React Native

i am new to react native and i am trying to make a chat app layout.
As you can see in screenshot that i have attached, i want text box to take as much space as the text in it. For example, if i send 'Hi', it should only be stretched as much space 'Hi' needs.
If i send a long text, then it should stretch and take as much space as that text is. Like it happens in almost all texting apps.
The text box code is:
<TouchableOpacity>
<View style={styles.containerSent}>
<View style={{flex: 3}}>
<Text style={styles.message}>{item.message}</Text>
</View>
<View style={{flex: 1}}>
<Image
source={require('../assets/images/check.png')}
style={styles.image}
/>
<Text style={{textAlign: 'right', color: 'white'}}>
{msToTime(item.timestamp)}
</Text>
</View>
</View>
</TouchableOpacity>
Stylesheet
containerSent: {
flex: 1,
maxWidth: '70%',
// minWidth: '30%',
marginTop: 20,
paddingTop: 20,
paddingHorizontal: 10,
paddingBottom: 10,
borderWidth: 1,
backgroundColor: '#6F2232',
borderRadius: 20,
alignSelf: 'flex-end',
flexDirection: 'row',
justifyContent: 'space-between',
// justifyContent: 'flex-end',
},
message: {
color: 'white',
fontSize: 15,
fontWeight: 'bold',
textAlign: 'left',
alignSelf: 'stretch',
},
image: {
width: 15,
height: 15,
marginLeft: 20,
marginBottom: 5,
alignSelf: 'flex-end',
},

How I have implemented this is that I removed flex: 3 and flex: 1 from both the elements so that they don't expand to take the max space, and I added flexShrink: 1 to the text, so that it always shrinks keeping the right element intact.
Snack link

Set View style to flex: 0 so it‘s just taken as Maus h space as necessary.
<TouchableOpacity>
<View style={styles.containerSent}>
<View style={{ flex: 0 }}>
<Text style={styles.message}>{'q.a'}</Text>
</View>
<View style={{ flex: 0, paddingLeft: 10 }}>
<Text style={styles.message}>{'eeeee.message'}</Text>
</View>
</View>
</TouchableOpacity>
Take a look at my sample

Display Vertical text in react native like drawer

I need to display text in vertical position. the text will be dynamic so it can be short or long. i've added the screenshot of what i want. can anybody share the code for this type of ui. thanks in advance.
Like this
see this, this is what i got
<View>
<View style={{}}>
<View
style={{ marginTop: 30, flexDirection: "row", justifyContent: "center" }}
>
<Text
style={{
textAlign: "center",
fontSize: 20,
alignSelf: "center",
transform: [{ rotate: "90deg" }],
color: "white",
fontWeight: "bold",
}}
>
Short
</Text>
</View>
</View>
<View style={{}}>
<View
style={{ marginTop: 30, flexDirection: "row", justifyContent: "center" }}
>
<Text
style={{
textAlign: "center",
fontSize: 20,
alignSelf: "center",
transform: [{ rotate: "90deg" }],
color: "white",
fontWeight: "bold",
}}
>
Long Text
</Text>
</View>
</View>
</View>;

You're going to be in trouble if you try to apply the transformations one by one in all <Text />. Instead try to apply the transformations in a parent <View /> which gives you more control of what is going on.
const App = () => {
const {width: screenWidth, height: screenHeight} = Dimensions.get('window');
const height = 80;
return (
<View
style={{
transform: [
{rotate: '-90deg'}, // negative degrees is important for this calculations and have the text face the content as your desired result picture shows
{translateX: -(screenHeight / 2)}, // rotation is being applied in the center so it's safe to move it half screen
{translateX: height / 2}, // correct the x translation with half of our component height so it stays on screen
{translateY: -screenWidth}, // rotation is being applied in the center so it's safe to move it full screen width
{translateY: height / 2}, // correct the y translation with half of our component height so it stays on screen
],
width: screenHeight, // swap screen width with screen height so the background covers the entirety of the screen
height, // fixed height is important to apply corrections on transform you could also use a ref and get this size on runtime
flexDirection: 'row',
justifyContent: 'center',
alignItems: 'center',
backgroundColor: 'green',
}}>
<Text
style={{
fontSize: 20,
color: 'white',
fontWeight: 'bold',
margin: 10,
}}>
Short
</Text>
<Text
style={{
fontSize: 20,
color: 'white',
fontWeight: 'bold',
margin: 10,
}}>
Long Text
</Text>
<Text
style={{
fontSize: 20,
color: 'white',
fontWeight: 'bold',
margin: 10,
}}>
Very Long Long Text
</Text>
</View>
);
};
You can check the result here.

React Native: Absolute positioned image higher than parent

I have a View-Element that contains an image, which works as a background-image for the View-Element. The background-image is absolute positioned with top, left, right and bottom set to 0 but it is still higher then it's parent (you can see it on the red border in the image).
Screenshot from iOS Simulator
Does anyone know why?
<View style={styles.headerContainer}>
<Image source={Images.headerBg} style={styles.headerBackgroundImage} resizeMode="cover" />
<View style={styles.headerRow}>
<View style={styles.headerColumn}>
<TouchableOpacity style={styles.magicHeartButton}>
<Icon
name="heart"
size={12}
color="red"
style={styles.magicHeartButtonIcon}
/>
<Text style={styles.magicHeartButtonText}>247</Text>
</TouchableOpacity>
</View>
<View style={styles.headerColumn}>
<TouchableOpacity style={styles.tonightButton}>
<Text style={styles.tonightButtonText}>right column</Text>
</TouchableOpacity>
</View>
</View>
</View>
The Stylesheet:
headerContainer: {
backgroundColor: '#ffd700',
height: 40,
position: 'relative',
borderWidth: 1,
borderColor: 'red',
},
headerRow: {
justifyContent: 'space-between',
flexDirection: 'row',
alignItems: 'center',
},
headerColumn: {
padding: 10,
},
headerBackgroundImage: {
position: 'absolute',
top: 0,
left: 0,
right: 0,
bottom: 0,
},

I did background image in following way. Instead of wrapping in <View>, I wrapped everything in <Image>
Example:
<Image source = {require('./back.jpg')} style={styles.container}>
<View>
</View>
</Image>
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: 'rgba(0,0,0,0)',
height :null,
width: null
},