React-Native: Mask image with a bottom radius

Question

How do I make the border bottom radius in an image?

And how can I mask the image to the green area?

I've tried the following codes, but I can't get the radius ratio in the image I've shared above

View Code:

<View style={styles.wrapper}>
    <View style={styles.welcomeWrapper}>
        <View style={styles.welcomeImageWrapper}>
            <Image style={{width:'100%'}} source={require('../assets/images/test-slide.jpg')}/>
        </View>
    </View>
    <View style={{
        height: 100,
        backgroundColor: colors.white,
        justifyContent: 'flex-end',
        alignItems: 'center'
    }}>
       <Text style={{marginBottom:50,fontSize:18,fontFamily:'Montserrat-Regular'}}>Deneme Text </Text>
    </View>
</View>

Style Code:

wrapper:{
    flex:1,
    display: 'flex',
    backgroundColor:colors.white,
},
welcomeWrapper:{
    flex:1,
    justifyContent:'center',   
    backgroundColor:colors.green01,
    overflow: 'hidden',
    position:'relative',
    width:'100%',
    borderBottomRightRadius:Dimensions.get('window').width/100*50,
    borderBottomLeftRadius:Dimensions.get('window').width/100*50,
},

Answer 1

Seeing the shape of your image mask, I think you should use something like react-native-svg to create a real image mask.

Steps:

1. Set the background image in a View with a position: absolute, so that your image is always in the background and can be masked

2. Add react-native-svg to your project, for instance with yarn add react-native-svg, and link the library using react-native link. Finally, re-launch the metro bundler and compile your app (run-android or run-ios).

3. Design the svg mask (I used inkscape) and add it to the container's View, the mask should have the same backgroundColor as your text container.

4. A bit of styling using react's flexbox layout to be able to have almost the same look on every device. In this example, the mask takes 5/6 of the screen height as my mask flex number is 5 and my text flex is 1

So, this is what I ended up with:

import * as React from 'react';
import { Dimensions, Image, StyleSheet, Text, View } from 'react-native';
import { Path, Svg } from 'react-native-svg';

const mask = {
  width: Dimensions.get('window').width,
  height: 50,
  bgColor: '#ecf0f1',
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'flex-end',
  },
  image: {
    position: 'absolute',
  },
  mask: {
    flex: 5,
    justifyContent: 'flex-end',
  },
  textContainer: {
    flex: 1,
    width: '100%',
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: mask.bgColor,
  },
  text: {
    fontSize: 50,
    textAlign: 'center',
  }
});

const App = () => (
  <View style={styles.container}>
    <Image style={styles.image} source={require('./assets/image.jpg')} />
    <View style={styles.mask}>
      <Svg width={mask.width} height={mask.height}>
        <Path
          fill={mask.bgColor}
          d={`M 0 0 L 0 ${mask.height} L ${mask.width} ${mask.height} L ${mask.width} 0 A ${mask.width / 2} ${mask.height / 2} 0 0 1 ${mask.width / 2} ${mask.height / 2} A ${mask.width / 2} ${mask.height / 2} 0 0 1 0 0 z `} />
      </Svg>
    </View>
    <View style={styles.textContainer}>
      <Text style={styles.text}>Text</Text>
    </View>
  </View>
);

export default App;

And here is the result in an Android emulator

Hope this helps!

Link to snack: https://snack.expo.io/BJlZgpuB7 (but my image does not load on snack :( )