Curved bottom on View

Here is the result. I used Dimensions (const window = Dimensions.get('window');) here to make it more dynamic to different screen sizes.

const styles = StyleSheet.create({
containerStyle: {
    alignSelf: 'center',
    width: window.width,
    overflow: 'hidden',
    height: window.width / 1.7
},
sliderContainerStyle: {
    borderRadius: window.width,
    width: window.width * 2,
    height: window.width * 2,
    marginLeft: -(window.width / 2),
    position: 'absolute',
    bottom: 0,
    overflow: 'hidden'
},
slider: {
    height: window.width / 1.7,
    width: window.width,
    position: 'absolute',
    bottom: 0,
    marginLeft: window.width / 2,
    backgroundColor: '#9DD6EB'
}});


render() {
  return(
    <View style={styles.containerStyle} >
      <View style={styles.sliderContainerStyle} >
        <Slider/>
      </View>
    </View>
  );
}

I don't know whether this is a proper way or not. However this works for me and hope this will help someone.

<View style={styles.parent}>
     <View style={styles.child}>
         <Text>Hello World</Text>
     </View>
</View>

Insert your code to child View

const styles = StyleSheet.create({
    parent : {
        height : '80%',
        width : '100%',
        transform : [ { scaleX : 2 } ],
        borderBottomStartRadius : 200,
        borderBottomEndRadius : 200,
        overflow : 'hidden',
    },
    child : {
        flex : 1,
        transform : [ { scaleX : 0.5 } ],

        backgroundColor : 'yellow',
        alignItems : 'center',
        justifyContent : 'center'
    }
})

I ended up with using react-native-svg.:

<Circle
  cx={screenWidth / 2}
  cy={`-${898 - headerHeight + 2}`}
  r="898.5"
  fill="#EFF2F3"
  stroke="#C5CACD"
  strokeWidth="2"
/>