MaskedViewIOS

import React from 'react';
import { MaskedView, Text, View } from 'react-native';

class MyMaskedView extends React.Component {
  render() {
    return (
      <MaskedView
        style={{ flex: 1 }}
        maskElement={
          <View style={styles.maskContainerStyle}>
            <Text style={styles.maskTextStyle}>
              Basic Mask
            </Text>
          </View>
        }
      >
        <View style={{ flex: 1, backgroundColor: 'blue' }} />
      </MaskedView>
    );
  }
}