change text size according to screen react native

1import { Dimensions, Platform, PixelRatio } from 'react-native';
2
3const {
4       width: SCREEN_WIDTH,
5       height: SCREEN_HEIGHT,
6     } = Dimensions.get('window');
7
8     // based on iphone 5s's scale
9     const scale = SCREEN_WIDTH / 320   ;
10
11  export function actuatedNormalize(size) {
12  const newSize = size * scale 
13   if (Platform.OS === 'ios') {
14    return Math.round(PixelRatio.roundToNearestPixel(newSize))
15   } else {
16     return Math.round(PixelRatio.roundToNearestPixel(newSize)) - 2
17   }
18  }

1<View>
2  <Text
3    numberOfLines={1}
4    adjustsFontSizeToFit
5    style={{textAlign:'center',fontSize:30}}
6  >
7    {this.props.email}
8  </Text>
9</View>