could it possible that ViewPager do not need to set a style with a specific height?

# Question
the example in `readme` provide a `style={{ flex: 1 }}` to `ViewPager`(like bellow),and it occupy all screen height; but in my case, the pager's height is not specific，it depends; but without a specific height, `ViewPager` show nothing

so, could the height of `ViewPager` be flexible ?
```
import React from 'react';
import {StyleSheet, View, Text} from 'react-native';
import ViewPager from '@react-native-community/viewpager';

const MyPager = () => {
return (


First page


Second page


);
};

const styles = StyleSheet.create({
viewPager: {
flex: 1,
},
});
```

The issue points to the README ViewPager example but names no implementation file or test. Start by reproducing the example with a content-dependent parent height and inspect the ViewPager layout behavior. Done means establishing whether flexible height is supported and documenting or verifying the resulting behavior.

Written by the indexing model from the issue text.