How to catch the number of the page that i'm in? ViewPager React Native

I'm using ViewPager by react-native-community to scroll down my page, but I'm having trouble when catching the page that the user is in, in the API there is a showPageIndicator: boolean but only for IOS, i figure we can catch the number in the IOS by this bool there is some way i can catch the number.

https://github.com/react-native-community/react-native-viewpager

<ViewPager            initialPage={0}            orientation="horizontal"            scrollEnabled            onPageSelected={changePage}>