[Improvement Opinion] Move onIndexChanged from UNSAFE_componentWillUpdate to componentDidUpdate

[ovistoica]

Which OS ?

Mac Mojave

Version

Which versions are you using:

• react-native-swiper 1.6.0-rc.3
• react-native v0.61.2

Improvement Proposal

This is not an issue per say, but I am wondering, wouldn't it be safer for further react & react native releases to move onIndexChanged from UNSAFE_componentWillUpdate to componentDidUpdate? At the moment, onIndexChanged is the only function used there and most likely, this is going to cause crashes on the next react release