Summary:
Revamps the Switch API with the goal of increasing the pit of success:
- Introduce `trackColor` which encourages callers configuring the color to set colors for both cases.
- Introduce `ios_backgroundColor` which allows customizing the iOS-only background fill color.
- Deprecate `tintColor` because it is not obvious that this is for the `false` case.
- Deprecate `onTintColor` because the prop is named unconventionally like a callback.
- Renamed `thumbTintColor` to `thumbColor`.
This revision also cleans up the `Switch` component in the following ways:
- More precise Flow types for native components.
- Inline iOS-specific style (so that the code gets stripped on Android).
- Minor documentaiton cleanup.
After this commit, all deprecated props will continue working.
Next, I plan to introduce warnings.
Eventually (e.g. in a couple releases), we can drop support for the deprecated props.
Reviewed By: TheSavior
Differential Revision: D9081343
fbshipit-source-id: c5eb949047dd7a0ffa72621839999d38e58cada8
965adee109