[iOS] Setting UIRefreshControl state for ScrollView #5042
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Currently by setting onRefreshStart callback prop on ScrollView, the user can pull to trigger the refreshing state of the UIRefreshControl, but there's no way to do this programmatically.
This PR add a prop refreshing like PullToRefreshViewAndroid to control the refreshing state. In addition, the endRefreshing callback passed to onRefreshStart is no longer necessary
since it could be stopped by setting refreshing={false}.
I am also wondering if it's possible to provide a unified API to control the refreshing state of ScrollView on both iOS and Android, i.e. by using prop refreshing and callback prop onRefreshStart. The implementation on Android could be wrapping the ScrollView automatically into a SwipeRefreshLayout thus developers don't need to use or care about PullToRefreshViewAndroid (and its underlying SwipeRefreshLayout) in most cases.