Summary:
The necessity of this feature was removed in 2017. To intercept React Native gesture recognizer, implement UIGestureRecognizer delegate for conflicting gestures.
Here is the quote from the internal note:
> Previously we had lots of super weird bugs where React Native would inaccurately recognize touch gestures which were meant to be addressed by the native environment. Usually, these bugs occurred as unintentional taps happening right after swipe gestures. In all of these cases, we had to manually call method `cancelTouches` as part of an external gesture recognition process which prevented touch delivery to React Native. Furthermore, we had to delay touch delivery to React Native to wait for these cancellations. That code always looked like a hack (in the bad meaning of this word), like in some random place something dispatch event to another random place where something finally calls `cancelTouches`, yak. It was super annoying because it required adding this hack to all existing apps and screens, and because sometimes it was even too late to cancel touches.
> We fixed that. Instead of delaying touch delivery and waiting for calls to `cancelTouches`, we set up the React Native gesture recognizer in such way that it always agrees to fail in favor of any native gestures (from non-RN-based and served views which are placed higher in a hierarchy). React Native will now cancel all active touches itself so that we no longer need to call `cancelTouches` manually. We already removed all these calls and supported code from Facebook and Instagram.
See also: https://github.com/facebook/react-native/pull/25193
Reviewed By: PeteTheHeat
Differential Revision: D15734129
fbshipit-source-id: 289f77a437cb40199c591153b5801d24d0c10d1e
Valentin Shergin
36307d87e1