Steffen Matthischke 048a9ab10c RCTScrollEvent: get all required values injected rather than accessing the scroll view
Summary:
This PR fixes #15006 by removing all UI API calls from RCTScrollEvent.

`-[RCTScrollEvent arguments]` can now be called from a background thread.
The Main Thread Checker of Xcode 9 will not any longer produce runtime issues when calling this method.

1. create a React Native (version: this PR) project with a scroll view
2. open it in Xcode 9
3. launch it
4. scroll the scroll view
5. observe the runtime issues in Xcode. There should not contain "UI API called from background thread"-issues.

I verified my changes on this branch: https://github.com/HeEAaD/Demo-ReactNative-UI-not-on-main-thread/tree/fix

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Closes https://github.com/facebook/react-native/pull/15008

Differential Revision: D5424734

Pulled By: shergin

fbshipit-source-id: 56beec2d7603ea6782d55622567509f3758a4517
2017-07-14 21:03:53 -07:00
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