August Flanagan 0f7477f9f9 add flag to enable momentum scrolling on iOS
Summary:
Expose a `decelerationNormalEnabled` flag on WebView, which, when enabled, will WebView's ScrollView's `decelerationRate` to `UIScrollViewDecelerationRateNormal`. This gives the WebView the same "momentum" style scrolling as other iOS views.

This was discussed with ide in #5447. Please let me know if there's anything I'm missing, or anything else you'd like to see in this pull request.
Closes https://github.com/facebook/react-native/pull/5527

Reviewed By: svcscm

Differential Revision: D2870312

Pulled By: nicklockwood

fb-gh-sync-id: 7dbfd06a349e3365a5df40c3bacf25a4fdb306cf
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UIExplorer

The UIExplorer is a sample app that showcases React Native views and modules.

Running this app

Before running the app, make sure you ran:

git clone https://github.com/facebook/react-native.git
cd react-native
npm install

Running on iOS

Mac OS and Xcode are required.

  • Open Examples/UIExplorer/UIExplorer.xcodeproj in Xcode
  • Hit the Run button

See Running on device if you want to use a physical device.

Running on Android

You'll need to have all the prerequisites (SDK, NDK) for Building React Native installed.

Start an Android emulator (Genymotion is recommended).

cd react-native
./gradlew :Examples:UIExplorer:android:app:installDebug
./packager/packager.sh

Note: Building for the first time can take a while.

Open the UIExplorer app in your emulator.

See Running on Device in case you want to use a physical device.

Built from source

Building the app on both iOS and Android means building the React Native framework from source. This way you're running the latest native and JS code the way you see it in your clone of the github repo.

This is different from apps created using react-native init which have a dependency on a specific version of React Native JS and native code, declared in a package.json file (and build.gradle for Android apps).