fix: remove runtime warning by replacing UIManager.RCTVideo with `U…

…IManager.getViewManagerConfig('RCTVideo')` (and ensuring backwards compat) (#1487)

* replaced UIManager.RCTVideo >  UIManager.getViewManagerConfig('RCTVideo')

* added requested changes

* updated changelog.md

* docs: adjust wording

.eslintrc

@@ -1,4 +1,4 @@
 {
   "extends": "airbnb",
   "parser": "babel-eslint"
-}
+}

CHANGELOG.md

@@ -1,7 +1,7 @@
 ## Changelog
 
 ### next
-
+* Fix runtime warning by replacing `UIManager.RCTVideo` with `UIManager.getViewManagerConfig('RCTVideo')` (and ensuring backwards compat) [#1487](https://github.com/react-native-community/react-native-video/pull/1487)
 * Fix loading package resolved videos when using video-caching [#1438](https://github.com/react-native-community/react-native-video/pull/1438)
 * Fix "message sent to deallocated instance" crash on ios [#1482](https://github.com/react-native-community/react-native-video/pull/1482)
 

Video.js

@@ -210,6 +210,13 @@ export default class Video extends Component {
     }
   };
 
+  getViewManagerConfig = viewManagerName => {
+    if (!UIManager.getViewManagerConfig) {
+      return UIManager[viewManagerName];
+    }
+    return UIManager.getViewManagerConfig(viewManagerName);
+  };
+
   render() {
     const resizeMode = this.props.resizeMode;
     const source = resolveAssetSource(this.props.source) || {};
@@ -224,14 +231,16 @@ export default class Video extends Component {
     const isAsset = !!(uri && uri.match(/^(assets-library|ipod-library|file|content|ms-appx|ms-appdata):/));
 
     let nativeResizeMode;
+    const RCTVideoInstance = this.getViewManagerConfig('RCTVideo');
+
     if (resizeMode === VideoResizeMode.stretch) {
-      nativeResizeMode = NativeModules.UIManager.RCTVideo.Constants.ScaleToFill;
+      nativeResizeMode = RCTVideoInstance.Constants.ScaleToFill;
     } else if (resizeMode === VideoResizeMode.contain) {
-      nativeResizeMode = NativeModules.UIManager.RCTVideo.Constants.ScaleAspectFit;
+      nativeResizeMode = RCTVideoInstance.Constants.ScaleAspectFit;
     } else if (resizeMode === VideoResizeMode.cover) {
-      nativeResizeMode = NativeModules.UIManager.RCTVideo.Constants.ScaleAspectFill;
+      nativeResizeMode = RCTVideoInstance.Constants.ScaleAspectFill;
     } else {
-      nativeResizeMode = NativeModules.UIManager.RCTVideo.Constants.ScaleNone;
+      nativeResizeMode = RCTVideoInstance.Constants.ScaleNone;
     }
 
     const nativeProps = Object.assign({}, this.props);