Support RTL for Progress.Bar (#171)

Author: matinzd

Bar.js

@@ -1,6 +1,6 @@
 import React, { Component } from 'react';
 import PropTypes from 'prop-types';
-import { Animated, Easing, View } from 'react-native';
+import { Animated, Easing, View, I18nManager } from 'react-native';
 
 const INDETERMINATE_WIDTH_FACTOR = 0.3;
 const BAR_WIDTH_ZERO_POSITION =
@@ -152,7 +152,7 @@ export default class ProgressBar extends Component {
         {
           translateX: this.state.progress.interpolate({
             inputRange: [0, 1],
-            outputRange: [innerWidth / -2, 0],
+            outputRange: [innerWidth / (I18nManager.isRTL ? 2 : -2), 0],
           }),
         },
         {
@@ -176,4 +176,4 @@ export default class ProgressBar extends Component {
       </View>
     );
   }
-}
+}