React native react-native-scrollable-tab-view ScrollableTab 默认不显示指示器问题

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在初始化过后可能会出现此问题，解决方案参考一位 GitHub 的 Issues

需要修改ScrollableTabBar源码：
将this.updateView({value: this.props.scrollValue._value, });
替换为：
this.updateView({value: this.props.scrollValue.__getValue(), });

   measureTab(page, event) {
     const { x, width, height, } = event.nativeEvent.layout;
     this._tabsMeasurements[page] = {left: x, right: x + width, width, height, };
-    this.updateView({value: this.props.scrollValue._value, });
+    this.updateView({value: this.props.scrollValue.__getValue(), });
   },

   render() {
@@ -209,12 +209,12 @@ const ScrollableTabBar = React.createClass({
       width = WINDOW_WIDTH;
     }
     this.setState({ _containerWidth: width, });
-    this.updateView({value: this.props.scrollValue._value, });
+    this.updateView({value: this.props.scrollValue.__getValue(), });
   },

   onContainerLayout(e) {
     this._containerMeasurements = e.nativeEvent.layout;
-    this.updateView({value: this.props.scrollValue._value, });
+    this.updateView({value: this.props.scrollValue.__getValue(), });
   },
 });

链接：https://github.com/skv-headless/react-native-scrollable-tab-view/commit/4312d6cca2fe7859caa5219f2ee8b61edcf04884