Merge pull request #539 from flyskywhy/patch-1

Fix `Uncaught TypeError: _this.refs.scrollView.scrollTo is not a function`

Author: Bart Arribe

src/index.js

@@ -269,7 +269,7 @@ export default class extends Component {
   loopJump = () => {
     if (!this.state.loopJump) return
     const i = this.state.index + (this.props.loop ? 1 : 0)
-    const scrollView = this.refs.scrollView
+    const scrollView = this.scrollView
     this.loopJumpTimer = setTimeout(() => scrollView.setPageWithoutAnimation &&
       scrollView.setPageWithoutAnimation(i), 50)
   }
@@ -425,10 +425,10 @@ export default class extends Component {
     if (state.dir === 'x') x = diff * state.width
     if (state.dir === 'y') y = diff * state.height
 
-    if (Platform.OS === 'android') {
-      this.refs.scrollView && this.refs.scrollView[animated ? 'setPage' : 'setPageWithoutAnimation'](diff)
+    if (Platform.OS !== 'ios') {
+      this.scrollView && this.scrollView[animated ? 'setPage' : 'setPageWithoutAnimation'](diff)
     } else {
-      this.refs.scrollView && this.refs.scrollView.scrollTo({ x, y, animated })
+      this.scrollView && this.scrollView.scrollTo({ x, y, animated })
     }
 
     // update scroll state
@@ -438,7 +438,7 @@ export default class extends Component {
     })
 
     // trigger onScrollEnd manually in android
-    if (!animated || Platform.OS === 'android') {
+    if (!animated || Platform.OS !== 'ios') {
       setImmediate(() => {
         this.onScrollEnd({
           nativeEvent: {
@@ -579,10 +579,14 @@ export default class extends Component {
     )
   }
 
+  refScrollView = view => {
+    this.scrollView = view;
+  }
+
   renderScrollView = pages => {
     if (Platform.OS === 'ios') {
       return (
-        <ScrollView ref='scrollView'
+        <ScrollView ref={this.refScrollView}
           {...this.props}
           {...this.scrollViewPropOverrides()}
           contentContainerStyle={[styles.wrapperIOS, this.props.style]}
@@ -595,7 +599,7 @@ export default class extends Component {
        )
     }
     return (
-      <ViewPagerAndroid ref='scrollView'
+      <ViewPagerAndroid ref={this.refScrollView}
         {...this.props}
         initialPage={this.props.loop ? this.state.index + 1 : this.state.index}
         onPageSelected={this.onScrollEnd}