修复index不准的问题。 reviewed by 凯总。

@@ -53,7 +53,7 @@ export default class Brand extends Component {
         if (item) {
            if (!item.y) {
                this.needScrollSection = sectionID;
-               item.y = ScrollY(sectionID,this.sectionData);
+               item.y = ScrollCount(sectionID,this.sectionData);
                this.props.setBrandData && this.props.setBrandData(this.sectionDataKey, this.props.selectedChannelId);
                this.listView && this.listView.scrollTo({x: 0, y: item.y, animated: false});
            } else {

@@ -4,6 +4,7 @@ import React from 'react';
 import ReactNative from 'react-native';
 import {isEmptyObject} from '../../utils/Utils';
 import Immutable, {Map} from 'immutable';
+import * as _ from 'lodash';
 
 const {
     View,
@@ -19,6 +20,10 @@ export default class IndexListView extends React.Component {
     constructor(props) {
         super (props);
         this.onTouchMove = this.onTouchMove.bind(this);
+
+        this.state = {
+            list:[]
+        };
     }
 
     shouldComponentUpdate(nextProps){
@@ -31,16 +36,26 @@ export default class IndexListView extends React.Component {
 
     onTouchMove(e) {
         let {dataSource} = this.props;
-        let Y =  e.nativeEvent.pageY - Math.ceil((viewHeight - dataSource.length * (itemHeight+2))/2) - 8-28;
-        var index = Math.ceil(Y/(itemHeight+2))-1;
-        if (dataSource.length - index < 4) {
-            return;
+        let Y =  e.nativeEvent.pageY;
+        for (var i = 0; i < this.state.list.length; i++) {
+            if (Y > this.state.list[i].y && Y < this.state.list[i].y + 12) {
+                let name = this.state.list[i].name;
+                if (name == '0') {
+    				name = '0-9';
+    			}
+                console.log(name);
+                this.props.onLetterPress && this.props.onLetterPress(i,name);
+                break;
+            }
         }
-        let sectionID = dataSource[index];
-        if (!sectionID) {
-            return;
     }
-        this.props.onLetterPress && this.props.onLetterPress(index,sectionID);
+
+    onLayout(name,e) {
+        let {y} = e.nativeEvent.layout;
+        let Y = {'name':name,'y':y}
+        let list = this.state.list;
+        list.push(Y);
+        this.setState(list)
     }
 
     render() {
@@ -58,7 +73,9 @@ export default class IndexListView extends React.Component {
             if (name == '0-9') {
 				name = '0';
 			}
-            keyData.push(<Text key={i} style={styles.text}>{name}</Text>);
+
+
+            keyData.push(<View key={i} style={styles.TV} onLayout={this.onLayout.bind(this, name)}><Text style={styles.text}>{name}</Text></View>);
         }
 
         return (
@@ -71,7 +88,7 @@ export default class IndexListView extends React.Component {
 
 let {width, height} = Dimensions.get('window');
 let itemHeight = 12;
-let viewHeight = height - 112;
+let viewHeight = height - 64;
 
 let styles = StyleSheet.create({
     container: {
@@ -80,17 +97,24 @@ let styles = StyleSheet.create({
         height: viewHeight,
 		bottom : 1,
 		right: 1,
-		backgroundColor: 'rgba(255,255,255,0.2)',
+		backgroundColor: 'red',
         alignItems: 'center',
 		justifyContent: 'center',
     },
+    TV: {
+        width: 12,
+        height: 12,
+        backgroundColor: 'transparent',
+        marginTop: 2,
+        justifyContent: 'center',
+    },
 	text: {
 		justifyContent: 'center',
 		textAlign: 'center',
 		fontSize: 11,
 		color: 'black',
 		backgroundColor: 'transparent',
-        marginTop: 2,
+
         fontWeight: 'bold',
 	},
     image: {