bug fix： http://jira.yoho.cn:8888/browse/YH-2680 ， 代码优化 ，review by 盖剑秋

@@ -221,23 +221,20 @@ export default class Home extends React.Component {
                         onPressLike={this.props.onPressLike}
                     />
 				);
+            default:
+                return null;
 		}
     }
 
     _renderSectionHeader(sectionData, sectionID) {
         switch (sectionID) {
-            case 'progressing':
-			case 'banner':
-			case 'notice':
-			case 'section':
-                return null;
-
 			case 'recommendation':
 				return (
                     <View style={styles.sectionHeader}>
                         <Image style={styles.sectionHeaderImg} source={require('../../images/home/hot.png')}/>
                         <Text style={styles.sectionHeaderText}>热门推荐</Text>
-                        <View style={styles.sectionHeaderLine}/>
+                        <View style={styles.sectionHeaderTopLine}/>
+                        <View style={styles.sectionHeaderBottomLine}/>
                     </View>
 				);
 
@@ -323,8 +320,8 @@ let styles = StyleSheet.create({
         height: 32,
         alignItems: 'center',
         backgroundColor: 'white',
-        borderTopWidth: 0.5,
-        borderTopColor: '#e0e0e0',
+        // borderTopWidth: 0.5,         // borderTopWidth 在iPhone 6P上显示有bug
+        // borderTopColor: '#e0e0e0',
     },
     sectionHeaderImg: {
         width: 9,
@@ -335,7 +332,15 @@ let styles = StyleSheet.create({
         fontSize: 12,
         marginLeft: 5,
     },
-    sectionHeaderLine: {
+    sectionHeaderTopLine: {
+        position: 'absolute',
+        left: 0,
+        top: 0,
+        width: width,
+        height: 0.5,
+        backgroundColor: '#e0e0e0',
+    },
+    sectionHeaderBottomLine: {
         position: 'absolute',
         left: 17,
         bottom: 0,

@@ -211,6 +211,8 @@ export default class Section extends React.Component {
                         />
                     </ScrollableTabView>
 				);
+            default:
+                return null;
 		}
     }