react native listview 一个有用的属性，用作两列布局

contentContainerStyle：设置listview包裹内容的属性

<ListView

                    contentContainerStyle={{flexDirection:'row',flexWrap:'wrap'}}

                    style={{flex: 1}}

                    initialListSize={1}

                    dataSource={dataSource}

                    renderRow={this.renderProduct}

                    onEndReached={this.onEndReached.bind(this,dataState)}

                    onEndReachedThreshold={10}

                    renderFooter={this.renderFooter.bind(this,dataState)}

                    refreshControl={

                  <RefreshControl

                    refreshing={dataState.isRefreshing}

                    onRefresh={this.onRefresh.bind(this)}

                    title="加载中..."

                    colors={COLOR_REFRESH_CONTROL}

                  />

                }

                />