React Native ListView的Item设置点击事件时null is not an object

先贴下代码:

<ListView 
                    contentContainerStyle = {styles.list}
                    pageSize={2}
                    dataSource = {this.state.dataSource}
                    renderRow={this._renderRow}
                />

_renderRow(rowData) {
        console.log('rowData.url:　'+ rowData.url) ;
        console.log('rowData.name:　'+ rowData.name) ;
        return (
            <TouchableOpacity onPress = {() =>this._pressRow(rowData.url)} underlayColor = "transparent" >
            <View>
            <View style={styles.row}>
            <Text style={styles.text}> {rowData.name} Text>
             View>
            View>
            TouchableOpacity>
        )
    }

ListView里的renderRow={this._renderRow}，然后会报错，显示null is not an object (evaluating '_this3._pressRow')，上图：

一看就知道是找不到方法，后来查阅这个资料，知道了解决方法，原来renderRow要与外面的this绑定起来，这个跟Android里的上下文环境Context很像：

{styles.list}
                    pageSize={2}
                    dataSource = {this.state.dataSource}
                    renderRow={this._renderRow.bind(this)}
                />

http://stackoverflow.com/questions/36303634/reactnative-tapping-row-in-listview-gives-error-cannot-read-property-pressr