null is not object evaluating ('_this3_selectRow')

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>        )    }
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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：

<ListView                     contentContainerStyle = {styles.list}                    pageSize={2}                    dataSource = {this.state.dataSource}                    renderRow={this._renderRow.bind(this)}                />
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http://stackoverflow.com/questions/36303634/reactnative-tapping-row-in-listview-gives-error-cannot-read-property-pressr