react-native – 绑定传递给组件的函数

constructor(props) {
    super(props);

    //binding function
    this.renderRow = this.renderRow.bind(this);
    this.callThisFunction = this.callThisFunction.bind(this);
    }

或者我会得到这样的错误.

null is not an object: evaluating this4.functionName

遵循该建议,我在构造函数中绑定了函数,但我仍然得到相同的错误.

我正在使用React Native制作一个Master / Detail应用程序,该应用程序基于react native repo中的Movies示例,但我不使用此语法

var SearchScreen = React.createClass({

(这是repo的意思)而是这个ES6风格的语法

class ListOfLists extends Component {

在我的列表视图中,我呈现这样的行.

class MovieList extends Component{
      constructor(props){
        super(props);
        this.selectMovie = this.selectMovie.bind(this);
        this.state = {
          dataSource: new ListView.DataSource({
            rowHasChanged: (row1,row2) => row1 !== row2,}),};
      }
          renderRow(
            movie: Object,sectionID: number | string,rowID: number | string,highlightRowFunc: (sectionID: ?number | string,rowID: ?number | string) => void,) {
          console.log(movie,"in render row",sectionID,rowID);
            return (
              <ListCell 
                onSelect={() => this.selectMovie(movie)}
                onHighlight={() => highlightRowFunc(sectionID,rowID)}
                onUnhighlight={() => highlightRowFunc(null,null)}
                movie={movie}
              />
            );
          }

       selectMovie(movie: Object) {
        if (Platform.OS === 'ios') {
          this.props.navigator.push({
            title: movie.name,component: TodoListScreen,passProps: {movie},});
        } else {
          dismissKeyboard();
          this.props.navigator.push({
            title: movie.title,name: 'movie',movie: movie,});
        }
      }
     render(){
        var content = this.state.dataSource.getRowCount() === 0 ?
            <NoMovies  /> :
            <ListView
             ref="listview"
             renderSeparator={this.renderSeparator}
             dataSource={this.state.dataSource}
             renderFooter={this.renderFooter}
             renderRow={this.renderRow} 
             automaticallyAdjustContentInsets={false}
             keyboardDismissMode="on-drag"
             keyboardShouldPersistTaps={true}
             showsVerticalScrollIndicator={false}
             renderRow={this.renderRow}
     }

关键是this.selectMovie(电影).当我单击带有电影名称的行时,出现错误

null is not an object: evaluating this4.selectMovie

问题：为什么告诉我null不是一个对象,或者为什么该函数为null？

更新：

我在代码中添加了render方法,以显示renderRow的使用位置