React Navigator StackNavigator：从同一场景调用两次时 goBack 不起作用

Question

假设我想实现一个具有目录结构的文件浏览器。我创建了一个 React Native 组件，它列出了特定文件夹的文件和目录。当我单击一个文件夹时，我希望进入新文件夹并列出其文件和文件夹。显然，我希望能够使用相同的 React 组件来渲染不同的文件夹。

我使用StackNavigator。这是我的代码

这是我的尝试，但不起作用：

import React, { Component } from 'react';
import {
  AppRegistry,
  BackHandler,
  ListView,
  StyleSheet,
  Text,
  TouchableNativeFeedback,
  View
} from 'react-native';

import {
  StackNavigator,
} from 'react-navigation';

export default class FileExplorerScene extends Component {
  // Initialize the hardcoded data
  constructor(props) {
    super(props);

    // Empty list before adding entries
    const ds = new ListView.DataSource({rowHasChanged: (r1, r2) => r1 !== r2 });
    this.state = {
      dataSource: ds.cloneWithRows(['a', 'b', 'c'])
    };
  }

  onPress(rowData) {
    console.log("onPress(" + rowData + ")");
    this.props.navigation.navigate('FileExplorer', { parent: rowData });
  }

  goBack() {
    this.props.navigation.goBack();
    return true;
  }

  componentWillMount() {
    BackHandler.addEventListener('hardwareBackPress', this.goBack.bind(this));
  }

  renderRow(rowData, sectionID, rowID) {
    return (
      <TouchableNativeFeedback onPress={ () => { this.onPress(rowData); }}>
        <Text style={{ margin:5, fontSize: 20}}>{ rowData }</Text>
      </TouchableNativeFeedback>
      );
  }

  render() {
    const { params } = this.props.navigation.state;

    var currentPath;
    if (params) {
      currentPath = (<Text style={{ margin:10, fontSize: 24}}>Current Path: {params.parent}</Text>);
    } else {
      currentPath = (<Text style={{ margin:10, fontSize: 24}}>Root path</Text>);
    }

    return (
      <View>
        { currentPath }
        <ListView
          dataSource={this.state.dataSource}
          renderRow={this.renderRow.bind(this)}
          enableEmptySections={true}
        />
      </View>
    );
  }
}

const App = StackNavigator(
  {
    FileExplorer: { screen: FileExplorerScene },
  },{
    headerMode: 'none',
  }
);

AppRegistry.registerComponent('ReactProject', () => App);

• 点击一个：我可以看到Current Path: a

  I/ReactNativeJS( 1125): onPress(a)
  I/ReactNativeJS( 1125): 'Navigation Dispatch: ', { action: 
  I/ReactNativeJS( 1125):    { type: 'Navigation/NAVIGATE',
  I/ReactNativeJS( 1125):      routeName: 'FileExplorer',
  I/ReactNativeJS( 1125):      params: { parent: 'a' },
  I/ReactNativeJS( 1125):      action: undefined },
  I/ReactNativeJS( 1125):   newState: 
  I/ReactNativeJS( 1125):    { index: 1,
  I/ReactNativeJS( 1125):      routes: 
  I/ReactNativeJS( 1125):       [ { routeName: 'FileExplorer', key: 'Init-id-1497310673011-0' },
  I/ReactNativeJS( 1125):         { params: { parent: 'a' },
  I/ReactNativeJS( 1125):           key: 'id-1497310673011-1',
  I/ReactNativeJS( 1125):           routeName: 'FileExplorer' } ] },
  I/ReactNativeJS( 1125):   lastState: 
  I/ReactNativeJS( 1125):    { index: 0,
  I/ReactNativeJS( 1125):      routes: [ { routeName: 'FileExplorer', key: 'Init-id-1497310673011-0' } ] } }
  

• 点击b：可以看到Current Path: b

  I/ReactNativeJS( 1125): onPress(b)
  I/ReactNativeJS( 1125): 'Navigation Dispatch: ', { action: 
  I/ReactNativeJS( 1125):    { type: 'Navigation/NAVIGATE',
  I/ReactNativeJS( 1125):      routeName: 'FileExplorer',
  I/ReactNativeJS( 1125):      params: { parent: 'b' },
  I/ReactNativeJS( 1125):      action: undefined },
  I/ReactNativeJS( 1125):   newState: 
  I/ReactNativeJS( 1125):    { index: 2,
  I/ReactNativeJS( 1125):      routes: 
  I/ReactNativeJS( 1125):       [ { routeName: 'FileExplorer', key: 'Init-id-1497310673011-0' },
  I/ReactNativeJS( 1125):         { params: { parent: 'a' },
  I/ReactNativeJS( 1125):           key: 'id-1497310673011-1',
  I/ReactNativeJS( 1125):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 1125):         { params: { parent: 'b' },
  I/ReactNativeJS( 1125):           key: 'id-1497310673011-2',
  I/ReactNativeJS( 1125):           routeName: 'FileExplorer' } ] },
  I/ReactNativeJS( 1125):   lastState: 
  I/ReactNativeJS( 1125):    { index: 1,
  I/ReactNativeJS( 1125):      routes: 
  I/ReactNativeJS( 1125):       [ { routeName: 'FileExplorer', key: 'Init-id-1497310673011-0' },
  I/ReactNativeJS( 1125):         { params: { parent: 'a' },
  I/ReactNativeJS( 1125):           key: 'id-1497310673011-1',
  I/ReactNativeJS( 1125):           routeName: 'FileExplorer' } ] } }
  

• 点击c：可以看到Current Path: c

  I/ReactNativeJS( 1125): onPress(c)
  I/ReactNativeJS( 1125): 'Navigation Dispatch: ', { action: 
  I/ReactNativeJS( 1125):    { type: 'Navigation/NAVIGATE',
  I/ReactNativeJS( 1125):      routeName: 'FileExplorer',
  I/ReactNativeJS( 1125):      params: { parent: 'c' },
  I/ReactNativeJS( 1125):      action: undefined },
  I/ReactNativeJS( 1125):   newState: 
  I/ReactNativeJS( 1125):    { index: 3,
  I/ReactNativeJS( 1125):      routes: 
  I/ReactNativeJS( 1125):       [ { routeName: 'FileExplorer', key: 'Init-id-1497310673011-0' },
  I/ReactNativeJS( 1125):         { params: { parent: 'a' },
  I/ReactNativeJS( 1125):           key: 'id-1497310673011-1',
  I/ReactNativeJS( 1125):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 1125):         { params: { parent: 'b' },
  I/ReactNativeJS( 1125):           key: 'id-1497310673011-2',
  I/ReactNativeJS( 1125):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 1125):         { params: { parent: 'c' },
  I/ReactNativeJS( 1125):           key: 'id-1497310673011-3',
  I/ReactNativeJS( 1125):           routeName: 'FileExplorer' } ] },
  I/ReactNativeJS( 1125):   lastState: 
  I/ReactNativeJS( 1125):    { index: 2,
  I/ReactNativeJS( 1125):      routes: 
  I/ReactNativeJS( 1125):       [ { routeName: 'FileExplorer', key: 'Init-id-1497310673011-0' },
  I/ReactNativeJS( 1125):         { params: { parent: 'a' },
  I/ReactNativeJS( 1125):           key: 'id-1497310673011-1',
  I/ReactNativeJS( 1125):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 1125):         { params: { parent: 'b' },
  I/ReactNativeJS( 1125):           key: 'id-1497310673011-2',
  I/ReactNativeJS( 1125):           routeName: 'FileExplorer' } ] } }
  

• 返回。我可以看到Current Path: b

  I/ReactNativeJS( 1125): goBack()
  I/ReactNativeJS( 1125): 'Navigation Dispatch: ', { action: { type: 'Navigation/BACK', key: 'id-1497310673011-3' },
  I/ReactNativeJS( 1125):   newState: 
  I/ReactNativeJS( 1125):    { index: 2,
  I/ReactNativeJS( 1125):      routes: 
  I/ReactNativeJS( 1125):       [ { routeName: 'FileExplorer', key: 'Init-id-1497310673011-0' },
  I/ReactNativeJS( 1125):         { params: { parent: 'a' },
  I/ReactNativeJS( 1125):           key: 'id-1497310673011-1',
  I/ReactNativeJS( 1125):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 1125):         { params: { parent: 'b' },
  I/ReactNativeJS( 1125):           key: 'id-1497310673011-2',
  I/ReactNativeJS( 1125):           routeName: 'FileExplorer' } ] },
  I/ReactNativeJS( 1125):   lastState: 
  I/ReactNativeJS( 1125):    { index: 3,
  I/ReactNativeJS( 1125):      routes: 
  I/ReactNativeJS( 1125):       [ { routeName: 'FileExplorer', key: 'Init-id-1497310673011-0' },
  I/ReactNativeJS( 1125):         { params: { parent: 'a' },
  I/ReactNativeJS( 1125):           key: 'id-1497310673011-1',
  I/ReactNativeJS( 1125):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 1125):         { params: { parent: 'b' },
  I/ReactNativeJS( 1125):           key: 'id-1497310673011-2',
  I/ReactNativeJS( 1125):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 1125):         { params: { parent: 'c' },
  I/ReactNativeJS( 1125):           key: 'id-1497310673011-3',
  I/ReactNativeJS( 1125):           routeName: 'FileExplorer' } ] } }
  

• 返回。没有变化

  I/ReactNativeJS( 1125): goBack()
  

• 返回。没有变化

  I/ReactNativeJS( 1125): goBack()
  

我是否正确使用goBack？还是StackNavigator 的问题？

Answer 1

实际上将this.props.navigation.goBack() 替换为this.props.navigation.goBack(null) 就可以了！
React Navigation documentation 相当混乱...

现在，一切都如我所愿：

• 点击a：可以看到Current Path: a

  I/ReactNativeJS( 2045): onPress(a)
  I/ReactNativeJS( 2045): 'Navigation Dispatch: ', { action: 
  I/ReactNativeJS( 2045):    { type: 'Navigation/NAVIGATE',
  I/ReactNativeJS( 2045):      routeName: 'FileExplorer',
  I/ReactNativeJS( 2045):      params: { parent: 'a' },
  I/ReactNativeJS( 2045):      action: undefined },
  I/ReactNativeJS( 2045):   newState: 
  I/ReactNativeJS( 2045):    { index: 1,
  I/ReactNativeJS( 2045):      routes: 
  I/ReactNativeJS( 2045):       [ { routeName: 'FileExplorer', key: 'Init-id-1497998297948-0' },
  I/ReactNativeJS( 2045):         { params: { parent: 'a' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-1',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' } ] },
  I/ReactNativeJS( 2045):   lastState: 
  I/ReactNativeJS( 2045):    { index: 0,
  I/ReactNativeJS( 2045):      routes: [ { routeName: 'FileExplorer', key: 'Init-id-1497998297948-0' } ] } }
  

• 点击b：可以看到Current Path: b

  I/ReactNativeJS( 2045): onPress(b)
  I/ReactNativeJS( 2045): 'Navigation Dispatch: ', { action: 
  I/ReactNativeJS( 2045):    { type: 'Navigation/NAVIGATE',
  I/ReactNativeJS( 2045):      routeName: 'FileExplorer',
  I/ReactNativeJS( 2045):      params: { parent: 'b' },
  I/ReactNativeJS( 2045):      action: undefined },
  I/ReactNativeJS( 2045):   newState: 
  I/ReactNativeJS( 2045):    { index: 2,
  I/ReactNativeJS( 2045):      routes: 
  I/ReactNativeJS( 2045):       [ { routeName: 'FileExplorer', key: 'Init-id-1497998297948-0' },
  I/ReactNativeJS( 2045):         { params: { parent: 'a' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-1',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 2045):         { params: { parent: 'b' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-2',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' } ] },
  I/ReactNativeJS( 2045):   lastState: 
  I/ReactNativeJS( 2045):    { index: 1,
  I/ReactNativeJS( 2045):      routes: 
  I/ReactNativeJS( 2045):       [ { routeName: 'FileExplorer', key: 'Init-id-1497998297948-0' },
  I/ReactNativeJS( 2045):         { params: { parent: 'a' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-1',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' } ] } }
  

• 点击c：可以看到Current Path: c

  I/ReactNativeJS( 2045): onPress(c)
  I/ReactNativeJS( 2045): 'Navigation Dispatch: ', { action: 
  I/ReactNativeJS( 2045):    { type: 'Navigation/NAVIGATE',
  I/ReactNativeJS( 2045):      routeName: 'FileExplorer',
  I/ReactNativeJS( 2045):      params: { parent: 'c' },
  I/ReactNativeJS( 2045):      action: undefined },
  I/ReactNativeJS( 2045):   newState: 
  I/ReactNativeJS( 2045):    { index: 3,
  I/ReactNativeJS( 2045):      routes: 
  I/ReactNativeJS( 2045):       [ { routeName: 'FileExplorer', key: 'Init-id-1497998297948-0' },
  I/ReactNativeJS( 2045):         { params: { parent: 'a' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-1',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 2045):         { params: { parent: 'b' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-2',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 2045):         { params: { parent: 'c' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-3',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' } ] },
  I/ReactNativeJS( 2045):   lastState: 
  I/ReactNativeJS( 2045):    { index: 2,
  I/ReactNativeJS( 2045):      routes: 
  I/ReactNativeJS( 2045):       [ { routeName: 'FileExplorer', key: 'Init-id-1497998297948-0' },
  I/ReactNativeJS( 2045):         { params: { parent: 'a' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-1',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 2045):         { params: { parent: 'b' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-2',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' } ] } }
  

• 返回。我可以看到Current Path: b

  I/ReactNativeJS( 2045): goBack()
  I/ReactNativeJS( 2045): 'Navigation Dispatch: ', { action: { type: 'Navigation/BACK', key: null },
  I/ReactNativeJS( 2045):   newState: 
  I/ReactNativeJS( 2045):    { index: 2,
  I/ReactNativeJS( 2045):      routes: 
  I/ReactNativeJS( 2045):       [ { routeName: 'FileExplorer', key: 'Init-id-1497998297948-0' },
  I/ReactNativeJS( 2045):         { params: { parent: 'a' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-1',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 2045):         { params: { parent: 'b' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-2',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' } ] },
  I/ReactNativeJS( 2045):   lastState: 
  I/ReactNativeJS( 2045):    { index: 3,
  I/ReactNativeJS( 2045):      routes: 
  I/ReactNativeJS( 2045):       [ { routeName: 'FileExplorer', key: 'Init-id-1497998297948-0' },
  I/ReactNativeJS( 2045):         { params: { parent: 'a' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-1',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 2045):         { params: { parent: 'b' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-2',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 2045):         { params: { parent: 'c' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-3',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' } ] } }
  

• 返回。我可以看到Current Path: a

  I/ReactNativeJS( 2045): goBack()
  I/ReactNativeJS( 2045): 'Navigation Dispatch: ', { action: { type: 'Navigation/BACK', key: null },
  I/ReactNativeJS( 2045):   newState: 
  I/ReactNativeJS( 2045):    { index: 1,
  I/ReactNativeJS( 2045):      routes: 
  I/ReactNativeJS( 2045):       [ { routeName: 'FileExplorer', key: 'Init-id-1497998297948-0' },
  I/ReactNativeJS( 2045):         { params: { parent: 'a' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-1',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' } ] },
  I/ReactNativeJS( 2045):   lastState: 
  I/ReactNativeJS( 2045):    { index: 2,
  I/ReactNativeJS( 2045):      routes: 
  I/ReactNativeJS( 2045):       [ { routeName: 'FileExplorer', key: 'Init-id-1497998297948-0' },
  I/ReactNativeJS( 2045):         { params: { parent: 'a' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-1',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' },
  I/ReactNativeJS( 2045):         { params: { parent: 'b' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-2',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' } ] } }
  

• 返回。我可以看到Root path

  I/ReactNativeJS( 2045): goBack()
  I/ReactNativeJS( 2045): 'Navigation Dispatch: ', { action: { type: 'Navigation/BACK', key: null },
  I/ReactNativeJS( 2045):   newState: 
  I/ReactNativeJS( 2045):    { index: 0,
  I/ReactNativeJS( 2045):      routes: [ { routeName: 'FileExplorer', key: 'Init-id-1497998297948-0' } ] },
  I/ReactNativeJS( 2045):   lastState: 
  I/ReactNativeJS( 2045):    { index: 1,
  I/ReactNativeJS( 2045):      routes: 
  I/ReactNativeJS( 2045):       [ { routeName: 'FileExplorer', key: 'Init-id-1497998297948-0' },
  I/ReactNativeJS( 2045):         { params: { parent: 'a' },
  I/ReactNativeJS( 2045):           key: 'id-1497998297948-1',
  I/ReactNativeJS( 2045):           routeName: 'FileExplorer' } ] } }
  

• 返回。不出所料:-)

  I/ReactNativeJS( 2045): goBack()