弹出后未绘制本机导航器父组件

Question

我的 Navigator 有问题...我有 2 个场景，主场景包含一个 ListView，第二个场景包含一个选择列表，允许我过滤主场景的 ListView 的元素...问题是当我从第二个场景返回时，未绘制 ListView 的过滤元素......行显示但它们是空的

我知道它们被显示是因为我用不同的颜色设置了行的样式并且颜色显示正确，我是否必须以某种方式强制渲染 ListView 组件？如果是，我应该怎么做？

这是代码的一些部分（我已经删除了不相关的部分）：

class App extends Component {
  renderScene(route, navigator) {
    switch (route.id) {
      case 'Main':
        return (<Main navigator={navigator} />);
      case 'FilterByBrand':
        return (<FilterByBrand navigator={navigator} brands={route.brands} callback={route.callback}/>);
    }
  }

  render () {
    return (
      <Navigator
        initialRoute={{id: 'Main'}}
        renderScene={this.renderScene}
      />
    );
  }
}

--

class Main extends Component {
  // code removed (irrelevant)

  updateBrands(brands) {
    var filter = {};

    // code to generate filter to be used not shown, is working ok

    this.setState({ brandFilter: filter });
  }

  render () {
    return (
      <Container>
        <Header>
          <Button>
            <Icon name='md-pricetags'
              onPress={()=>this.props.navigator.push({
                id: 'FilterByBrand',
                brands: this.state.brands,
                callback: this.updateBrands}
              )}
            />
          </Button>
        </Header>
        <Content>
          <ProdList
            item={this.state.items}
            brandFilter={this.state.brandFilter}
          />
        </Content>
      </Container>
    );
  }
}

--

class ProdList extends Component {
  constructor(props) {
    super(props);

    this.dataSource = new ListView.DataSource({rowHasChanged: (r1, r2) => r1 !== r2});
    this._filter = this._filter.bind(this);
    this._genRow = this._genRow.bind(this);
  }

  _genRow(item) {
    // code not shown (irrelevant)
  }

  _filter() {
    let output = this.props.items;

    // filtering code not shown, working ok
    return output;
  }

  render() {
    var dataSource = this.dataSource.cloneWithRows(this._filter());
    return (
      <ListView
        style={styles.container}
        dataSource={dataSource}
        renderRow={this._genRow}
        enableEmptySections={true}
      />
    );
  }
}

--

class FilterByBrand extends Component {

  selectBrand(id) {
    brands = // save here the selected brands

    // callback
    this.props.callback(brands);

    this.setState({brands: brands});
  }

  render () {
    return (
      <Container>
        <Header>
          <Button transparent onPress={()=>this.props.navigator.pop()}>
            <Icon name='ios-arrow-back' />
          </Button>
          <Title>Select brand(s)</Title>
        </Header>
        <Content>
          <List
            dataArray={this.state.brands}
            renderRow={ (brand) =>
              <ListItem onPress={() => this.selectBrand(brand.id)}>
                <Text>{brand.name}</Text>
              </ListItem>
            }
          />
        </Content>
      </Container>
    );
  }
}

Answer 1

可能是你忘记添加参考了。

var navigator;

class App extends Component {
  renderScene(route, navigator) {
    switch (route.id) {
      case 'Main':
        return (<Main navigator={navigator} />);
      case 'FilterByBrand':
        return (<FilterByBrand navigator={navigator} brands={route.brands} callback={route.callback}/>);
    }
  }

  render () {
    return (
      <Navigator
        ref={(nav) => { navigator = nav; }}
        initialRoute={{id: 'Main'}}
        renderScene={this.renderScene}
      />
    );
  }
}