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我正在尝试动态更改 TabView 的内容。基本上,当用户打开应用程序时,屏幕会获取用户帐户并为用户拥有的每种不同货币呈现一个选项卡。(因此,如果用户有 10 个美元帐户,则只会显示一个美元选项卡,但如果他有 1 个美元和 1 个欧元帐户,则会显示一个美元和一个欧元选项卡)。

当用户打开应用程序时一切正常,但是当他创建或删除帐户时,TabView 不会更新,并且如果新状态的货币数量少于以前的状态,则会显示旧状态或崩溃。

 private _renderCardsTabs = () => {
    const { accounts: { accounts } } = this.props;
    console.log("debug _renderCardTabs", accounts)

    if (accounts.length === 0 || accounts.length < 1) {
      return this._renderEmptyCardsTabs();
    }

    let scenes = this._renderTabs()

    return (
      <TabView
        navigationState={this.state}
        renderTabBar={this._renderTabBar}
        renderScene={({ route }) => {
          return scenes[route.key]()
        }}
        onIndexChange={this._tabHandler}
      />
    );
  }

      private _renderTabBar = (props) => {
    return (
      <View style={styles.tabBarWrapper}>
        <TabBar
          {...props}
          indicatorStyle={styles.indicator}
          style={styles.tabBar}
          labelStyle={styles.label}
          scrollEnabled={false}
          pressOpacity={1}
        />
      </View>
    )

      private _renderTabs = () => {
    const { accounts: { accounts } } = this.props;

    return [...new Set(accounts.map((account: any) => account.currency_symbol.split('-')[1].toLowerCase()))]
      .reduce((acc, item) => {
        acc[item] = () => {
          const { navigation } = this.props;
          return <CardsScreen navigation={navigation} currency={item.toUpperCase()} />;
        };
        return acc;
      }, {});
  }

错误

TypeError: scenes[route.key] is not a function

我尝试过的事情(我使用了 SceneMap)

4

1 回答 1

1

结果导航状态没有更新,我需要用最新的路线更新它,这应该在 React 组件生命周期中正确完成,但现在只需手动设置它就可以this.state.routes = this._getRoutes()解决问题。

 private _renderCardsTabs = () => {
    const { accounts: { accounts } } = this.props;

    if (accounts.length === 0 || accounts.length < 1) {
      return this._renderEmptyCardsTabs();
    }

    let scenes = this._renderTabs()
    // This should not go here but it works, I need to update this.state after accounts
    // are updated by sagas from somewhere that doesn't cause a rerender 
    this.state.routes = this._getRoutes()

    return (
      <TabView
        navigationState={this.state}
        renderTabBar={this._renderTabBar}
        renderScene={({ route }) => {
          return scenes[route.key]()
        }}
        onIndexChange={this._tabHandler}
      />
    );
  }
于 2019-11-27T01:21:43.483 回答