Question

在我的应用中，我可以使用以下功能从数组中获取值，距离和位置名称。但是，我无法使用mapDispatchToProps在我的redux存储中分派从它们获得的值，例如

      handleNavigation() {
        this.props.navigation.navigate('LocationLists');
        this.props.totalDistanceChange(this.totalDistance()).
      }


      <Button
        onPress={this.handleNavigation.bind(this)}
      />





    const mapDispatchToProps = (dispatch) => ({
     totalDistanceChange: totalDistance=> {
       dispatch(totalDistanceChange(totalDistance));
     }
    });

在现有状态转换期间，我一直无法获取更新。下面只是我要使其保持尽可能简单的功能，请在适当的地方正确无误。

      totalDistance = () => {
        const { selectedItemObjects } = this.state;
        const total = selectedItemObjects.reduce((result, { Distance }) => result += Distance, 0);
        return total.toFixed(1);
      }

      totalValue = () => {
        const { selectedItemObjects } = this.state;
        const total = selectedItemObjects.reduce((result, { Value }) => result += Value, 0);
        return total;
      }

      renderLocationText = () => {
        const { selectedItemObjects } = this.state;
        return selectedItemObjects.length ?
        `${selectedItemObjects.map((item, i) => {
          let label = `${item.name}, `;
          if (i === selectedItemObjects.length - 2) label = `${item.name} and `;
          if (i === selectedItemObjects.length - 1) label = `${item.name}.`;
          return label;
        }).join('')}`
        :
        null;
      }

我的问题是如何将获得的值传递给我的redux存储区

Answer 1

const mapDispatchToProps = (dispatch) => ({
// HERE YOU HAVE GIVEN THE SAME NAME 'totalDistanceChange'
  totalDistanceChange: totalDistance=> {
     dispatch(totalDistanceChange(totalDistance));
  }
});

喜欢这样做。

this.props.onTotalDistanceChange(this.totalDistance());

const mapDispatchToProps = (dispatch) => ({
  onTotalDistanceChange: totalDistance=> {
     dispatch(totalDistanceChange(totalDistance));
  }
});

Answer 2

通过将其转换为字符串进行了修复

  handleNavigation() {
    this.props.navigation.navigate('LocationLists');
    this.props.totalDistanceChange(this.totalDistance().toString()).
  }

在现有状态转换期间无法更新本机响应

2 个答案: