如何使用 recompose 获取包装好的组件实例?

How to get wrapped component instance with recompose?

我正在使用 lifecycle 创建高阶组件。我需要访问包装的组件实例。我怎样才能得到它?

例如

export default function ajaxLoader(options) {
    return lifecycle({
        componentWillMount() {
            // how to get *wrapped* component instance here?
            // `this` refers to an instance of the lifecycle HOC, not the wrapped component
            // i.e., I want the instance of `SomeComponent`
        }
    }) // this returns a function that accepts a component *class*
}

还有用法,如果你也想看:

class SomeComponent extends React.PureComponent {

    render() {
        return <span/>;
    }
}

const WrappedComponent = ajaxLoader({
    // options
})(SomeComponent);

认为 如果我覆盖我的 HOC 中的 render() 方法,我可以获得对包装组件的引用,并使用 [=14 渲染包装组件=],但是 recompose 特别不允许我自己实现 render 方法。

It supports the entire Component API, except the render() method, which is implemented by default (and overridden if specified; an error will be logged to the console).

如果您必须访问实例方法,您可以这样做:

class ParentComponent extends Component {
  constructor(props) {
    super(props);
    this.childController = null;
  }

  // access child method via this.childController.instanceMethod

  render() {
    return <DecoratedChildComponent provideController={controller => this.childController = controller} />
  }
}

class ChildComponent extends Component {
  componentDidMount() {
    this.props.provideController({
      instanceMethod: this.instanceMethod,
    })
  }

  componentWillUnmount() {
    this.props.provideController(null);
  }

  instanceMethod = () => {
    console.log("I'm the instance method");
  }
}

这有点复杂,在大多数情况下可以避免,但如果您确实需要访问实例方法,这会起作用