Question

使用forwardRef

时出现 ts 错误

'employees' => [
    'driver' => 'eloquent',
    'model' => App\Employee::class,
],

在React Native中，父组件抛出此错误：

// [ts] Property 'forwardRef' does not exist on type 'typeof React'.
const MyComponent = React.forwardRef((props: Props, ref: any) => ...

有关如何解决它的想法吗？

Answer 1

根据definitions：

function forwardRef<T, P = {}>(Component: RefForwardingComponent<T, P>): ComponentType<P & ClassAttributes<T>>;
interface RefForwardingComponent<T, P = {}> {
    (props: P & { children?: ReactNode }, ref?: Ref<T>): ReactElement<any> | null;
    propTypes?: ValidationMap<P>;
    contextTypes?: ValidationMap<any>;
    defaultProps?: Partial<P>;
    displayName?: string;
}

ref是可选参数，请尝试以下操作：

在类中创建一个类型参数等于您所需目标的ref对象（在我的情况下为div，但View也可以在本机模式下工作）

private divRef: React.RefObject<div> = React.createRef();

在表示所转发组件的道具的接口中，将其公开为可选属性

interface Props {
  ref?: React.RefObject<div>;
}

声明类型为React.ComponentType的转发组件

const ComponentWithForwardedRef: React.ComponentType<Props> = 
  React.forwardRef((props: Props, ref?: React.Ref<div>) => (
    <div ref={ref}>{props.message}</div>
  ));

创建具有转发的引用的组件的实例时，将创建的引用对象作为prop发送

<ComponentWithForwardedRef ref={this.divRef} />

全合一：

import * as React from "react";
import { render } from "react-dom";

interface Props {
  message: string;
  ref?: React.RefObject<div>;
}

const ComponentWithForwardedRef: React.ComponentType<Props> = 
  React.forwardRef((props: Props, ref?: React.Ref<div>) => (
    <div ref={ref}>{props.message}</div>
  ));

class App extends React.Component<Props> {
  private divRef: React.RefObject<div> = React.createRef();

  public componentDidMount() {
    const div = this.divRef.current;
    // check the console!
    console.log(div);
  }

  public render() {
    return (
      <ComponentWithForwardedRef ref={this.divRef} {...this.props} />
    )
  }
}

render(<App message="hello world" />, document.getElementById("root"));

后代链接：https://codesandbox.io/s/6v152q394k

依赖性（参考目的）

"@types/react": "^16.3.11",
"@types/react-native": "^0.55.19",
"react-native": "0.55.2",
"typescript": "^2.8.1"

打字稿和反应原生的ForwardRef错误

1 个答案: