React 通过 Refs父组件调用子组件内的方法

在 TypeScript 中，使用 TSX（TypeScript JSX）时，通过 refs 调用子组件的方法：

ParentComponent.tsx:

import React, { useRef } from 'react';
import ChildComponent, { ChildMethods } from './ChildComponent';

const ParentComponent: React.FC = () => {
  const childRef = useRef<ChildMethods>(null);

  const callChildMethod = () => {
    if (childRef.current) {
      childRef.current.childMethod();
    }
  };

  return (
    <div>
      <ChildComponent ref={childRef} />
      <button onClick={callChildMethod}>Call Child Method</button>
    </div>
  );
};

export default ParentComponent;

ChildComponent.tsx:

import React, { forwardRef, useImperativeHandle } from 'react';

interface ChildComponentProps {
  // ... other props
}

export interface ChildMethods {
  childMethod: () => void;
}

const ChildComponent = forwardRef<ChildMethods, ChildComponentProps>((props, ref) => {
  const childMethod = () => {
    console.log('Child method called from parent.');
  };

  useImperativeHandle(ref, () => ({
    childMethod,
  }));

  return (
    <div>
      {/* Child component UI */}
    </div>
  );
});

export default ChildComponent;

你会看到