子组件

export interface MychildRef {
  childClick: () => void;
}
const Test = (props: {}, ref: React.Ref<MychildRef>) => {
  const {
    data: userInfo,
    loading,
    run,
  } = useRequest(getUserInfo, {
    manual: true,
  });
  useImperativeHandle(ref, () => ({
    childClick: () => {
      clickHandle();
    },
  }));
  const [flag, { toggle }] = useBoolean(true);
  const clickHandle = () => {
    let text = flag ? "大可" : "小涛";
    run(text);
    toggle();
  };

  return (
    <>
      <button onClick={clickHandle}>点击</button>
      {loading ? <div>loading...</div> : <div>Username: {userInfo?.name}</div>}
    </>
  );
};
export default forwardRef(Test);

父组件调用

function App() {
  const inputEl = useRef<MychildRef>(null);
  const clickChildHandle = () => {
    inputEl.current?.childClick();
  };
  return (
    <div className="App">
        <button onClick={clickChildHandle}>点击儿子节点</button>
        <Test1 ref={inputEl}></Test1>
    </div>
  );
}