类组件本身无法直接使用React.forwardRef
来暴露出ref引用。但是,您可以在类组件内部使用React.forwardRef
来包裹类组件,从而使类组件支持ref转发。以下是一个示例代码,展示了如何在类组件内部使用React.forwardRef
来支持ref转发:
import React, { Component } from 'react'; // 子组件(类组件) class ChildComponent extends Component { method1() { console.log('Method 1 called'); } method2() { console.log('Method 2 called'); } render() { return <div>Child Component</div>; } } // 使用 React.forwardRef 包裹类组件 const ForwardedChildComponent = React.forwardRef((props, ref) => { return <ChildComponent ref={ref} {...props} />; }); // 父组件(函数组件) const ParentComponent = () => { const childRef = React.createRef(); const callChildMethod1 = () => { childRef.current.method1(); }; const callChildMethod2 = () => { childRef.current.method2(); }; return ( <div> <ForwardedChildComponent ref={childRef} /> <button onClick={callChildMethod1}>Call Method 1</button> <button onClick={callChildMethod2}>Call Method 2</button> </div> ); }; export default ParentComponent;
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