在react中设置状态后如何清除输入值？

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      inputValue: ''
    };
  }

  handleChange(event) {
    this.setState({ inputValue: event.target.value });
  }

  handleClear() {
    this.setState({ inputValue: '' });
  }

  render() {
    return (
      <div>
        <input
          type="text"
          value={this.state.inputValue}
          onChange={this.handleChange.bind(this)}
        />
        <button onClick={this.handleClear.bind(this)}>Clear</button>
      </div>
    );
  }
}

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.inputRef = React.createRef();
  }

  handleClear() {
    this.inputRef.current.value = '';
  }

  render() {
    return (
      <div>
        <input type="text" ref={this.inputRef} />
        <button onClick={this.handleClear.bind(this)}>Clear</button>
      </div>
    );
  }
}