如何更改颤动webview setState()方法

import React, { Component } from 'react';
import { WebView } from 'react-native';

class MyWebView extends Component {
  constructor(props) {
    super(props);
    this.state = {
      url: 'https://www.example.com',
      visible: true
    };
  }

  changeURL = () => {
    this.setState({ url: 'https://www.newurl.com' });
  }

  toggleVisibility = () => {
    this.setState(prevState => ({ visible: !prevState.visible }));
  }

  render() {
    const { url, visible } = this.state;

    return (
      <React.Fragment>
        {visible && <WebView source={{ uri: url }} />}
        <button onClick={this.changeURL}>Change URL</button>
        <button onClick={this.toggleVisibility}>
          {visible ? 'Hide Webview' : 'Show Webview'}
        </button>
      </React.Fragment>
    );
  }
}

export default MyWebView;