React本机fetch blob未在iOS上下载映像

function downloadImage(url) {
  return new Promise((resolve, reject) => {
    const xhr = new XMLHttpRequest();
    xhr.open('GET', url, true);
    xhr.responseType = 'blob';

    xhr.onload = () => {
      if (xhr.status === 200) {
        resolve(xhr.response);
      } else {
        reject(new Error(xhr.statusText));
      }
    };

    xhr.onerror = () => {
      reject(new Error('Network error'));
    };

    xhr.send();
  });
}

class ImageComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      imageSrc: null,
    };
  }

  componentDidMount() {
    const imageUrl = 'https://example.com/image.jpg';
    downloadImage(imageUrl)
      .then((blob) => {
        const imageSrc = URL.createObjectURL(blob);
        this.setState({ imageSrc });
      })
      .catch((error) => {
        console.error(error);
      });
  }

  render() {
    const { imageSrc } = this.state;
    return <img src={imageSrc} alt="Image" />;
  }
}