使用Flutter Camera软件包，如何将照片转换为base64字符串？

import 'package:camera/camera.dart';

List<CameraDescription> cameras;

Future<void> initCamera() async {
  cameras = await availableCameras();
  final CameraController controller = CameraController(
    cameras[0],
    ResolutionPreset.medium,
  );
  await controller.initialize();
  // 拍摄照片
  final XFile imageFile = await controller.takePicture();
  // 将照片转换为base64字符串
  final String base64Image = await convertImageToBase64(imageFile);
  // 使用base64Image进行后续操作
}

Future<String> convertImageToBase64(XFile imageFile) async {
  final bytes = await imageFile.readAsBytes();
  return base64Encode(bytes);
}