saveImage static method

Future<String?> saveImage(
  1. String imagePath
)

Question: why the application ID in the local path is different every time I launch the app use flutter in ios?

In iOS, the application's directory path includes the application's unique identifier (UUID), which is generated anew each time the app is installed. This means that if you uninstall and then reinstall the app, or if you're installing new builds of the app during development, the UUID will change, and so will the full path to the app's directory. This is a security feature of iOS. It prevents one app from knowing the path to another app's directory, which could potentially be used to access the other app's data. In your Flutter code, you should never hard-code the full path to the app's directory. Instead, you should always use the getApplicationDocumentsDirectory or getLibraryDirectory methods from the path_provider package to get the current path to the app's directory. This ensures that your code will work correctly even if the app's UUID changes. Here's an example of how you can get the app's directory path:

import 'package:path_provider/path_provider.dart';

Future<String> getApplicationDirectoryPath() async {
  final Directory directory = await getApplicationDocumentsDirectory();
  return directory.path;
}

This function will always return the current path to the app's directory, even if the app's UUID changes.

Implementation

static Future<String?> saveImage(String imagePath) async {
  try {
    final File imageFile = File(imagePath);

    /// Get the app's directory path
    /// Result is such as `/var/mobile/Containers/Data/Application/2F46BAD9-3C9C-4771-878F-7FE25238106B/Documents/2024-04-07T11:40:52.985441.jpg`.
    // final Directory directory = await getApplicationDocumentsDirectory();

    /// Result is such as `/var/mobile/Containers/Data/Application/2F46BAD9-3C9C-4771-878F-7FE25238106B/Library/2024-04-07T11:42:37.332963.jpg`.
    final Directory directory = await getLibraryDirectory();

    /// Result is such as `/var/mobile/Containers/Data/Application/2640D898-6053-4213-A810-8A6E11DD48C2/Library/Application Support/2024-04-07T11:46:30.440009.jpg`.
    // final Directory directory = await getApplicationSupportDirectory();

    /// PathNotFoundException: Cannot copy file to '/var/mobile/Containers/Data/Application/2640D898-6053-4213-A810-8A6E11DD48C2/Downloads/2024-04-07T11:49:00.931488.jpg',
    /// path = '/private/var/mobile/Containers/Data/Application/2640D898-6053-4213-A810-8A6E11DD48C2/tmp/image_picker_8C545078-F167-43FC-BE00-AB5715957ADE-1498-000002DBA209F3C0.jpg'
    /// (OS Error: No such file or directory, errno = 2)
    // final Directory directory = (await getDownloadsDirectory())!;

    /// Unsupported operation: getExternalStoragePath is not supported on this platform,<…>
    // final Directory directory = (await getExternalStorageDirectory())!;

    /// This is not support on iOS.
    // final Directory directory =
    //     await getExternalStorageDirectories(type: StorageDirectory.downloads)
    //         .then((value) => value!.first);

    // Create a new path in the app's directory
    final String newPath =
        '${directory.path}/${DateTime.now().toIso8601String()}.jpg';

    mLogger.d('MUtilPickerImage::saveImage::newPath::$newPath');

    // Copy the image file to the new path
    final File newImageFile = await imageFile.copy(newPath);

    // Return the new image path
    return newImageFile.path;
  } catch (e, s) {
    mLogger.e('saveImage::error::$e,\n', stackTrace: s, error: e);
    mShowCustomToast('Failed to save image, please check the permission'.tr);
    return null;
  }
}