image_picker：类型（null）不支持压缩。返回原始质量的图像

我想更改所选图像的图像质量，但出现此错误。有谁知道如何解决这一问题？ （我从 iOS 设备获取了一张图像。）

image_picker: compressing is not supported for type (null). Returning the image with original quality

Future getImageFromCam() async {
    File image;
    try {
      image = await ImagePicker.pickImage(
          source: ImageSource.camera, imageQuality: 90);
    } on Exception {
      _showDialog(context);
    }
  }

根据源码，压缩图片仅支持JPEG
根据这个讨论https://discussions.apple.com/thread/8319465 https://discussions.apple.com/thread/8319465

All photos taken with the camera will be JPG, unless you go to Settings/Camera - Formats and choose High Efficiency. But High Efficiency will make the photos HEIF,

所以你可以用这个参考检查你的相机设置https://www.mactrast.com/2017/10/set-iphones-camera-back- saving-photos-jpeg-ios-11/ https://www.mactrast.com/2017/10/set-iphones-camera-back-saving-photos-jpeg-ios-11/

iOS部分

https://github.com/flutter/plugins/blob/master/packages/image_picker/ios/Classes/FLTImagePickerMetaDataUtil.m https://github.com/flutter/plugins/blob/master/packages/image_picker/ios/Classes/FLTImagePickerMetaDataUtil.m

(NSData *)convertImage:(UIImage *)image
               usingType:(FLTImagePickerMIMEType)type
                 quality:(nullable NSNumber *)quality {
  if (quality && type != FLTImagePickerMIMETypeJPEG) {
    NSLog(@"image_picker: compressing is not supported for type %@. Returning the image with "
          @"original quality",
          [FLTImagePickerMetaDataUtil imageTypeSuffixFromType:type]);
  }

省镖部分https://github.com/flutter/plugins/blob/master/packages/image_picker/lib/image_picker.dart https://github.com/flutter/plugins/blob/master/packages/image_picker/lib/image_picker.dart

 /// The `imageQuality` argument modifies the quality of the image, ranging from 0-100
  /// where 100 is the original/max quality. If `imageQuality` is null, the image with
  /// the original quality will be returned. Compression is only supportted for certain
  /// image types such as JPEG. If compression is not supported for the image that is picked,
  /// an warning message will be logged.