13.4.1设备一直无法多选图片,查看源码。Xcode工程的GeneratePluginRegistrant新增了对应的注册代码。在上一个界面接收从相册中选择的图片并刷新界面。中没有对limit做任何处理代码。在Flutter中许可使用。更新Xcode的po就是选择多张照片在iOS平台上只在14+才生效,用的是PhotosUI.framework中的PHPicker,因为手上测试机

环境

Flutter 3.29

macOS Sequoia 15.4.1

Xcode 16.3

iOS 13.4.1
iOS 18.5

集成image_picker

在Flutter中可以使用image_picker插件实现从相册中获取图片

添加插件

flutter中访问相册image_picker插件

¥ flutter pub add image_picker
¥ flutter pub get

Xcode工程的GeneratePluginRegistrant新增了对应的注册代码

+ (void)registerWithRegistry:(NSObject<FlutterPluginRegistry>
  *)registry {
  ...
  [FLTImagePickerPlugin registerWithRegistrar:[registry registrarForPlugin:@"FLTImagePickerPlugin"]];
  ...
  }

更新Xcode的pod依赖

¥ pod update

添加权限

<key>NSPhotoLibraryUsageDescription</key>
<string>需要访问相册以选择图片</string>
<!-- image_picker也支持直接拍照 -->
<key>NSCameraUsageDescription</key>
<string>需要访问相机用于拍照</string>
<key>NSMicrophoneUsageDescription</key>
<string>需要访问麦克风用于拍摄视频</string>

获取单张照片

可以使用ImagePicker().pickerImage()获取单张图片

else if (index == 2) {
_pickImage(ImageSource.gallery),
}

Future<
void>
_pickImage(ImageSource source) async {
try {
// source值可以是相机(camera)或相册(gallery)
final pickedFile = await ImagePicker().pickImage(source: source);
if (pickedFile != null) {
setState(() {
if (mounted) {
// pop弹窗并返回从相册中选择的图片
Navigator.pop(context, pickedFile);
}
});
}
} catch (e) {
debugPrint("图片选择错误: $e");
}
}

在上一个界面接收从相册中选择的图片并刷新界面

floatingActionButton: FloatingActionButton(
onPressed: () async {
final result = await menuWidget(context: context);
if (result != null) {
setState(() {
_defaultCover = result;
});
}
},
backgroundColor: Colors.orangeAccent,
child: const Icon(Icons.add, color: Colors.white),
),
Future menuWidget({required BuildContext context
}) async {
return Navigator.push(
context,
PageRouteBuilder(
opaque: false,
barrierColor: Colors.black.withValues(alpha: 0.2),
pageBuilder:
(context, animation, secondaryAnimation) =>
PopScope(canPop: true, child: MenuWidget()),
transitionsBuilder:
(context, animation, secondaryAnimation, child) =>
SlideTransition(
position: Tween<Offset>
  (
  begin: const Offset(0.0, 2.4),
  end: Offset.zero,
  ).animate(animation),
  child: SlideTransition(
  position: Tween<Offset>
    (
    begin: Offset.zero,
    end: const Offset(0.0, 2.4),
    ).animate(secondaryAnimation),
    child: child,
    ),
    ),
    ),
    );
    }

iOS

Andorid

获取多张照片

可以使用ImagePicker().pickMultiImage()获取多张图片

_pickMultiImage(),

Future<
void>
_pickMultiImage() async {
try {
// 设置最多获取9张图片
final pickedFiles = await ImagePicker().pickMultiImage(limit: 9);
if (pickedFiles.isNotEmpty) {
setState(() {
if (mounted) {
Navigator.pop(context, pickedFiles);
}
});
}
} catch (e) {
debugPrint("图片选择错误: $e");
}
}

floatingActionButton: FloatingActionButton(
onPressed: () async {
final result = await menuWidget(context: context);
if (result != null) {
setState(() {
if (result is XFile) {
_defaultCover = result;
/// 选择多张照片
} else if (result is List<XFile>
  ) {
  _defaultCover = result[0];
  }
  });
  }
  },
  backgroundColor: Colors.orangeAccent,
  child: const Icon(Icons.add, color: Colors.white),
  ),

选择多张照片在iOS平台上只在14+才生效,用的是PhotosUI.framework中的PHPicker,因为手上测试机是13.4.1设备一直无法多选图片,查看源码

- (void)pickMultiImageWithMaxSize:(nonnull FLTMaxSize *)maxSize
quality:(nullable NSNumber *)imageQuality
fullMetadata:(BOOL)fullMetadata
limit:(nullable NSNumber *)limit
completion:(nonnull void (^)(NSArray<NSString *>
  *_Nullable,
  FlutterError *_Nullable))completion {
  [self cancelInProgressCall];
  FLTImagePickerMethodCallContext *context =
  [[FLTImagePickerMethodCallContext alloc] initWithResult:completion];
  context.maxSize = maxSize;
  context.imageQuality = imageQuality;
  context.requestFullMetadata = fullMetadata;
  context.maxImageCount = limit.intValue;
  if (@available(iOS 14, *)) {
  [self launchPHPickerWithContext:context];
  } else {
  // Camera is ignored for gallery mode, so the value here is arbitrary.
  [self launchUIImagePickerWithSource:[FLTSourceSpecification makeWithType:FLTSourceTypeGallery
  camera:FLTSourceCameraRear]
  context:context];
  }
  }

limit值传了9,但是launchUIImagePickerWithSource:context:中没有对limit做任何处理代码

- (void)launchUIImagePickerWithSource:(nonnull FLTSourceSpecification *)source
context:(nonnull FLTImagePickerMethodCallContext *)context {
UIImagePickerController *imagePickerController = [self createImagePickerController];
imagePickerController.modalPresentationStyle = UIModalPresentationCurrentContext;
imagePickerController.delegate = self;
...

获取视频

使用ImagePicker().pickMedia()可以从相册获取视频文件

Future<
void>
_pickVideo() async {
try {
final pickedVideo = await ImagePicker().pickMedia();
if (pickedVideo != null) {
setState(() {
});
}
} catch (e) {
debugPrint("图片选择错误: $e");
}
}

获取多媒体文件

使用ImagePicker().pickMultipleMedia()可以从相册获取视频和照片

Future<
void>
_pickMultiMedia() async {
try {
final pickedMedia = await ImagePicker().pickMultipleMedia();
setState(() {
// 页面刷新
Navigator.pop(context, pickedMedia);
});
} catch (e) {
debugPrint("图片选择错误: $e");
}
}

参考

1. Image Picker plugin for Flutter