NSInvalidArgumentException', reason: 'The Live Photo type cannot be specified without the Image media type'

I'm trying to fetch only Live Photos from my gallery for processing tasks. However, the below code gives a runtime crash:

        let imagePicker = UIImagePickerController()
        imagePicker.sourceType = .photoLibrary
        //imagePicker.mediaTypes = [kUTTypeImage, kUTTypeLivePhoto] as [String]
        imagePicker.mediaTypes = [kUTTypeLivePhoto] as [String]
        imagePicker.delegate = self
        present(imagePicker, animated: true, completion: nil)

Error: NSInvalidArgumentException', reason: 'The Live Photo type cannot be specified without the Image media type'

Coincidentally, using PHPhotosPicker with SwiftUI (iOS 16+) successfully fetches live photos only:

PhotosPicker(selection: $viewModel.imageSelection,
                             matching: .livePhotos,
							 photoLibrary: .shared())

So, curious to know what's wrong with the former code?

</details>


# 答案1
**得分**: 1

以下是翻译好的部分：

「UIImagePickerController」的[文档](https://developer.apple.com/documentation/uikit/uiimagepickercontroller)中指出：

&gt; 当用户在图像选择器中选择 Live Photo 时，如果要获取完整的动态图像和声音内容，*必须*在 mediaTypes 数组中同时包含 kUTTypeImage 和 kUTTypeLivePhoto 类型。

但更重要的是，在 iOS 14.0 中已弃用 `.photoLibrary` 源类型。[文档](https://developer.apple.com/documentation/uikit/uiimagepickercontroller/sourcetype/photolibrary)中指出：

&gt; 已弃用
请改用 PHPickerViewController。

只能使用 `UIImagePickerController` 来使用相机拍照。要选择现有媒体，请使用 `PHPickerViewController`。它具有更多有用的功能，并支持本例所需的内容。

<details>
<summary>英文:</summary>

The [documentation](https://developer.apple.com/documentation/uikit/uiimagepickercontroller) for `UIImagePickerController` states:

&gt;To obtain the full motion and sound content when the user chooses a Live Photo with the image picker, you *must* include both the kUTTypeImage and kUTTypeLivePhoto types in the mediaTypes array.

But more importantly, the `.photoLibrary` source type was deprecated in iOS 14.0. The [documentation](https://developer.apple.com/documentation/uikit/uiimagepickercontroller/sourcetype/photolibrary) states:

&gt;Deprecated  
Use PHPickerViewController instead.

Only use `UIImagePickerController` to take photos with the camera. For selecting existing media, use `PHPickerViewController`. It has many more useful features. And it supports what you want in this case.


</details>