如何将 PHPickerViewController 上显示的图像过滤为选择受限访问的图像

Question

如何将 PHPickerViewController 上显示的图像过滤为用户在有限访问权限下选择的图像？还是我需要使用不同的选择器？我已经为此苦苦挣扎了几天。任何帮助，将不胜感激。提前致谢。

当用户点击按钮时： 1-5 是自动的

1. 警报与相机或照片库一起出现

2. 他们选择照片库

3. 授权提醒显示选择照片...、允许访问所有照片或不允许

4. 他们点击选择照片 = .limited

5. 显示 presentLimitedLibraryPicker，供用户选择要允许的照片并点击完成。

6. 现在我希望选择器显示用户刚刚选择的图像的过滤选择。似乎这也是自动的。不是……

这仅显示用户选择受限访问的同一个选择器。

PHPhotoLibrary.shared().presentLimitedLibraryPicker(from: self)

.limited 的情况如何？

var config = PHPickerConfiguration()
config.selectionLimit = 1
config.filter = PHPickerFilter.any(of: [.images, .livePhotos])
let picker_Photo = PHPickerViewController(configuration: config)
picker_Photo.delegate = self

let libCell = UIAction(title: "Photo Library", image: UIImage(systemName: "photo"), identifier: .none, discoverabilityTitle: .none) { (libAction) in
                
    if UIImagePickerController.isSourceTypeAvailable(.photoLibrary)
    {
        PHPhotoLibrary.requestAuthorization(for: .readWrite) { status in
            
            switch status
            {
            case .limited:
                DispatchQueue.main.async
                {
                    // PHPhotoLibrary.shared().register(self)
                    // PHPhotoLibrary.shared().presentLimitedLibraryPicker
                    self.present(picker_Photo, animated: true, completion: nil)
                }
                
            case .authorized:
                DispatchQueue.main.async
                {
                    self.present(picker_Photo, animated: true, completion: nil)
                }
                
            case .notDetermined:
                DispatchQueue.main.async
                {
                    self.present(picker_Photo, animated: true, completion: nil)
                }
                
            case .restricted:
                self.view.sendConfirmationAlert(theTitle: "Photo Library Restricted",
                                                theMessage: "Photo Library access was previously denied. Please update your Settings to allow access.", buttonTitle: "Ok")
                
            case .denied:
                let settingsAlert = UIAlertController(title: "Photo Library Access Denied",
                                                      message: "Photo Library access was previously denied. Please update your Settings to allow access.", preferredStyle: .alert)
                
                let settingsAction = UIAlertAction(title: "Go to Settings", style: .default) { ( action ) in
                    let settingsUrl = URL(string: UIApplication.openSettingsURLString)
                    UIApplication.shared.open(settingsUrl!, options: [:])
                }
                let cancelAction = UIAlertAction(title: "Cancel", style: .cancel)
                DispatchQueue.main.async
                {
                    settingsAlert.addAction(settingsAction)
                    settingsAlert.addAction(cancelAction)
                    self.present(settingsAlert, animated: true)
                }
                
            default:
                return
            }
        }
    }
}

Answer 1

您对受限访问的含义有误。它限制了您可以在照片库中读取和写入的信息。

但您的代码首先不从照片库中读取。你在说

config = PHPickerConfiguration()

所以这意味着您根本无法通过选择器访问照片库。您只能获取图像副本。因此，您不需要 任何 种权限来显示选择器，并且用户限制对您而言没有区别。实际上，您可以丢弃所有与授权相关的代码；它没有效果。没有它，您的选择器将完全一样地工作。

如果您需要通过选择器访问照片库，您会调用

https://developer.apple.com/documentation/photokit/phpickerconfiguration/3616114-init

在这种情况下，用户限制对你很重要——当你试图访问一个实际的 PHAsset 时。但是您的代码从不这样做。您正在请求您不需要的权限。