如何從UIImagePickerController獲取授權的PHAsset？

Question

我有以下代碼：

@IBAction func importButtonPressed(_ sender: Any) {
        self.imagePicker.sourceType = .photoLibrary
        self.imagePicker.allowsEditing = true
        self.imagePicker.mediaTypes = [kUTTypeMovie as String, kUTTypeImage as String]

        self.present(self.imagePicker,animated: true, completion: nil)
}

這完美呈現了UIImagePicker。 然后，當我想使用選取的項目說出PHAsset的日期時：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        guard info[UIImagePickerControllerMediaType] != nil else { return }
        let mediaType = info[UIImagePickerControllerMediaType] as! CFString
        switch mediaType {
        case kUTTypeImage:
            if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
                ...
            }
            break
        case kUTTypeMovie:
            if let videoURL = info[UIImagePickerControllerMediaURL] as? URL, let pickedAsset = info[UIImagePickerControllerPHAsset] as? PHAsset {
                print("kUTTypeMovie")
                MyVariables.isScreenshot = false
                let creationDate = pickedAsset.creationDate
                print(creationDate,"creationDate")
            }
            break
        case kUTTypeLivePhoto:
            print("livePhoto")
            dismiss(animated: true, completion: nil)

            break
        default:
            dismiss(animated: true, completion: nil)

            print("something else")
            break
        }
    }

現在，當我選擇一個視頻時，我認為print("kUTTypeMovie")失敗了，因為let pickedAsset = info[UIImagePickerControllerPHAsset] as? PHAsset let pickedAsset = info[UIImagePickerControllerPHAsset] as? PHAsset失敗

在其他地方（ UIImagePickerControllerDelegate從iOS 11中的拾取圖像中獲取日期 ）我已經看到，也許這是因為我需要授權才能拾取PHAssets。

因此，我將第一段代碼更改為：

@IBAction func importButtonPressed(_ sender: Any) {

        let status = PHPhotoLibrary.authorizationStatus()

        switch status {
        case .authorized:
            PHPhotoLibrary.requestAuthorization({status in
                if status == .authorized {
                    self.imagePicker.sourceType = .photoLibrary
                    self.imagePicker.allowsEditing = true
                    self.imagePicker.mediaTypes = [kUTTypeMovie as String, kUTTypeImage as String]

                    self.present(self.imagePicker,animated: true, completion: nil)
                }
            })
        case .denied:
            print("denied")
        // probably alert the user that they need to grant photo access
        case .notDetermined:
            print("not determined")
        case .restricted:
            print("restricted")
            // probably alert the user that photo access is restricted
        }

    }

但是現在當我按下導入按鈕時，它會因lldb錯誤而崩潰：

libsystem_kernel.dylib`__abort_with_payload:
    0x1854f7040 <+0>:  mov    x16, #0x209
    0x1854f7044 <+4>:  svc    #0x80
->  0x1854f7048 <+8>:  b.lo   0x1854f7060               ; <+32>
    0x1854f704c <+12>: stp    x29, x30, [sp, #-0x10]!
    0x1854f7050 <+16>: mov    x29, sp
    0x1854f7054 <+20>: bl     0x1854d8bdc               ; cerror_nocancel
    0x1854f7058 <+24>: mov    sp, x29
    0x1854f705c <+28>: ldp    x29, x30, [sp], #0x10
    0x1854f7060 <+32>: ret    

很明顯，我沒有正確地做到這一點。 我應該怎么做？

Answer 1

崩潰是由於以下缺少訪問照片庫的權限所致，

該應用已崩潰，因為它嘗試訪問沒有使用說明的隱私敏感數據。 該應用程序的Info.plist必須包含一個NSPhotoLibraryUsageDescription鍵，該鍵具有字符串值，該字符串值向用戶說明該應用程序如何使用此數據。

在您的Info.plist ，添加帶有以下描述的NSPhotoLibraryUsageDescription鍵，它將正常工作

編輯您還應該按照以下適當方式使用PhotoLibrary授權。

@IBAction func importButtonPressed(_ sender: Any) {

    PHPhotoLibrary.requestAuthorization({status in
        switch status {
        case .authorized:
            self.imagePicker.sourceType = .photoLibrary
            self.imagePicker.allowsEditing = true
            self.imagePicker.mediaTypes = [kUTTypeMovie as String, kUTTypeImage as String]

            self.present(self.imagePicker,animated: true, completion: nil)
        case .denied:
            print("denied")
        // probably alert the user that they need to grant photo access
        case .notDetermined:
            print("not determined")
        case .restricted:
            print("restricted")
            // probably alert the user that photo access is restricted
        }
    })
}