在swift 4中访问相机和照片库

Question

我正在尝试使用以下代码访问swift4中的相机和照片库

let imagePickerController = UIImagePickerController()
    imagePickerController.delegate = self
    let alert = UIAlertController(title: "", message: "", preferredStyle: .actionSheet)
    alert.addAction(UIAlertAction(title: "Camera", style: .default, handler: {(action: UIAlertAction) in
        imagePickerController.sourceType = .camera
        print(1)
    }))
    alert.addAction(UIAlertAction(title: "Photo Album", style: .default, handler: {(action: UIAlertAction) in
        imagePickerController.sourceType = .photoLibrary
    }))
    alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: nil))
    self.present(alert, animated: true, completion: nil)

但它不起作用。即使我确保plist具有相机和照片库授权，我也没有获得访问授权请求。我稍微操纵了一下代码

AVCaptureDevice.requestAccess(for: AVMediaType.video) { response in
    }
    let photos = PHPhotoLibrary.authorizationStatus()
    if photos == .notDetermined {
        PHPhotoLibrary.requestAuthorization({status in
        })
    }

    let imagePickerController = UIImagePickerController()
    imagePickerController.delegate = self
    let alert = UIAlertController(title: "", message: "", preferredStyle: .actionSheet)
    alert.addAction(UIAlertAction(title: "Camera", style: .default, handler: {(action: UIAlertAction) in
        imagePickerController.sourceType = .camera
        print(1)
    }))
    alert.addAction(UIAlertAction(title: "Photo Album", style: .default, handler: {(action: UIAlertAction) in
        imagePickerController.sourceType = .photoLibrary
    }))
    alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: nil))
    self.present(alert, animated: true, completion: nil)

现在我收到了摄像机和照片库的授权请求，我可以看到AlertView但是当我按下相机或相册时，如图所示没有任何反应。

我尝试了相机的设备和模拟器。

Answer 1

错误：您需要呈现uiimagePickerViewController。在这里，我提供修改后的代码来解决您的问题。我也加了一些检查。

 //Show alert
func showAlert() {

    let alert = UIAlertController(title: "", message: "", preferredStyle: .actionSheet)
    alert.addAction(UIAlertAction(title: "Camera", style: .default, handler: {(action: UIAlertAction) in
        self.getImage(fromSourceType: .camera)
    }))
    alert.addAction(UIAlertAction(title: "Photo Album", style: .default, handler: {(action: UIAlertAction) in
        self.getImage(fromSourceType: .photoLibrary)
    }))
    alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: nil))
    self.present(alert, animated: true, completion: nil)
}

//get image from source type
func getImage(fromSourceType sourceType: UIImagePickerControllerSourceType) {

    //Check is source type available
    if UIImagePickerController.isSourceTypeAvailable(sourceType) {

        let imagePickerController = UIImagePickerController()
        imagePickerController.delegate = self
        imagePickerController.sourceType = sourceType
        self.present(imagePickerController, animated: true, completion: nil)
    }
}

注意：不要忘记在info.plist中添加隐私设置

隐私 - 相机使用说明

隐私 - 照片库使用说明

Answer 2

首先，您需要导入此库：

import Photos
import UserNotifications
import UIKit

 @IBOutlet weak var loadPhoto: UIButton!

你需要设置委托：

class YourClass: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UNUserNotificationCenterDelegate 

func displayUploadImageDialog(btnSelected: UIButton) {
    let picker = UIImagePickerController()
    picker.delegate = self
    picker.allowsEditing = true
    let alertController = UIAlertController(title: "", message: "Upload profile photo?".localized(), preferredStyle: .actionSheet)
    let cancelAction = UIAlertAction(title: NSLocalizedString("Cancel", comment: "Cancel action"), style: .cancel, handler: {(_ action: UIAlertAction) -> Void in
        alertController.dismiss(animated: true) {() -> Void in }
    })
    alertController.addAction(cancelAction)
    let cameraRollAction = UIAlertAction(title: NSLocalizedString("Open library".localized(), comment: "Open library action"), style: .default, handler: {(_ action: UIAlertAction) -> Void in
        if UI_USER_INTERFACE_IDIOM() == .pad {
            OperationQueue.main.addOperation({() -> Void in
                picker.sourceType = .photoLibrary
                self.present(picker, animated: true) {() -> Void in }
            })
        }
        else {
            picker.sourceType = .photoLibrary
            self.present(picker, animated: true) {() -> Void in }
        }
    })
    alertController.addAction(cameraRollAction)
    alertController.view.tintColor = .black
    present(alertController, animated: true) {() -> Void in }
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    let image = info[UIImagePickerControllerOriginalImage] as! UIImage
    profileImage.image = image
    let imageData = UIImageJPEGRepresentation(image, 0.05)
    self.dismiss(animated: true, completion: nil)
}

func checkPermission() {
    let authStatus = AVCaptureDevice.authorizationStatus(for: AVMediaType.video)
    switch authStatus {
    case .authorized:
        self.displayUploadImageDialog(btnSelected: self.loadPhoto)
    case .denied:
        print("Error")
    default:
        break
    }
}

func imagePickerControllerDidCancel(picker: UIImagePickerController) {
    self.dismiss(animated: true, completion: nil)
}

func checkLibrary() {
    let photos = PHPhotoLibrary.authorizationStatus()
    if photos == .authorized {
        switch photos {
        case .authorized:
            self.displayUploadImageDialog(btnSelected: self.loadPhoto)
        case .denied:
            print("Error")
        default:
            break
        }
    }
}

按钮的设置操作：

@IBAction func loadPhotoTapped(_ sender: UIButton) {
    let photos = PHPhotoLibrary.authorizationStatus()
    if photos == .notDetermined {
        PHPhotoLibrary.requestAuthorization({status in
            if status == .authorized{
                print("OKAY")
            } else {
                print("NOTOKAY")
            }
        })
    }
    checkLibrary()
    checkPermission()
}

在Info.plist中设置权限：

隐私 - 媒体库使用说明

隐私 - 照片库使用说明

隐私 - 相机使用说明

这应该工作。