iOS: Select picture from camera or library

MyViewController

class MyViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    ...
 
    @IBOutlet weak var pictureImage: UIImageView!
 
    let picker = UIImagePickerController()
 
    ...
 
    override func viewDidLoad() {
        super.viewDidLoad()
     
        picker.delegate = self
     
        ...
    }

    ...

    // MARK: - Actions     @IBAction func changePictureAction(_ sender: Any) {
        ...
        changePhoto()
    }

    ...

    func changePhoto() {
     
        let optionMenu = UIAlertController(title: nil, message: "Lets get a picture", preferredStyle: .actionSheet)
     
        let selectFromLibraryAction = UIAlertAction(title: "Select photo from library", style: .default, handler: {
            (alert: UIAlertAction!) -> Void in
            self.selectPictureFromLibrary()
        })
        optionMenu.addAction(selectFromLibraryAction)
     
        if (UIImagePickerController .isSourceTypeAvailable(UIImagePickerControllerSourceType.camera)) {
            let takePictureAction = UIAlertAction(title: "Take a picture", style: .default, handler: {
                (alert: UIAlertAction!) -> Void in
                self.selectPictureFromCamera()
            })
            optionMenu.addAction(takePictureAction)
        }
     
        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: {
            (alert: UIAlertAction!) -> Void in
            print("Cancelled")
        })
        optionMenu.addAction(cancelAction)
     
        self.present(optionMenu, animated: true, completion: nil)
    }
 
    func selectPictureFromLibrary() {
        picker.sourceType = .photoLibrary
        present(picker, animated: true, completion: nil)
    }
 
    func selectPictureFromCamera() {
        picker.sourceType = .camera
        present(picker, animated: true, completion: nil)
    }
 
...

// MARK: - UIImagePickerControllerDelegate
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
    {
        let chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage
        pictureImage.contentMode = .scaleAspectFit
        pictureImage.image = chosenImage
        dismiss(animated:true, completion: nil)
    }
 
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        dismiss(animated: true, completion: nil)
    }    
}

Info.plist

Key: Privacy - Photo Library Usage Description
Type: String
Value: <you message>

Key: Privacy - Camera Usage Description
Type: String
Value: <you message>