Create iOS alert controller for image and video selection, from camera or filesystem

ImagePicker.swit

class ImagePicker: UIViewController, UINavigationControllerDelegate {
    
    @IBOutlet var pictureView: UIImageView!
    
    func tapAddPicture(_ sender: Any) {
        let imagePickerController = UIImagePickerController()
        imagePickerController.delegate = self
        imagePickerController.mediaTypes = ["public.image", "public.movie"]
        let actionSheet = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
        actionSheet.addAction(UIAlertAction(title: "Take Photo", style: .default, handler: { (action:UIAlertAction) in
            if UIImagePickerController.isSourceTypeAvailable(.camera) {
                imagePickerController.sourceType = .camera
                self.present(imagePickerController, animated: true, completion: nil)
            } else {
                self.showAlert(withTitle: "Missing camera", andMessage: "You can't take photo, there is no camera.")
            }
        }))
        actionSheet.addAction(UIAlertAction(title: "Choose From Library", style: .default, handler: { (action:UIAlertAction) in
            imagePickerController.sourceType = .photoLibrary
            self.present(imagePickerController, animated: true, completion: nil)
        }))
        actionSheet.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
        if pictureView.image != nil {
            actionSheet.addAction(UIAlertAction(title: "Remove Photo", style: .destructive, handler: {(_ action: UIAlertAction) -> Void in
                self.pictureView.image = nil
            }))
        }
        present(actionSheet, animated: true, completion: nil)
    }
    
    func showAlert(withTitle title: String, andMessage message: String) {
        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
        let defaultAction = UIAlertAction(title: "OK", style: .default, handler: {(_ action: UIAlertAction) -> Void in
        })
        alert.addAction(defaultAction)
        present(alert, animated: true, completion: {() -> Void in
            alert.view.tintColor = UIColor.green
        })
    }
}

ImagePickerXT.swift

extension ImagePicker: UIImagePickerControllerDelegate {
    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        print(info)
        let mediaType = info["UIImagePickerControllerMediaType"] as! String
        switch mediaType {
        case "public.movie":
            print("Movie selected!")
            // TODO: Load video
            picker.dismiss(animated: true, completion: nil)
            break
        case "public.image":
            print("Image selected!")
            let image = info[UIImagePickerControllerOriginalImage] as! UIImage
            self.pictureView.image = image
            picker.dismiss(animated: true, completion: nil)
            break
        default:
            picker.dismiss(animated: true, completion: nil)
            return
        }
    }
    
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        picker.dismiss(animated: true, completion: nil)
    }
}