When choosing and image from the photo lib or camera how to handle isSourceTypeAvailable

Code Block 
		func chooseImage()
		{
				let imagePicker = UIImagePickerController()
				imagePicker.delegate = self
				if UIImagePickerController.isSourceTypeAvailable(.photoLibrary)
				{
						PHPhotoLibrary.requestAuthorization({ (status) in
								switch status
								{
								case .authorized:
										DispatchQueue.main.async {
												imagePicker.sourceType = .photoLibrary
												imagePicker.allowsEditing = self.cropStatus
												self.present(imagePicker, animated: true)
										}
								case .notDetermined:
										DispatchQueue.main.async {
												imagePicker.sourceType = .photoLibrary
												imagePicker.allowsEditing = self.cropStatus
												self.present(imagePicker, animated: true)
										}
								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)
										settingsAlert.addAction(settingsAction)
										settingsAlert.addAction(cancelAction)
										self.present(settingsAlert, animated: true)
								default:
										return
								}
						})
				}
		}

Code Block 
import UIKit
import SystemConfiguration
extension UIView {
		//MARK: - Send a confirmation alert
		func sendConfirmationAlert(theTitle: String, theMessage: String?, buttonTitle: String)
		{
				let theAlert = UIAlertController.init(title: theTitle, message: theMessage, preferredStyle: .alert)
				let theAction = UIAlertAction(title: buttonTitle, style: .default)
				theAlert.addAction(theAction)
				//present it on controller
				let window = UIApplication.shared.windows.first { $0.isKeyWindow }
				if let navController = window?.rootViewController as? UINavigationController
				{
						navController.present(theAlert, animated: true)
				}
		}
}