PyTorch-Actionsheet.swift

@objc func showActionSheet(sender: UIButton)
    {
        let alert = UIAlertController(title: "Select Image", message: nil, preferredStyle: .actionSheet)
        alert.addAction(UIAlertAction(title: "Camera", style: .default, handler: { _ in
            self.launchCamera()
        }))
        
        alert.addAction(UIAlertAction(title: "Photos Library", style: .default, handler: { _ in
            self.showPhotosLibrary()
        }))
        
        alert.addAction(UIAlertAction.init(title: "Cancel", style: .cancel, handler: nil))
        switch UIDevice.current.userInterfaceIdiom {
        case .pad:
            alert.popoverPresentationController?.sourceView = sender
            alert.popoverPresentationController?.sourceRect = sender.bounds
            alert.popoverPresentationController?.permittedArrowDirections = .up
        default:
            break
        }
        
        self.present(alert, animated: true, completion: nil)
    }
    
    func launchCamera()
    {
        if UIImagePickerController.isSourceTypeAvailable(.camera){
            let imagePicker = UIImagePickerController()
            imagePicker.sourceType = .camera
            imagePicker.delegate = self
            self.present(imagePicker, animated: true, completion: nil)
        }
        else{
            let alert  = UIAlertController(title: "Warning", message: "There's no camera.", preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: "Dismiss", style: .default, handler: nil))
            self.present(alert, animated: true, completion: nil)
        }
    }
    
    func showPhotosLibrary(){
        let imagePicker = UIImagePickerController()
        imagePicker.sourceType = .photoLibrary
        imagePicker.delegate = self
        self.present(imagePicker, animated: true, completion: nil)
    }