actionSheet-gist

let alertController: UIAlertController = UIAlertController(title: "Pick an option", message: nil, preferredStyle: .actionSheet)
let cancelActionButton = UIAlertAction(title: "Cancel", style: .cancel) {
    _ in
}
alertController.addAction(cancelActionButton)
let imageGalleryAction = UIAlertAction(title: "Choose from Gallery", style: .default)
{
    [weak self] _ in
    self?.pickVideo(from: UIImagePickerController.SourceType.photoLibrary)
}
alertController.addAction(imageGalleryAction)
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerController.SourceType.camera) {
    let cameraAction = UIAlertAction(title: "Take a Video", style: .default)
    {
        [weak self]_ in
        self?.pickVideo(from: UIImagePickerController.SourceType.camera)
    }

    alertController.addAction(cameraAction)
}
self.present(alertController, animated: true)