Apple developed Swift to make developer's more expressive and efficient yet they do not provide simple controls like this. Can't tell you how many hours I wasted in the chat portion of my app trying to get a simple growing text input to work!
Try this out and let us know what you think. It's been designed in a way where you shouldn't care about the growing text input and trivial features related to it, but to build your tableView/collectionView cells and content.
