title: Checking If user is logged in or not
body: <p>I'm new to iOS development and to the AWS Amplify framework. I am currently working my way through the Authentication documentation, but it isn't clear how to check the logged-in status of a given user. I only want to display the login form if the user not already logged in. How do I achieve this? There doesn't seem to be any information listed in the docs, and the only resource I found from google applied to a different platform (react).</p>