Similar to Password Manager apps, you need to develop a similar app using Scroll View, buttons, text field to keep emails. The button positions in the scroll view should be in two-column format (big emails, small delete buttons), as seen below. The buttons should be big enough to fill the width of screen appropriately. The email addresses should be sorted. Once the user touches an email button, the app should forward to this address to Mail and an “compose” view should be appear on the device (remember UIApplication.sharedApplication().openURL(url) from Password Manager App). if Mail app is not setup in the simulator, then it does not starts giving an error, it is an acceptable status. The X (delete) button should delete the email address next to it.
Requirements: Use iOS 12 as deployment target, and make sure that your project compatible with Xcode 10.