Setting up your email in iOS 7 is just like setting it up in earlier versions of iOS. Just like before, you are able to have Gmail set up in the Mail app. To set up your email you would go to Settings, then tap on Mail, Contacts & Calendars, and then press Add Account. By default in iOS, Gmail is set to archive your emails as opposed to deleting them. Archiving email keeps the messages in an Archived folder, but Deleting moves them to the trash.
If you are viewing your inbox, and you swipe from right to left on the message, you do not get the option to delete the message. Rather, you get an Archive option or a More option. The More option gives you every other option except for deleting the message. You could always tap on More, then press Move Message, and then choose the Trash folder. That’s rather tedious for a simple task:
Even when you try viewing the body of the message, you do not have a delete option, rather the button right above the home button, is a blue box. When you press that blue box it archives the message as oppose to deleting the message and putting it in Trash.
Under your settings, you can change archiving to delete for Gmail. In iOS 6, this was a lot easier because all you had to do was tap on your account in Settings and turn the Archive Messages switch off.
In iOS 7, to change it so that way the emails will delete, go into Settings, tap on Mail, Contacts & Calendars and tap on your Gmail account that is listed.
Then tap on Account.
Down at the bottom tap on Advanced. You are going to change where it says “Move Discarded Messages Into:” by tapping on the word Deleted Mailbox.
Now that I turned on Deleted Mailbox, whenever I go to delete a message I will now have that option to delete the message and put it in the trash.