title: Using Parse user queries in Swift
body: <p>I am making a Swift iOS app using Parse.</p>
  
  <p>An existing user needs to be able to enter their email address (which will be their username) and then the updatedAt information will be displayed.</p>
  
  <p>How do setup the PFUser.Query() to create a variable to store the relevant updatedAt information.</p>
  
  <p>Basically I want to say: If entered email address equals existing email address then display the updatedAt information.</p>
  
  <p>Thank you!</p>