title: iPhone Objective-C: Ensure user allows location sharing before doing other actions
body: <p>My application asks for location at the log in screen, and right now, the user can log in without sharing his or her location. When the user selects "No" for sharing location, an error that reads <code>Error Domain=kCLErrorDomainCode=1 "The operation couldn't be completed. (kCLErrorDomain error 1.)"</code> is thrown. I'm guessing that's because I am trying to access latitude and longitude without having such things. </p>
  
  <p>My question is, how do I make sure that a user allows location before anything else can be done? Is there a way to create a new "Allow Location" pop-up request?</p>
  
  <p>Thanks in advance! </p>