title: salesforce login in ios native App
body: <p>I am quite new to iOS and i am trying to post something from my App on salesforce(like we share something on twitter). For that i want to first display the login screen if user is already not logged in and if user is logged in he can post on salesforce from  my app. Please guide me to a tutorial or some sample code. i have done a hell lot of searching on web but didn't find any good tutorial. i have already added the SDK to my project but not able to figure out how implement all this. </p>
  
  <p>Thank you.</p>