Question

I am doing an application which include a userlogin,only the user login then only it will redirected to the main page.But i want to do a one time login like the facebook login or ebay login that if the user singin ,the username needs to be maintain,no further login is needed,but if the application delete from the iphone then its ok.now my application needs login when the application is deleted from the iphone memeory(multitasking).How to set up a one time login for my application?
Regards
Nipin

Answer 1

Passwords and other sensitive user data should be stored in the keychain. The API for the keychain is plain C and available by linking agains the Security framework.

This API is somewhat cumbersome to work with. I usually use the excellent Objective-C wrapper by Buzz Andersen available at github.

The normal workflow for a one time login app is to use a startup similar to this pseudocode:

if (stored password exists) {
   if (login with stored password succeeds) {
      exit, we are done
   } else {
      remove password from secure storage
   }
}
if (user provides new password) {
   if (login with user provided password success) {
      store user provided password in secure storage
   }
}