Question

I’m currently working on an app that uses the SSO login from Facebook. I’ve followed the tutorial on their developer website for iOS and now I have a working login and logout system 🙂

However, every time when I startup the app, the session is not valid (anymore) and it’s asking me to authorize the app. Is it possible that the session keeps valid, even after I closed the app, and how would I implement that? I’ve already tried the following code:

// Restore previously saved Facebook credentials (If any)
delegate.facebook.accessToken    = [[NSUserDefaults standardUserDefaults] stringForKey:@"FBAccessToken"];
delegate.facebook.expirationDate = (NSDate *) [[NSUserDefaults standardUserDefaults] objectForKey:@"FBExpirationDate"];

// Trigger SSO Facebook authentication if required
if ([delegate.facebook isSessionValid] == NO) {
    [delegate.facebook authorize:nil];
} else {
    [self fbLoginWithUsername:username andPassword:password];
}

But still it’s asking me to authorize. It’s very annoying for users to see the authorization window every time they login. Does anyone have an idea about this?

Thanks in advance!

Answer 1

Ensure that the NSUserDefaults string you use for the accessToken is not nil and that you are saving it correctly.