iOS: How to authenticate a user after login (for auto login)?

Question

I\'d like to use an auto-login function. So when the user opens the app, he gets delegated to a \"login screen\". When he logged in successfully he should be directed to his acc

Answer 1

I used a combination of NSUserDefaults and SSKeychain. I used NSUserDefaults to store the username nad SSKeychain to store the password.

This is the code I used to save the credentials

NSString *user = self.username.text;
NSString *password = self.pass.text;
[SSKeychain setPassword:password forService:@"achat" account:user];
NSUserDefaults *dUser = [NSUserDefaults standardUserDefaults];
[dUser setObject:user forKey:@"user"];
[dUser synchronize];

This is the code I used to retrieve the credentials

NSUserDefaults *eUser = [NSUserDefaults standardUserDefaults];
NSString *savedUser = [eUser objectForKey:@"user"];

    if (!savedUser) {
        UIAlertView *uhoh = [[UIAlertView alloc] initWithTitle:@"Oops!" message:@"Please enter your username and password." delegate:self cancelButtonTitle:@"Okay" otherButtonTitles:nil, nil];
        [uhoh show];
    }

    else {
            NSString *savedPass = [SSKeychain passwordForService:@"achat" account:savedUser];
            self.username.text = savedUser;
            self.pass.text = savedPass;
         }