- (IBAction)logIn {
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    if ([username text] != nil && [password text] != nil) {
        [defaults setValue:[username text] forKey:@"sa_username"];
        [defaults setValue:[password text] forKey:@"sa_password"];
        sa.username = [username text];
        sa.password = [password text];
        [sa login];
    }
}