Checking if user already exists

gistfile1.txt

if (indexPath.row == 4) {
		
		NSString *username = [[NSUserDefaults standardUserDefaults] objectForKey:@"username"];
		NSString *password = [[NSUserDefaults standardUserDefaults] objectForKey:@"password"];
		
		if (username && password) {
			// User already exists. Go Directly to ever note view controller.
		}else {
			// User has not logged in. Go to ever note login view controller.
			Evernotelogin *evernoteView = [[Evernotelogin alloc] initWithNibName:@"Evernotelogin"
																		  bundle:nil];
			[self.navigationController pushViewController:evernoteView animated:YES];
			[evernoteView release];
		}
	}