private void ShowLoginView()
{
// If the login screen is not already displayed, display it. If the login screen is
// displayed, then getting back here means the login in progress did not successfully
// complete. In that case, notify the login view so it can update its UI appropriately.
if (loginViewController == null)
{
CreateAndPresentLoginView();
}
else
{
loginViewController.LoginFailed();
}
}
