wzio

/// The authentication state.
enum AuthenticationState: StateType {
    
    // A list of events.
    enum Event {
        case userSignIn(email: String, password: String)
        case accessTokenReceived(AccessToken)
        case userReceived(User)
        case userSignedOut
    }

wzio

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [[NSNotificationCenter defaultCenter]
            addObserver:self
            selector:@selector(keyboardWillChangeFrame:)
            name:UIKeyboardWillChangeFrameNotification object:nil];
}

- (void)viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];