notification center keyboard observer

snippet.m

- (void)enableKeyboardNotifications
{
    NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];
    
    [defaultCenter addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [defaultCenter addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)keyboardWillShow:(NSNotification *)aNotification
{
}

- (void)keyboardWillHide:(NSNotification *)aNotification
{
}