How to create a Animated Menu in iPhone or iPad?

-(IBAction)btnMenu_TouchUpInside:(id)sender{
[self.view bringSubviewToFront:viewMenu];
UIButton* btnSelect = (UIButton*)sender;
btnSelect.selected = !(btnSelect.selected);

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];

if(btnSelect.selected)
{
[viewMenu setAlpha:1.0];
}
else
{
[viewMenu setAlpha:0.0];
}
[UIView commitAnimations];
}