Problem with simple animation - iphone

Question

I am using animation on a button click first time show a view and second ti me hide a view.
here is my code for hiding a view
-(IBAction)clickme
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[UIView setAnimationDelegate:self];
[view1 setAlpha:0.0];
[UIView commitAnimations];
}
similar code is there for showing the view.
But the problem arises when user click the button many times again and again....means i am using 2 seconds for my animation but if user presses the same button in during the animation then the output result is very bad.
I don't want to disable that button during the period of animation.
Is there any other way?

Answer 1

You need to keep track of whether there's an animation going on, and ignore the click if it is.
Declare an instance variable BOOL animating; in your class header, and initialise it to NO in your init.
Then,
-(IBAction)clickme
{
if (animating) return;
animating = YES;
[UIView beginAnimations:nil context:self];
[UIView setAnimationDuration:0.3];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[UIView setAnimationDelegate:self];
[view1 setAlpha:0.0];
[UIView commitAnimations];
}
- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
if (context == self)
animating = NO;
}

Answer 2

try to use + (void)setAnimationBeginsFromCurrentState:(BOOL)fromCurrentState:
-(IBAction)clickme
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[UIView setAnimationDelegate:self];
[view1 setAlpha:0.0];
[UIView commitAnimations];
}