How to add custom animatable property to UIImageView's subclass?

I have the class that I subclassed from UIImageView. The instance of this class is then added as a subview to the my application's root class. Now, I can animate it's properties, for example, setFrame:

[UIView beginAnimations:nil context:nil];
...
[myImageView setFrame:someFrameCreatedInCode];
...
[UIView commitAnimations];

This takes the current frame as the initial state and interpolates imageview animation (it simply moves from the left to the right). This part works fine.

What I would like to do next is I want to add a property to my class, say, of integer type. And I want this propert开发者_JS百科y to cpecify the image number (it's name is formatted) and make frame based animation later. It seems to be a nice way to create animation because I can specify the "curve" to affect the animation timing:

[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

How to implement my own property which is possible to animate?

Thanks in advance!

Update: In case someone will need this I found these tutorials in the Internet: blog post, sample.

You'd probably want to use the UIView animations together with the UIImageView animation images.

If you use a code like this:

colors = [[NSArray alloc] initWithObjects:[UIImage imageNamed:@"red_select1.png"],
                        [UIImage imageNamed:@"red_select2.png"],
                        [UIImage imageNamed:@"red_select3.png"],
                        [UIImage imageNamed:@"red_select4.png"],
                        [UIImage imageNamed:@"red_select5.png"],
                        [UIImage imageNamed:@"red_select6.png"],
                        [UIImage imageNamed:@"red_select7.png"],    
                        [UIImage imageNamed:@"red_select8.png"],nil];

animationView = [[UIImageView alloc] initWithFrame:rect];

animationView.animationImages = colors;
animationView.animationDuration = 1.0;
animationView.animationRepeatCount = 0; // loop

[animationView startAnimating];

I think the only problem would be synchronizing the two animations ...