How to implement image animation via an invisible UIslider?

I got a question is using UISlider to control a image animation

And this image has invisible slider to cover on it ...

It looks like this

My question is ... how to adjust image angle ,when I开发者_C百科 change my slide value ???

So that's I can let the image animation from left pic to right pic ???

Thanks

Webber

upload the sample code Here

Hope someone can help me to figure out this problem

---

Do you want to rotate the image? Then use:

imageView.transform =  GAffineTransformRotate(imageView.transform,RADIANS(degreesToRotate));

---

- (IBAction)changeSliderValue:(id)sender{
    int progressAsInt =(int)(invisibleSlider.value);
    if (progressAsInt==0) {
        [dimmerImg setImage:[UIImage imageNamed:@"slider0.png"]];
    }
    else {
        [dimmerImg setImage:[UIImage imageNamed:@"slider99.png"]];
        CGAffineTransform transform = CGAffineTransformIdentity;
        dimmerImg.transform = CGAffineTransformRotate(transform, progressAsInt * M_PI / 180);
        //dimmerImg.transform = CGAffineTransformRotate(dimmerImg.transform, progressAsInt);
    }
}

This works fine ~