core-animation

I have a CAShapeLayer in which an arc is added using UIBezierPath . I saw a couple of posts (one actually) here on stackoverflow but none seemed to give me the answer. As said in the title I would like to animate an arc (yes it will be for a pie chart). How can one accomplish an animation from an "empty" arc to the fully extended one? Kinda like a curved progress bar. Is it really impossible to do it via CoreAnimation ? Here's how I "do" the arc. Oh and ignore the comments and calculation since I'm used to counter clockwise unit circle and apple goes clockwise. The arcs appear just fine, I

I need to animate 3 UIViews (fade in/out). 1 animation duration is 0.6s (fade in/out cycle is 0.6+0.6s). But I need to launch animations in 0.2 seconds. 1st animation should be launched in 0.0 seconds. 2nd animation should be launched in 0.2 seconds. 3rd animation should be launched in 0.4 seconds. And all of them should be looped "indefinitely" (until some trigger). What I have at the moment: - (void)playAnimation { isAnimated = YES; [self animateView:firstView afterDelay:0.0]; [self animateView:secondView afterDelay:0.2]; [self animateView:thirdView afterDelay:0.4]; } - (void)stopAnimation {

I have a scrollView with paging enabled and a number N of pages, which are UIViews as subviews of the scrollView. I'm trying to do the following: User scrolls to page number n. At that point, 7 CALayers which were previously added to page number n (that is, to page [[scrollView subviews] objectAtIndex:n-1].layer subLayers]) fade in, one after the other. But I can't figure out how to make the CALayers fadeIn sequentially.So far, I've tried the following 3 approaches from my controller's delegate method: (assume I have an array to the layers and that their opacity was set to 0 upon creation) -

I have a UIImageView and want it to be displayed with a specific blend mode. I know the iPhone has different blend modes, and it's probably possible to do it with a lot of CG code… but maybe there's a nice way with the CALayer of UIImageView ? humasect see here: composite colors: CALayer and blend mode on iPhone Set the compositingFilter of a view's layer to a supported blend mode string. From the docs, a layer's compositingFilter is A CoreImage filter used to composite the layer and the content behind it. To obtain a list of Core Image filters, print out the filter names defined by a

Sorry for a big question, real question are bold in bottom, now some explanation. I'm use CoreAnimation in my project for animate some objects moving like this. CABasicAnimation *moveAnimation; moveAnimation=[CABasicAnimation animationWithKeyPath:@"position"]; moveAnimation.duration = 2.0; moveAnimation.repeatCount=1; moveAnimation.autoreverses=NO; moveAnimation.delegate = self; moveAnimation.fromValue = [NSValue valueWithCGPoint:[crawler.layer position]]; moveAnimation.fillMode = kCAFillModeForwards; moveAnimation.removedOnCompletion = NO; CGPoint p; moveAnimation.toValue = [NSValue