core-animation

I am creating an app that involves animating lines within a workspace over time. My current approach for this is to use code like this in drawRect : CGContextSetStrokeColor(context, black); CGContextBeginPath(context); CGContextMoveToPoint(context, startPoint.x, startPoint.y); CGContextAddLineToPoint(context, finalPoint.x, finalPoint.y); CGContextStrokePath(context); ...and then just setting a timer to run every 0.05 seconds to update finalPoint and call setNeedsDisplay . I'm finding this approach (when there's 5ish lines moving at once) slows down the app terribly, and even with such a high

i am applying CABasicAnimation for position property of a layer it is animating well but after animation complete its coming back to original position how to avoid that and to make image to stay in animated position only? Andrew Zimmer There are a few different ways to solve this. My favorite is to set the object at the end of the animation, and use fromValue instead of toValue to create the animation. You can also set both fromValue and toValue to create this effect. ie CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"position"]; animation.duration = 1.0; animation

Ever since their introduction in iOS 4, I have been wondering about the internal implementation of the UIView 's block-based animation methods. In particular I would like to understand what mystical features of Objective C are used there to capture all the relevant layer state changes before and after execution of the animation block. Observing the black-box implementation, I gather that it needs to capture the before-state of all layer properties modified in the animation block, to create all the relevant CAAnimations . I guess it does not do a snapshot of whole view hierarchy, as that would

Only one day left on the bounty! Can you have a custom animatable property work with the UIView animateWithDuration block syntax? I've been working on creating my own implicit animation for a custom animatable property on a custom CALayer . I have set the backing layer of a custom UIView and can use a CATransaction to animate the custom property (in the custom example I am changing the color of a circle with a custom property circleColor ). I know that UIView turns off animatable properties by returning NSNull from the actionForLayer:forKey: selector method on UIView . Then when the property

We've had Reiner Knizia's Money out for a couple of months now. It's done pretty well, and so we've been updating it as time allows. However, one thing continues to bug me. I've never been able to get my layered cards to anti-alias correctly. Here's a sample: Cards that are laid straight are very clean, but whenever they're angled the black lines around the cards get jagged. I've tried this depending on both lines implicit to the artwork and lines drawn through drawRect:, and they both do the same thing. I've tried the edgeAntiAliasingMask and it doesn't do a thing as far as I can tell. I've

I want to set the strokeEnd property of a CAShapeLayer without the default animation, with no animation at all. I've looked around to try to find how to do this but everything seems to be about how to animate properties. David Rönnqvist In Core Animations terminology, a more general term for an animation is an "action". You can for example see that the CAAnimation conforms to the CAAction protocol. You also see the terminology "action" used when disabling them (disabling the animations). There are many different ways of changing the actions of a layer. Many of them are documented pretty well