core-animation

For my understanding, beginTime can be used to say "hey, start at exactly 12:00 'o clock". But how would I tell this with an CFTimeInterval type? I thought that this one is nothing more than a kind of "float" value to specify seconds. Or what else would be then the difference to the timeOffset property that is specified in CAMediaTiming protocol? What I missed in the docs: beginTime is in "core animation absolute time" so you've to get the current time and specify your offset from that: // Start in 5 seconds theAnimation.beginTime = CACurrentMediaTime()+5; Chris You first need to convert to

I'm porting a block of code from an iOS4 project to iOS5 and I'm having some troubles with ARC. The code generates a PDF from a screen capture. PDF Generation Code UIView *captureView; ... NSMutableData *pdfData = [NSMutableData data]; UIGraphicsBeginPDFContextToData(pdfData, captureView.bounds, nil); UIGraphicsBeginPDFPage(); CGContextRef pdfContext = UIGraphicsGetCurrentContext(); [captureView.layer renderInContext:pdfContext]; UIGraphicsEndPDFContext(); The renderInContext line [captureView.layer renderInContext:pdfContext]; generates the following error. Automatic Reference Counting issue

How can I add a bounce effect when I am about to show an UIImageView as a subview? Do I have to use CoreAnimation to do this? My only guess right now is to use CAKeyframeAnimation, please let me know if there's a better way. Here's my current code: CABasicAnimation * theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.translation.y"]; theAnimation.delegate = self; theAnimation.duration = 1.0; theAnimation.fromValue = [NSNumber numberWithFloat:notif.center.y]; theAnimation.toValue = [NSNumber numberWithFloat:notif.center.y-20]; theAnimation.repeatCount = 3; y-axis animation using

I have many icons in my app and I would like to animate them in a manner similar to what happens when you try to delete applications from the iPhone's home screen. How can you do this? Additionally, is there a way to have the icons animate up onto the screen in a manner similar to what happens when you unlock the iPhone? If you want to make your views, images, etc. wobble, like the home screen, you could do something like this: CGAffineTransform leftWobble = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(-15.0)); CGAffineTransform rightWobble = CGAffineTransformRotate

I don't really like that flip-transition. It's boring. I'd like to see something cool, like water effect, fog, or whatever. Is there something available or do I have to (re)invent the wheel for that? The animation types available via [CATransition animation] are: kCATransitionFade kCATransitionPush kCATransitionMoveIn kCATransitionReveal @"suckEffect" @"spewEffect" @"genieEffect" @"unGenieEffect" @"rippleEffect" @"twist" @"tubey" @"swirl" @"charminUltra" @"zoomyIn" @"zoomyOut" The transition types available via [UIView setAnimationTransition:forView:cache:] are:

Objective I am attempting to create an animated approximation of human writing, using a UIBezierPath generated from a glyph. I understand and I have read the many UIBezierPath questions which sound similar to mine (but are not the same). My goal is to create an animation that approximates the look of a human performing the writing of characters and letters. Background I've created a playground that I am using to better understand paths for use in animating glyphs as if they were drawn by hand. A couple of concepts in the Apple CAShapeLayer (strokeStart and strokeEnd) really don't seem to

I've made a CALayer with an added CATextLayer and the text comes out blurry. In the docs, they talk about "sub-pixel antialiasing", but that doesn't mean much to me. Anyone have a code snippet that makes a CATextLayer with a bit of text that is clear? Here's the text from Apple's documentation: Note: CATextLayer disables sub-pixel antialiasing when rendering text. Text can only be drawn using sub-pixel antialiasing when it is composited into an existing opaque background at the same time that it's rasterized. There is no way to draw subpixel-antialiased text by itself, whether into an image or

I am trying to build an animated pie chart that can animate the pie in both directions depending on whether the value of its progress increases or decreases. I've started with sample code provided here and made some adjustments as suggested here . The trouble is that the back-animation is not yet quite working. It only partially clears the pie. I am not quite sure whether this is due to me using animations incorrectly or calculating coordinates incorrectly, for if I insert CGContextSetFillColorWithColor(context, UIColor.redColor.CGColor); into the first if branch and change blend mode to

I'm trying start another animation when one ends. I am checking for callbacks like this: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(animationDidStopNotification:) name:ImageAnimatorDidStopNotification object:animatorViewController]; How do I make an if statement that lets me do trigger something when ImageAnimatorDidStopNotification is received? Thanks! You didn't post enough code to know what are you trying to do and where is the problem. If you want to chain two (or more) animations with UIKit, try using setAnimationDidStopSelector: selector. - (void