core-animation

I am looking for a little guidance to start figuring out an animation that tracks finger movement and moves a collection of UIButtons along the outer path of a circle I am picturing it will kind of have a revolver feel to it. Like each one locks into place at the bottom or like the swiping through one of the slide inserts of these thanks in advance (Sample code on GitHub ) It's not really that difficult, there's just a lot of trigonometry involved. Now, what I'm going to describe now, is not an animation , since you requested for it to track the position of your finger in the title. An

This is essentially the same question as posted here: Animating a custom property in a CALayer over a year ago and hasn't been answered. Im creating a custom layer and drawing a circle on it. I'd like to be able to animate the radius of the circle (and other properties later). From what i've read, i've set it up like so: public class CircleLayer : CALayer { //[Export("radius")] //public float Radius { get;set; } //EDIT: I've now changed the radius field to what is coded below public float Radius; [Export("radius")] public float getRadius() { return Radius; } [Export("setRadius:")] public void

I'm trying to animate CAShapeLayar's strokeColor property. I looked throught the documentation and it was stated that it is an animatable property. The code is working for animating postion.y but not the the strokeColor. I'll be happy to get any kind of help or advice The code I've used: lyr.fillColor = [[UIColor clearColor] CGColor]; lyr.lineWidth = 3.8; lyr.strokeColor = [[UIColor yellowColor] CGColor]; lyr.position = CGPointMake(160, 431); lyr.anchorPoint = CGPointMake(.5f, .5f); [self.view.layer addSublayer:lyr]; CABasicAnimation *basicAnimation = [CABasicAnimation animationWithKeyPath:@

I am attempting to modify the contentOffset of my scroll within the following delegate method: - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate I have tried both of the following: [UIView animateWithDuration:.2 animations:^ { [scrollView setContentOffset:CGPointZero animated:NO]; }]; and [UIView animateWithDuration:.2 animations:^ { CGRect svBounds = self.bounds; svBounds.origin.y = 0; self.bounds = svBounds; }]; The problem is that although this changes the offset right away (proven by logs after the animation is complete), it doesn't change the

I am recieving memory warning using 100 of animating images so I tried to use Core Animation instead but that gives me the same problem. This is because I don't know how to use replaceSublayer in my current code UIView* upwardView=[[UIView alloc]init]; [upwardView setFrame:CGRectMake(0, 0, 1024, 768)]; [self.view addSubview:upwardView]; NSArray *animationImages=[NSArray arrayWithObjects:[UIImage imageNamed:@"001.png"],[UIImage imageNamed:@"001.png"],[UIImage imageNamed:@"002.png"],[UIImage imageNamed:@"003.png"],....,nil]; CAKeyframeAnimation *animationSequence = [CAKeyframeAnimation

Could someone please provide me with an example of animating the opacity of an Image View in swift?? I couldn't even find a good example in objective c func showCorrectImage(element: AnyObject){ var animation : CABasicAnimation = CABasicAnimation(keyPath: "opacity"); animation.delegate = self animation.fromValue = NSValue(nonretainedObject: 0.0) animation.toValue = NSValue(nonretainedObject: 1.0) animation.duration = 1.0 element.layer?.addAnimation(animation, forKey: nil) } I think I have most of this right (not completely sure though), could someone please help me? element = an Image View

I have a drawing app and I would like for my users to be able to use particle effects as part of their drawing. Basically, the point of the app is to perform custom drawing and save to Camera Roll or share over the World Wide Web. I encounted the CAEmitterLayer class recently, which I reckon would be a simple and effective way to add particle effects. I have been able to draw the particles onscreen in the app using the CAEmitterLayer implementation. So rendering onscreen works fine. When I go about rendering the contents of the drawing using CGContextRef context =

The following code animates the movement, even though I didn't use beginAnimations:context . How do I get it to move without animating? This is a new iphone view project, and these are the only updates to it. // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { [super viewDidLoad]; sublayer = [CALayer new]; sublayer.backgroundColor = [[UIColor redColor] CGColor]; sublayer.frame = CGRectMake(0, 0, 100, 100); [self.view.layer addSublayer:sublayer]; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { sublayer.position