core-animation

I am wondering what makes Layers different from Views, when every View comes along with it's own Layer. Maybe I am wrong with that. But then: What are these Layers good for? Like I understand it, I would use an UIView to group elements in my GUI. I could also use that UIView to position things over other things. So where come Layers into place here? Should I think of them just as the z-index like in HTML / CSS? Are they just interesting for Core Animation stuff? Compared to UIVIews, CALayers are lightweight filled with timing information for animation Some things are harder to draw, like text

How to animate/move the view in the curve path, is it possible to do using UIAnimation. Like moving a view in the path as in the image. Julio Gorgé You can do it using Core Animation and CAKeyFrameAnimation to define the curve points. See this tutorial: http://nachbaur.com/2011/01/07/core-animation-part-4/ Above one can be achived by:- i) CAKeyframeAnimation ii) Create Curve Path iii)Animate layer of Custom View import UIKit import CoreGraphics class ViewController: UIViewController { var moveAlongPath:CAAnimation! override func viewDidLoad() { super.viewDidLoad() addAnimation()

My goal is to understand and implement feature via Core Animation. I think it's not so hard,but unfortunately i don't know swift/Obj C and it's hard to understand native examples. Visual implementation So what exactly i want to do(few steps as shown on images): 1. 2. 3. 4. And the same steps to hide view(vice versa,from top to bottom) until this : Also,i want to make this UIView more generic,i mean to put this UIView on my StoryBoard and put so constraints on AutoLayout(to support different device screens). Any ideas? Thanks! You can use like this Extension extension UIView{ func animShow(){

I have some CGPath (a poly with two circle) carried out on a CAShapeLayer . Can I trim/subtract paths like this? Instead of do the math, the result can be achieved at drawing time using kCGBlendModeClear . // Create the poly. CGContextBeginPath(context); CGContextMoveToPoint (context, a_.x, a_.y); CGContextAddLineToPoint (context, b_.x, b_.y); CGContextAddLineToPoint (context, c_.x, c_.y); CGContextAddLineToPoint (context, d_.x, d_.y); CGContextClosePath(context); // Draw with the desired color. CGContextSetFillColorWithColor(context, self.color.CGColor); CGContextFillPath(context); // Create

I am wondering if there is a way to do this using Core Animation. Specifically, I am adding a sub-layer to a layer-backed custom NSView and setting its delegate to another custom NSView. That class's drawInRect method draws a single CGPath: - (void)drawInRect:(CGRect)rect inContext:(CGContextRef)context { CGContextSaveGState(context); CGContextSetLineWidth(context, 12); CGMutablePathRef path = CGPathCreateMutable(); CGPathMoveToPoint(path, NULL, 0, 0); CGPathAddLineToPoint(path, NULL, rect.size.width, rect.size.height); CGContextBeginPath(context); CGContextAddPath(context, path);

I'm trying to create a "page curl" animation of an image in my iPhone application. I t UIViewAnimationTransitionCurlUp, and it's undocumented Core Animation siblings, however the image I need to animate is a transparent PNG, with "uneven" (some alpha pixels) outlines. When using the aforementioned pre-made transition, those alpha pixels are painted black as soon as the animation starts, which looks terribly ugly. Therefore, I seek to create a Core Animation of my own. I have tried to research the subject, but have been unable to find a good overview of the techniques involved. The

I want to animate the position of a CALayer based on a CGPath, but I want to play it backwards. Is there any way to animate a path backwards, or reverse a CGPath? animation.speed = -1; ? This may not be the best solution, but it worked for me. I told the animation to autoreverse, then started it halfway in. But to prevent it from animating back again I needed to terminate it early. - (void) animate { CAKeyframeAnimation * pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"]; pathAnimation.path = path; pathAnimation.duration = 15.0; pathAnimation.calculationMode =