cabasicanimation

问题 I am trying to rotate a CAShapeLayer by an angle from its current angle whenever a button is pressed. I am using delegate function animationDidStop to set the transform of the layer during end of animation, since I have noticed animation only changes the transform of the presentation layer and not the layer in itself. But there are random flickering in the animation which seems to be during the end of the animation when the animation is complete due to layer going back to its previous

问题 I have the following CABasicAnimation run in my viewDidLoad for a view controller inside a UINavigationController : CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; animation.duration = 1; animation.additive = NO; animation.removedOnCompletion = NO; animation.fillMode = kCAFillModeForwards; animation.fromValue = [NSNumber numberWithFloat:0]; animation.toValue = [NSNumber numberWithFloat:-1*(((-windBearing+180) * M_PI) / 180)]; [compass.layer

问题 I'm stuck on animating 2 images that scroll on the iPhone view horizontally infinitely. The background can not have any gaps in it. If this can be done with just 1 image that would be great but I can't seem to get it. Here's the code I have so far: -(void)moveImages { CABasicAnimation *theAnimation; theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.translation.x"]; theAnimation.duration=10; theAnimation.repeatCount=100; theAnimation.autoreverses=NO; theAnimation.fromValue=

问题 Don't refer CABasicAnimation returns to the original position before the next animation and Objective-C - CABasicAnimation applying changes after animation? and CABasicAnimation rotate returns to original position i have tried. below code does,bottom->top->goes left->back to it’s original position. bottom->top->goes left->back to its original position. I need bottom->top->goes left.bottom->top->goes left so on… -(void)addUpDownAnimationForButton:(UILabel*)label { CABasicAnimation *

问题 I can detect a touch of a CAShapeLayer like this (touchesEnded): let touchLocation : CGPoint = (touch as! UITouch).locationInView(self.view) for shape in shapes{ if CGPathContainsPoint(shape.path, nil, touchLocation, false){ print("Layer touch") } } And I can animate the path of a CAShapeLayer like this: let newShapePath = UIBezierPath(arcCenter: toPoint, radius: 20, startAngle: CGFloat(0), endAngle: CGFloat(M_PI * 2), clockwise: true).CGPath // animate the `path` let animation =

问题 This is the code I’m using to animate my CAShapeLayer : _progressBarLayer.strokeEnd = CGFloat(_progressToDrawForProgress(progress)) let progressAnimation = CABasicAnimation(keyPath: "strokeEnd") progressAnimation.duration = CFTimeInterval(1.0) progressAnimation.fromValue = CGFloat(self.progress) progressAnimation.toValue = _progressBarLayer.strokeEnd progressAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseIn) _progressBarLayer.addAnimation(progressAnimation,

问题 I am stuck at animating the uiLabel in my view. Actually I just want to animate my label/Text on a circular path. I have searched a lot over internet but couldn't find any good tutorial or example that is doing something like my problem. I have done CAShapeLayer (circle) increasing from 0 to its maximum value.... Similarly I want that my label/text start moving from initial point in circular path and come back to its initial point after completing one circle. Hope I have explained my problem

问题 I am very new to iOS and I need to do following animation: Transformation of the circle to rectangle should be smooth, but in above animation it's not very smooth. What I did is create a circle and a rectangle using following code in this tutorial: Circle : class OvalLayer: CAShapeLayer { let animationDuration: CFTimeInterval = 0.3 override init() { super.init() fillColor = Colors.red.CGColor path = ovalPathSmall.CGPath } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has

问题 I am using CABasicanimation for rotate an UIView. I am using this code, CABasicAnimation *rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; NSNumber *currentAngle = [CircleView.layer.presentationLayer valueForKeyPath:@"transform.rotation"]; rotationAnimation.fromValue = currentAngle; rotationAnimation.toValue = @(50*M_PI); rotationAnimation.duration = 50.0f; // this might be too fast rotationAnimation.repeatCount = HUGE_VALF; // HUGE_VALF is defined in math

问题 I am a bit of a beginner with animations and have been experimenting with CoreAnimation for a couple of days. Feel free to warn me if this question does not make sense, but I'm trying to achieve the following. I have three objects: one should be an image, moving according to a given pattern one should be an UIImage that swaps two images one should be a text (CATextLayer?) whose content changes The three actions should happen in sync. As an example, think about a programme showing a sinusoid