I have an animated shadow path of a CALayer:
CABasicAnimation* shadowAnimation = [CABasicAnimation animationWithKeyPath: #"shadowPath"];
shadowAnimation.duration = duration;
shadowAnimation.timingFunction = function;
shadowAnimation.fromValue = (id) panelView.layer.shadowPath;
panelView.layer.shadowPath = [UIBezierPath bezierPathWithRoundedRect: CGRectSetOriginM20 (panelView.bounds, CGPointZero) cornerRadius: cornerRadius].CGPath;
[panelView.layer addAnimation: shadowAnimation forKey: #"shadow"];
panelView.layer.shadowOpacity = 1.0;
I need to recreate the same effect using an asset by settings the CALayer's content property to a UIImage. Is there a way to make the bounds follow the same animation as the shadow?
No, you can't make the content follow the shadow path.
Instead you have to animate the shadow path and the bounds together. This can be done in an animation group so that you only can configure the timing function and duration on the group.
CAAnimationGroup* shadowAndBounds = [CAAnimationGroup animation];
shadowAndBounds.duration = duration;
shadowAndBounds.timingFunction = function;
CABasicAnimation* shadowAnimation = [CABasicAnimation animationWithKeyPath: #"shadowPath"];
// Set to and from value for the shadow path ...
CABasicAnimation* boundsAnimation = [CABasicAnimation animationWithKeyPath: #"bounds"];
// Set to and from value for the bounds ...
shadowAndBounds.animations = #[ shadowAnimation, boundsAnimation ];
[panelView.layer addAnimation: shadowAndBounds forKey: #"shadowAndBounds"];
Related
I want to show a few images using CAKeyframeAnimation, how can I perform transitions between images? Or how can I add CATransition to the animation? Such as: image1 eases out then image2 eases in, image2 fades out then image3 fades in, etc
CAKeyframeAnimation :
- (void)animateImages
{
CAKeyframeAnimation *keyframeAnimation = [CAKeyframeAnimation animationWithKeyPath:#"contents"];
keyframeAnimation.values = self.imagesArray;
keyframeAnimation.repeatCount = 1.0f;
keyframeAnimation.duration = kAnimationDuration; // static const with your value
keyframeAnimation.delegate = self;
keyframeAnimation.removedOnCompletion = NO;
keyframeAnimation.fillMode = kCAFillModeForwards;
CALayer *layer = self.animationImageView.layer;
[layer addAnimation:keyframeAnimation
forKey:#"girlAnimation"];
}
One layer for one image works good. I can add animation at the begin/end of every layer to show in/out transition.
I'm trying to animate a path and with the changing of it's points, as shown in the keyframes below. So, the top two points move down to the bottom and the middle point moves to the top, essentially flipping it's direction.
Here's the code I'm using to create the path:
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, nil, 1.0f, 8.0f);
CGPathAddLineToPoint(path, nil, 7.0f, 1.5f);
CGPathAddLineToPoint(path, nil, 13.0f, 8.0f);
shapeLayer = [[CAShapeLayer alloc] init];
shapeLayer.path = path;
shapeLayer.strokeColor = pathColor.CGColor;
shapeLayer.fillColor = [NSColor clearColor].CGColor;
shapeLayer.lineWidth = 2.0f;
[self.layer addSublayer: shapeLayer];
However, I've also got little idea of how to actually animate the points. All the information about animating paths online is simply changing the path start, not the actual point.
Is there a way - or a different approach - to do this? Thanks in advance.
You can animate the path of the shape layer from one path to another.
In your case you would create the paths for the initial state and for the end state as two different paths.
Note: if your two paths have a different number of segments or control points, the animation will look very strange.
Then you would create an animation for the "path" key path with those to and from values and add it to the layer you are animating. If you also want the property to change to the end state you should also update the path property to reflect the end state of the animation.
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:#"path"];
animation.duration = 1.0; // however long your duration should be
animation.fromValue = (__bridge id)fromPath;
animation.toValue = (__bridge id)toPath;
shapeLayer.path = toPath; // the property should reflect the end state of the animation
[shapeLayer addAnimation:animation forKey:#"myPathAnimation"];
I am working on a circular progress bar that i've created using UIBezierPath. The progress bar looks like the following picture:
My question is: how to make the edge of the arc rounded and not rectangular?
The code i used to draw the arc looks like is:
// Draw the arc with bezier path
int radius = 100;
arc = [CAShapeLayer layer];
arc.path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(100, 50) radius:radius startAngle:M_PI endAngle:M_PI/150 clockwise:YES].CGPath;
arc.position = CGPointMake(CGRectGetMidX(self.view.frame)-radius,
CGRectGetMidY(self.view.frame)-radius);
arc.fillColor = [UIColor clearColor].CGColor;
arc.strokeColor = [UIColor purpleColor].CGColor;
arc.cornerRadius = 0.5;
arc.lineWidth = 6;
[self.view.layer addSublayer:arc];
// Animation of the progress bar
drawAnimation = [CABasicAnimation animationWithKeyPath:#"strokeEnd"];
drawAnimation.duration = 5.0; // "animate over 10 seconds or so.."
drawAnimation.repeatCount = 1.0; // Animate only once..
drawAnimation.removedOnCompletion = YES; // Remain stroked after the animation..
drawAnimation.fromValue = [NSNumber numberWithFloat:0.0f];
drawAnimation.toValue = [NSNumber numberWithFloat:10.0f];
drawAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
[arc addAnimation:drawAnimation forKey:#"drawCircleAnimation"];
I tried to use arc.cornerRadius but it seemed to return nothing.
Any help would be appreciated.
Thank you in advance!
Granit
Set lineCapStyle to kCGLineCapRound (On the bezier path) to draw the ends of the lines with a round edge.
You can also set the lineCap on the shape layer to do the same thing.
To make corner as round you can use this.
arc.lineCap = #"round";
The swift equivalent is:
let circlePath = UIBezierPath(…)
circlePath.lineCapStyle = .round
Maybe someone can point me in the right direction. I tried Google but dont really know how to define my question in searchable terms.
I am animating an image along a UIBezierPath like this:
UIBezierPath *trackPath = [UIBezierPath bezierPath];
[trackPath moveToPoint:P(8, 250)];
[trackPath addCurveToPoint:P(318, 250)
controlPoint1:P(156, 86)
controlPoint2:P(166, 412)];
[trackPath addCurveToPoint:P(652, 254)
controlPoint1:P(488, 86)
controlPoint2:P(512, 412)];
[trackPath addCurveToPoint:P(992, 254)
controlPoint1:P(818, 96)
controlPoint2:P(872, 412)];
CALayer *bee = [CALayer layer];
bee.bounds = CGRectMake(0, 0, 69, 71);
bee.position = P(160, 25);
bee.contents = (id)([UIImage imageNamed:#"bee3.png"].CGImage);
[self.view.layer addSublayer:bee];
What I want to do is animate the image itself as it moving along the path. I can animate the image when its b itself with like this:
NSArray *blueArray = [NSArray array];
blueArray = [[NSArray alloc] initWithObjects:
[UIImage imageNamed:#"blue1.png"],
[UIImage imageNamed:#"blue2.png"], nil];
blueFly.animationImages = blueArray;
blueFly.animationDuration = 0.20;
blueFly.animationRepeatCount = -1;
[blueFly startAnimating];
How can I combine the two, so to speak?
Additionally I know how to draw the path itself onto the screen like this:
CAShapeLayer *beeline = [CAShapeLayer layer];
beeline.path = trackPath.CGPath;
beeline.strokeColor = [UIColor whiteColor].CGColor;
beeline.fillColor = [UIColor clearColor].CGColor;
beeline.lineWidth = 2.0;
beeline.lineDashPattern = [NSArray arrayWithObjects:[NSNumber numberWithInt:6], [NSNumber numberWithInt:2], nil];
[self.view.layer addSublayer:beeline];
But how can I draw the line only behind the image as its being animated along the path?
You can use a CAShapeLayer to display the path. A shape layer provides two properties strokeStart and strokeEnd that have values between 0 and 1 and determine the fraction of the path that is visible. By animating strokeEnd you can create the impression that the path is "drawn" on the screen. See http://oleb.net/blog/2010/12/animating-drawing-of-cgpath-with-cashapelayer for an example that animates a pen that draws a line.
In order to change the image of the bee you can simply add an animation that changes the contents of your bee layer. For example, to change the image of the pen in the CAShapeLayer project above, we can add the following code to the startAnimation method.
CAKeyframeAnimation *imageAnimation = [CAKeyframeAnimation animationWithKeyPath:#"contents"];
imageAnimation.duration = 1.0;
imageAnimation.repeatCount = HUGE_VALF;
imageAnimation.calculationMode = kCAAnimationDiscrete;
imageAnimation.values = [NSArray arrayWithObjects:
(id)[UIImage imageNamed:#"noun_project_347_1.png"].CGImage,
(id)[UIImage imageNamed:#"noun_project_347_2.png"].CGImage,
nil];
[self.penLayer addAnimation:imageAnimation forKey:#"contents"];
This simply adds a key animation to the contents property of the layer that displays the pen. Note that the image "noun_project_347_1.png" is not part of the project so you would have to add an image to see the effect. I have simply horizontally flipped the image that comes with the project. By setting calculationMode to kCAAnimationDiscrete the animation does not interpolate between two images by replaces one by the other.
As long as you can get the exact path that you want to animate the image align you can do it using Core Animation and CAKeyframeAnimation.
Refer how-to-animate-one-image-over-the-unusual-curve-path-in-my-ipad-application) link.
I want to rotate the image around the x-axis from left to right. The problem is that when you rotate the image covers the button located on the top
Run animation
[AnimationUtil rotationRightToLeftForView:image andDuration:1];
Animation metod
+(void) rotationRightToLeftForView:(UIView *)flipView andDuration:(NSTimeInterval)duration{
// Remove existing animations before stating new animation
[flipView.layer removeAllAnimations];
// Make sure view is visible
flipView.hidden = NO;
// show 1/2 animation
//flipView.layer.doubleSided = NO;
// disable the view so it’s not doing anythign while animating
flipView.userInteractionEnabled = NO;
// Set the CALayer anchorPoint to the left edge and
// translate the button to account for the new
// anchorPoint. In case you want to reuse the animation
// for this button, we only do the translation and
// anchor point setting once.
if (flipView.layer.anchorPoint.x != 0.0f) {
flipView.layer.anchorPoint = CGPointMake(0.0f, 0.5f);
flipView.center = CGPointMake(flipView.center.x-flipView.bounds.size.width/2.0f, flipView.center.y);
}
// create an animation to hold the page turning
CABasicAnimation *transformAnimation = [CABasicAnimation animationWithKeyPath:#"transform"];
transformAnimation.removedOnCompletion = NO;
transformAnimation.duration = duration;
transformAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
// start the animation from the current state
transformAnimation.fromValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];
// this is the basic rotation by 180 degree along the y-axis M_PI
CATransform3D endTransform = CATransform3DMakeRotation(radians(180.0), 0.0f, -1.0f, 0.0f);
transformAnimation.toValue = [NSValue valueWithCATransform3D:endTransform];
// Create an animation group to hold the rotation
CAAnimationGroup *theGroup = [CAAnimationGroup animation];
// Set self as the delegate to receive notification when the animation finishes
theGroup.delegate = self;
theGroup.duration = duration;
// CAAnimation-objects support arbitrary Key-Value pairs, we add the UIView tag
// to identify the animation later when it finishes
[theGroup setValue:[NSNumber numberWithInt:flipView.tag] forKey:#"viewFlipTag"];
// Here you could add other animations to the array
theGroup.animations = [NSArray arrayWithObjects:transformAnimation, nil];
theGroup.removedOnCompletion = NO;
// Add the animation group to the layer
[flipView.layer addAnimation:theGroup forKey:#"flipView"];
}
The decision follows:
Create mask (image) Color = black, make region Size = Button.size Color = transparent
image name = "mask2.png"
button = ...;
ImageView = ...;
parent_view = ...;
UIImage *_maskingImage = [UIImage imageNamed:#"mask2"];
CALayer *_maskingLayer = [CALayer layer];
_maskingLayer.frame = parent_View.bounds;
[_maskingLayer setContents:(id)[_maskingImage CGImage]];
CALayer *layerForImage = [[CALayer alloc] init];
layerForImage.frame = parent_View.bounds;
[layerForImage setMask:_maskingLayer];
[layerForImage addSublayer:ImageView.layer];
[parent_View.layer addSublayer:layerForImage];
[parent_View addSubView:button];