I have one this scenario:
I add to a layer CAAnimation that transforms it to a specific frame. with a starting time of 0.
Then I add another CAAnimation that transforms it to a different frame. with a starting time of 0.5.
what happens is that the layer immediately gets the second frame (with no animation) and after the first animation time passes the second animation is completed correctly.
This is the animation creation code:
+ (CAAnimation *)transformAnimation:(CALayer *)layer
fromFrame:(CGRect)fromFrame
toFrame:(CGRect)toFrame
fromAngle:(CGFloat)fromAngle
toAngle:(CGFloat)toAngle
anchor:(CGPoint)anchor
vertical:(BOOL)vertical
begin:(CFTimeInterval)begin
duration:(CFTimeInterval)duration {
CATransform3D fromTransform = makeTransform(layer, fromFrame, fromAngle, anchor, vertical);
CATransform3D midTransform1 = makeTransformLerp(layer, fromFrame, toFrame, fromAngle, toAngle, anchor, 0.33, vertical);
CATransform3D midTransform2 = makeTransformLerp(layer, fromFrame, toFrame, fromAngle, toAngle, anchor, 0.66, vertical);
CATransform3D toTransform = makeTransform(layer, toFrame, toAngle, anchor, vertical);
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:#"transform"];
animation.values = #[[NSValue valueWithCATransform3D:fromTransform],
[NSValue valueWithCATransform3D:midTransform1],
[NSValue valueWithCATransform3D:midTransform2],
[NSValue valueWithCATransform3D:toTransform]
];
animation.beginTime = begin;
animation.duration = duration;
animation.fillMode = kCAFillModeBoth;
animation.calculationMode = kCAAnimationPaced;
animation.removedOnCompletion = NO;
return animation;
}
EDIT
in most scenarios, this code works well and the animations are sequenced correctly. But if I set 1 transform animation to start after 2 seconds and then set another transform to start after 4 seconds. the first transform is applied immediately to the layer and the second animation starts from there.
Any Idea how can I separate the animation to run one after the other?
(I prefer not using a completion block)
Thanks
The easiest and most glaring early fix would be to change the fill mode so that the second animation is not clamped on both ends overriding the previous animation.
animation.fillMode = kCAFillModeForwards;
Also I would adjust the begin time to be
animation.beginTime = CACurrentMediaTime() + begin;
If it is a matter of overlapping begin times and durations and not this let me know and I can provide that as well.
I have a CAEmitterLayer and I'd like to have a simple animation run over the course of each particle's life.
As soon as particle pops in, I'd like it to scale up to about 1.2, then after a short time have it scale back to 1.0 and stay that way until it's lifetime expires.
I know about the scale, scaleRange and scaleSpeed properties of the CAEmitterCell but they're way too random for what I need.
Is this possible to do? I've tried adding a CABasicAnimation like this (my CAEmitterCell's name is "heart"):
CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:#"emitterCells.heart.scale"];
anim.fromValue = #(1.0);
anim.toValue = #(2.0);
anim.duration = 3.0;
anim.fillMode = kCAFillModeForwards;
anim.repeatCount = CGFLOAT_MAX;
[self.heartsEmitter addAnimation:anim forKey:#"scaleAnimation"];
but it doesn't work, the particles just appear at a random scale, they don't animate at all.
I'm not completely sure, but it seems to me that you are applying the animation to the emitter instead of the cells.
If the CAEmitterCell's name is heart try this: [self.heart addAnimation:anim forKey:#"scaleAnimation"];. Does this help?
I'm trying to put together an animation that works a little like a speedometer.
The first animation gets the needle
CFTimeInterval localMediaTime = [needle convertTime:CACurrentMediaTime() fromLayer:nil];
CABasicAnimation *needAni = [CABasicAnimation animationWithKeyPath:#"transform.rotation.z"];
needAni.duration = 0.5f;
needAni.fromValue = [NSNumber numberWithFloat:0.0];
needAni.toValue = [NSNumber numberWithFloat:(rotVal * M_PI / 180.0)];
needAni.timingFunction = [CAMediaTimingFunction functionWithControlPoints:0.195: 0.600: 0.790: 0.405];
needAni.fillMode = kCAFillModeBackwards;
[needle.layer addAnimation:needAni forKey:nil];
After that plays I would like to have the needle bounce back and forth a little when its reached full speed. This animation does just that:
CABasicAnimation *needAni2 = [CABasicAnimation animationWithKeyPath:#"transform.rotation.z"];
needAni2.duration = 0.1f;
needAni2.fromValue = [NSNumber numberWithFloat:(rotVal * M_PI / 180.0)];
needAni2.toValue = [NSNumber numberWithFloat:((rotVal+5) * M_PI / 180.0)];
needAni2.fillMode = kCAFillModeBackwards;
needAni2.autoreverses = YES;
needAni2.repeatCount = HUGE_VAL;
needAni2.beginTime = localMediaTime + 0.5f;
[needle.layer addAnimation:needAni2 forKey:nil];
Now when I put this together only the second animation plays.
I tired putting these two animations into a group, but I can't seem to just repeat the second animation, it repeats the whole process. Is there a performance problem if I put the group duration equal to HUGE_VAL or is there a better way to do this?
Thanks
I think you can just stick with your method, as this seems to be the intended usage of CAGroupAnimation. Just make sure you set an appropriate duration for the group. If you make the duration for the group shorter than your intended animations, it will cut your animations short. If you make the duration longer than your animations, the animation objects might possibly linger in memory until that duration is over.
Another option would be to implement the delegate method -animationDidStop:finished: , and add the second animation when that gets called by the first animation.
CAAnimation reference:
https://developer.apple.com/library/ios/#documentation/GraphicsImaging/Reference/CAAnimation_class/Introduction/Introduction.html#//apple_ref/occ/cl/CAAnimation
I am using the following CABasicAnimation. But, its very slow..is there a way to speed it up ? Thanks.
- (void)spinLayer:(CALayer *)inLayer duration:(CFTimeInterval)inDuration
direction:(int)direction
{
CABasicAnimation* rotationAnimation;
// Rotate about the z axis
rotationAnimation =
[CABasicAnimation animationWithKeyPath:#"transform.rotation.z"];
// Rotate 360 degress, in direction specified
rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 * direction];
// Perform the rotation over this many seconds
rotationAnimation.duration = inDuration;
// Set the pacing of the animation
rotationAnimation.timingFunction =
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
// Add animation to the layer and make it so
[inLayer addAnimation:rotationAnimation forKey:#"rotationAnimation"];
}
Core Animation animations can repeat a number of times, by setting the repeatCount property on the animation.
So if you'd like to have an animation run for a total 80 seconds, you need to figure out a duration for one pass of the animation – maybe one full spin of this layer – and then set the duration to be that value. Then let the animation repeat that full spin several times to fill out your duration.
So something like this:
rotationAnimation.repeatCount = 8.0;
Alternatively, you can use repeatDuration to achieve a similar affect:
rotationAnimation.repeatDuration = 80.0;
In either case, you need to set the duration to the time of a single spin, and then repeat it using ONE of these methods. If you set both properties, the behavior is undefined. You can check out the documentation on CAMediaTiming here.
I am rotating a CALayer and trying to stop it at its final position after animation is completed.
But after animation completes it resets to its initial position.
(xcode docs explicitly say that the animation will not update the value of the property.)
any suggestions how to achieve this.
Here's the answer, it's a combination of my answer and Krishnan's.
cabasicanimation.fillMode = kCAFillModeForwards;
cabasicanimation.removedOnCompletion = NO;
The default value is kCAFillModeRemoved. (Which is the reset behavior you're seeing.)
The problem with removedOnCompletion is the UI element does not allow user interaction.
I technique is to set the FROM value in the animation and the TO value on the object.
The animation will auto fill the TO value before it starts, and when it's removed will leave the object at it's correct state.
// fade in
CABasicAnimation *alphaAnimation = [CABasicAnimation animationWithKeyPath: #"opacity"];
alphaAnimation.fillMode = kCAFillModeForwards;
alphaAnimation.fromValue = NUM_FLOAT(0);
self.view.layer.opacity = 1;
[self.view.layer addAnimation: alphaAnimation forKey: #"fade"];
Core animation maintains two layer hierarchies: the model layer and the presentation layer. When the animation is in progress, the model layer is actually intact and keeps it initial value. By default, the animation is removed once the it's completed. Then the presentation layer falls back to the value of the model layer.
Simply setting removedOnCompletion to NO means the animation won't be removed and wastes memory. In addition, the model layer and the presentation layer won't be synchronous any more, which may lead to potential bugs.
So it would be a better solution to update the property directly on the model layer to the final value.
self.view.layer.opacity = 1;
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:#"opacity"];
animation.fromValue = 0;
animation.toValue = 1;
[self.view.layer addAnimation:animation forKey:nil];
If there's any implicit animation caused by the first line of above code, try to turn if off:
[CATransaction begin];
[CATransaction setDisableActions:YES];
self.view.layer.opacity = 1;
[CATransaction commit];
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:#"opacity"];
animation.fromValue = 0;
animation.toValue = 1;
[self.view.layer addAnimation:animation forKey:nil];
Reference:
Animations Explained by objc.io.
"iOS 7 Programming Pushing the Limits" by Rob Napier and Mugunth Kumar.
Set the following property:
animationObject.removedOnCompletion = NO;
You can simply set the key of CABasicAnimation to position when you add it to the layer. By doing this, it will override implicit animation done on the position for the current pass in the run loop.
CGFloat yOffset = 30;
CGPoint endPosition = CGPointMake(someLayer.position.x,someLayer.position.y + yOffset);
someLayer.position = endPosition; // Implicit animation for position
CABasicAnimation * animation =[CABasicAnimation animationWithKeyPath:#"position.y"];
animation.fromValue = #(someLayer.position.y);
animation.toValue = #(someLayer.position.y + yOffset);
[someLayer addAnimation:animation forKey:#"position"]; // The explicit animation 'animation' override implicit animation
You can have more information on 2011 Apple WWDC Video Session 421 - Core Animation Essentials (middle of the video)
just put it inside your code
CAAnimationGroup *theGroup = [CAAnimationGroup animation];
theGroup.fillMode = kCAFillModeForwards;
theGroup.removedOnCompletion = NO;
A CALayer has a model layer and a presentation layer. During an animation, the presentation layer updates independently of the model. When the animation is complete, the presentation layer is updated with the value from the model. If you want to avoid a jarring jump after the animation ends, the key is to keep the two layers in sync.
If you know the end value, you can just set the model directly.
self.view.layer.opacity = 1;
But if you have an animation where you don't know the end position (e.g. a slow fade that the user can pause and then reverse), then you can query the presentation layer directly to find the current value, and then update the model.
NSNumber *opacity = [self.layer.presentationLayer valueForKeyPath:#"opacity"];
[self.layer setValue:opacity forKeyPath:#"opacity"];
Pulling the value from the presentation layer is also particularly useful for scaling or rotation keypaths. (e.g. transform.scale, transform.rotation)
So my problem was that I was trying to rotate an object on pan gesture and so I had multiple identical animations on each move. I had both fillMode = kCAFillModeForwards and isRemovedOnCompletion = false but it didn't help. In my case, I had to make sure that the animation key is different each time I add a new animation:
let angle = // here is my computed angle
let rotate = CABasicAnimation(keyPath: "transform.rotation.z")
rotate.toValue = angle
rotate.duration = 0.1
rotate.isRemovedOnCompletion = false
rotate.fillMode = CAMediaTimingFillMode.forwards
head.layer.add(rotate, forKey: "rotate\(angle)")
This works:
let animation = CABasicAnimation(keyPath: "opacity")
animation.fromValue = 0
animation.toValue = 1
animation.duration = 0.3
someLayer.opacity = 1 // important, this is the state you want visible after the animation finishes.
someLayer.addAnimation(animation, forKey: "myAnimation")
Core animation shows a 'presentation layer' atop your normal layer during the animation. So set the opacity (or whatever) to what you want to be seen when the animation finishes and the presentation layer goes away. Do this on the line before you add the animation to avoid a flicker when it completes.
If you want to have a delay, do the following:
let animation = CABasicAnimation(keyPath: "opacity")
animation.fromValue = 0
animation.toValue = 1
animation.duration = 0.3
animation.beginTime = someLayer.convertTime(CACurrentMediaTime(), fromLayer: nil) + 1
animation.fillMode = kCAFillModeBackwards // So the opacity is 0 while the animation waits to start.
someLayer.opacity = 1 // <- important, this is the state you want visible after the animation finishes.
someLayer.addAnimation(animation, forKey: "myAnimation")
Finally, if you use 'removedOnCompletion = false' it'll leak CAAnimations until the layer is eventually disposed - avoid.
Without using the removedOnCompletion
You can try this technique:
self.animateOnX(item: shapeLayer)
func animateOnX(item:CAShapeLayer)
{
let endPostion = CGPoint(x: 200, y: 0)
let pathAnimation = CABasicAnimation(keyPath: "position")
//
pathAnimation.duration = 20
pathAnimation.fromValue = CGPoint(x: 0, y: 0)//comment this line and notice the difference
pathAnimation.toValue = endPostion
pathAnimation.fillMode = kCAFillModeBoth
item.position = endPostion//prevent the CABasicAnimation from resetting item's position when the animation finishes
item.add(pathAnimation, forKey: nil)
}
Simply setting fillMode and removedOnCompletion didn't work for me. I solved the problem by setting all of the properties below to the CABasicAnimation object:
CABasicAnimation* ba = [CABasicAnimation animationWithKeyPath:#"transform"];
ba.duration = 0.38f;
ba.fillMode = kCAFillModeForwards;
ba.removedOnCompletion = NO;
ba.autoreverses = NO;
ba.repeatCount = 0;
ba.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(0.85f, 0.85f, 1.0f)];
[myView.layer addAnimation:ba forKey:nil];
This code transforms myView to 85% of its size (3rd dimension unaltered).
#Leslie Godwin's answer is not really good, "self.view.layer.opacity = 1;" is done immediately (it takes about one second), please fix alphaAnimation.duration to 10.0, if you have doubts.
You have to remove this line.
So, when you fix fillMode to kCAFillModeForwards and removedOnCompletion to NO, you let the animation remains in the layer. If you fix the animation delegate and try something like:
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag
{
[theLayer removeAllAnimations];
}
...the layer restores immediately at the moment you execute this line. It's what we wanted to avoid.
You must fix the layer property before remove the animation from it. Try this:
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag
{
if([anim isKindOfClass:[CABasicAnimation class] ]) // check, because of the cast
{
CALayer *theLayer = 0;
if(anim==[_b1 animationForKey:#"opacity"])
theLayer = _b1; // I have two layers
else
if(anim==[_b2 animationForKey:#"opacity"])
theLayer = _b2;
if(theLayer)
{
CGFloat toValue = [((CABasicAnimation*)anim).toValue floatValue];
[theLayer setOpacity:toValue];
[theLayer removeAllAnimations];
}
}
}
The easiest solution is to use implicit animations. This will handle all of that trouble for you:
self.layer?.backgroundColor = NSColor.red.cgColor;
If you want to customize e.g. the duration, you can use NSAnimationContext:
NSAnimationContext.beginGrouping();
NSAnimationContext.current.duration = 0.5;
self.layer?.backgroundColor = NSColor.red.cgColor;
NSAnimationContext.endGrouping();
Note: This is only tested on macOS.
I initially did not see any animation when doing this. The problem is that the layer of a view-backed layer does not implicit animate. To solve this, make sure you add a layer yourself (before setting the view to layer-backed).
An example how to do this would be:
override func awakeFromNib() {
self.layer = CALayer();
//self.wantsLayer = true;
}
Using self.wantsLayer did not make any difference in my testing, but it could have some side effects that I do not know of.
It seems that removedOnCompletion flag set to false and fillMode set to kCAFillModeForwards doesn't work for me either.
After I apply new animation on a layer, an animating object resets to its initial state and then animates from that state.
What has to be done additionally is to set the model layer's desired property according to its presentation layer's property before setting new animation like so:
someLayer.path = ((CAShapeLayer *)[someLayer presentationLayer]).path;
[someLayer addAnimation:someAnimation forKey:#"someAnimation"];
Here is a sample from playground:
import PlaygroundSupport
import UIKit
let resultRotation = CGFloat.pi / 2
let view = UIView(frame: CGRect(x: 0.0, y: 0.0, width: 200.0, height: 300.0))
view.backgroundColor = .red
//--------------------------------------------------------------------------------
let rotate = CABasicAnimation(keyPath: "transform.rotation.z") // 1
rotate.fromValue = CGFloat.pi / 3 // 2
rotate.toValue = resultRotation // 3
rotate.duration = 5.0 // 4
rotate.beginTime = CACurrentMediaTime() + 1.0 // 5
// rotate.isRemovedOnCompletion = false // 6
rotate.fillMode = .backwards // 7
view.layer.add(rotate, forKey: nil) // 8
view.layer.setAffineTransform(CGAffineTransform(rotationAngle: resultRotation)) // 9
//--------------------------------------------------------------------------------
PlaygroundPage.current.liveView = view
Create an animation model
Set start position of the animation (could be skipped, it depends on your current layer layout)
Set end position of the animation
Set animation duration
Delay animation for a second
Do not set false to isRemovedOnCompletion - let Core Animation clean after the animation is finished
Here is the first part of the trick - you say to Core Animation to place your animation to the start position (you set in step #2) before the animation has even been started - extend it backwards in time
Copy prepared animation object, add it to the layer and start the animation after the delay (you set in step #5)
The second part is to set correct end position of the layer - after the animation is deleted your layer will be shown at the correct place