I have a CALayer A with one sublayer B
I want A to be resized (to be shrank) so I add the animations to my layer A
but when I commit the animation sublayer B is not shrank. Its size remains(but its position changes as its superlayer bounds changes)
How can I make my B layer to be resized along with A animation?
This is what I wrote:
CABasicAnimation *fadeInAnimation;
fadeInAnimation=[CABasicAnimation animationWithKeyPath:#"opacity"];
fadeInAnimation.repeatCount = 1;
fadeInAnimation.autoreverses = NO;
fadeInAnimation.fromValue = [NSNumber numberWithFloat:1.0];
fadeInAnimation.toValue = [NSNumber numberWithFloat:0.0];
CABasicAnimation *shrinkAnimation;
shrinkAnimation = [CABasicAnimation animationWithKeyPath:#"bounds.size"];
shrinkAnimation.repeatCount = 1;
shrinkAnimation.autoreverses = NO;
shrinkAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
shrinkAnimation.toValue = [NSValue valueWithCGSize:CGSizeMake(0, 0)];
aniGroupOFF = [[CAAnimationGroup animation] retain];
aniGroupOFF.delegate = self;
aniGroupOFF.duration = ANI_DURATION;
aniGroupOFF.animations = [NSArray arrayWithObjects:shrinkAnimation, fadeInAnimation, nil];
And the commit:
[self addAnimation:aniGroupOFF forKey:#"shrinkAndFade"];
self.opacity = 0.0;
Answer:
CABasicAnimation *shrinkAnimation;
shrinkAnimation = [CABasicAnimation animationWithKeyPath:#"transform"]; //use transform instead of bounds.size
shrinkAnimation.repeatCount = 1;
shrinkAnimation.autoreverses = NO;
shrinkAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
shrinkAnimation.toValue = [NSValue valueWithCATransform3D:CATransform3DScale(self.transform, 0.1, 0.1, 1.0)];
aniGroupOFF = [[CAAnimationGroup animation] retain];
aniGroupOFF.delegate = self;
aniGroupOFF.duration = ANI_DURATION;
aniGroupOFF.animations = [NSArray arrayWithObjects:shrinkAnimation, nil];
The easiest way to achieve this is to animate the keyPath "transform.scale" instead of "bounds.size".
If you stick with "bounds.size" you will need to implement layoutSublayers on layer A or layoutSublayersOfLayer:(CALayer*)aLayer on A's delegate and manually adjust B's size in that implementation.
Related
I have a UIView for which I am using the following code for pop-in animation
float duration=1.3f;
CAKeyframeAnimation *scale = [CAKeyframeAnimation animationWithKeyPath:#"transform.scale"];
scale.duration = duration;
scale.values = [NSArray arrayWithObjects:[NSNumber numberWithFloat:.5f],
[NSNumber numberWithFloat:1.1f],
[NSNumber numberWithFloat:0.95f],
[NSNumber numberWithFloat:1.f],
nil];
CABasicAnimation *fadeIn = [CABasicAnimation animationWithKeyPath:#"opacity"];
fadeIn.duration = duration * .2f;
fadeIn.fromValue = [NSNumber numberWithFloat:0.f];
fadeIn.toValue = [NSNumber numberWithFloat:1.f];
fadeIn.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
fadeIn.fillMode = kCAFillModeForwards;
CAAnimationGroup *animationgroup = [CAAnimationGroup animation];
animationgroup.delegate=self;
animationgroup.animations = [NSArray arrayWithObjects:scale, fadeIn, nil];
animationgroup.duration = duration;
animationgroup.fillMode = kCAFillModeForwards;
animationgroup.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[animationgroup setValue:#"popIn" forKey:#"name"];
animationgroup.fillMode=kCAFillModeForwards;
[self.view.layer addAnimation:animationgroup forKey:#"popIn"];
That works fone. It pops In the view in perfect way. But the code of pop-out animation is gives a jerk at end of animation that looks quite wierd.
Here is my popout code
float duration=0.15f;
CAKeyframeAnimation *scale = [CAKeyframeAnimation animationWithKeyPath:#"transform.scale"];
scale.duration = duration;
scale.removedOnCompletion = NO;
scale.values = [NSArray arrayWithObjects:[NSNumber numberWithFloat:1.f],
[NSNumber numberWithFloat:1.1f],
[NSNumber numberWithFloat:.15f],
nil];
CABasicAnimation *fadeOut = [CABasicAnimation animationWithKeyPath:#"opacity"];
fadeOut.duration = duration * .4f;
fadeOut.fromValue = [NSNumber numberWithFloat:1.f];
fadeOut.toValue = [NSNumber numberWithFloat:0.f];
fadeOut.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
fadeOut.beginTime = duration * .6f;
fadeOut.fillMode = kCAFillModeBoth;
CAAnimationGroup *animationgroup = [CAAnimationGroup animation];
animationgroup.animations = [NSArray arrayWithObjects:scale, fadeOut, nil];
animationgroup.duration = duration;
animationgroup.fillMode = kCAFillModeForwards;
animationgroup.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
[animationgroup setValue:#"popOut" forKey:#"name"];
animationgroup.fillMode=kCAFillModeForwards;
[self.view.layer addAnimation:animationgroup forKey:#"popOut"];
The scale sequence 1.0, 1.1, 0.15 should result in a jerk.
If you are not satisfied with the visual results, try fiddling with the values above and the timing function (you are using "easeIn" instead of "easeInOut").
During Animation only the presentation layer gets changes while the modal layer of the view stays to its original state.
In your case you are not preserving the state of presentation layer when animation is finished and Modal layer appears which is in it original form. which seems like the Jerk effect.
Use the following line after "animationgroup.fillMode=kCAFillModeForwards;" to preserve the presentation layer state and the jerk will go away.
animationgroup.removedOnCompletion=NO;
I am creating a bookmarking feature for my app, I'd like to show the user what happens in a way similar to itunes store, when you buy something it jumps to tabBar. I once watched some WWDC video that explained this, but can't remember how to do it. Any idea where I should start looking for?
You can take a snapshot of the view you want to animate, then create an image layer, then use Core Animation to animate that to the tab bar. Here's the code I use to do that:
- (void)animateSnapshotOfView:(UIView *)view toTab:(UINavigationController *)navController
{
NSUInteger targetTabIndex = [self.tabBarController.viewControllers indexOfObject:navController];
NSUInteger tabCount = [self.tabBarController.tabBar.items count];
// AFAIK there's no API (as of iOS 4) to get the frame of a tab bar item, so guesstimate using the index and the tab bar frame.
CGRect tabBarFrame = self.tabBarController.tabBar.frame;
CGPoint targetPoint = CGPointMake((targetTabIndex + 0.5) * tabBarFrame.size.width / tabCount, CGRectGetMidY(tabBarFrame));
targetPoint = [self.window convertPoint:targetPoint fromView:self.tabBarController.tabBar.superview];
UIGraphicsBeginImageContext(view.frame.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGRect frame = [self.window convertRect:view.frame fromView:view.superview];
CALayer *imageLayer = [CALayer layer];
imageLayer.contents = (id)image.CGImage;
imageLayer.opaque = NO;
imageLayer.opacity = 0;
imageLayer.frame = frame;
[self.window.layer insertSublayer:imageLayer above:self.tabBarController.view.layer];
CGMutablePathRef path = CGPathCreateMutable();
CGPoint startPoint = imageLayer.position;
CGPathMoveToPoint(path, NULL, startPoint.x, startPoint.y);
CGPathAddCurveToPoint(path,NULL,
startPoint.x + 100, startPoint.y,
targetPoint.x, targetPoint.y - 100,
targetPoint.x, targetPoint.y);
CAKeyframeAnimation *positionAnimation = [CAKeyframeAnimation animationWithKeyPath:#"position"];
positionAnimation.path = path;
CGPathRelease(path);
CABasicAnimation *sizeAnimation = [CABasicAnimation animationWithKeyPath:#"bounds.size"];
sizeAnimation.fromValue = [NSValue valueWithCGSize:imageLayer.frame.size];
sizeAnimation.toValue = [NSValue valueWithCGSize:CGSizeMake(50, 50)];
CABasicAnimation *opacityAnimation = [CABasicAnimation animationWithKeyPath:#"opacity"];
opacityAnimation.fromValue = [NSNumber numberWithFloat:0.75];
opacityAnimation.toValue = [NSNumber numberWithFloat:0];
CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
animationGroup.animations = [NSArray arrayWithObjects:positionAnimation, sizeAnimation, opacityAnimation, nil];
animationGroup.duration = 1.0;
animationGroup.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
animationGroup.delegate = self;
[animationGroup setValue:imageLayer forKey:#"animatedImageLayer"];
[imageLayer addAnimation:animationGroup forKey:#"animateToTab"];
}
I am using CABasicAnimation for animating an image from top to bottom of the screen. I need to
get frame of the image while it is animating from top to bottom......
Code:
-(id)init
{
if(self = [super init])
{
self.title =#"Apple Catch";
mView = [[UIView alloc]initWithFrame:CGRectMake(0,0,320,440)];
// start a timet that will fire 20 times per second
[NSTimer scheduledTimerWithTimeInterval:(0.9) target:self selector:#selector(onTimer)
userInfo:nil repeats:YES];
self.view=mView;
}
return self;
}
- (void)onTimer
{
CGImageRef imageRef = [[UIImage imageNamed:#"apple.png"] CGImage];
int startX = round(random() % 460);
double speed = 1 / round(random() %100) + 1.0;
CALayer *layer = [CALayer layer];
layer.name = #"layer";
layer.contents = imageRef;
layer.frame = CGRectMake(startX, self.view.frame.origin.y, CGImageGetWidth(imageRef),
CGImageGetHeight(imageRef));
[mView.layer addSublayer:layer];
CGPoint start = CGPointMake(startX, 0);
CGPoint end = CGPointMake(startX, self.view.frame.size.height+10);
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:#"position"];
animation.delegate = self;
animation.fromValue = [NSValue valueWithCGPoint:start];
animation.toValue = [NSValue valueWithCGPoint:end];
animation.duration = 10*speed;
//animation.repeatCount = repeatCount;
animation.autoreverses = NO;
animation.removedOnCompletion = YES;
animation.fillMode = kCAFillModeForwards;
[layer addAnimation:animation forKey:#"position"];
BOOL intersects = CGRectIntersectsRect(layer.frame , dragger.frame);
printf("\n ==== intersects value :%d",intersects);
}
I need the frame of the image that is animating at each point of it's path on the view.
Can u please suggest the code for this.
Thank U
Use the presentationLayer property of the CALayer to which the animation is applied.
Hi friend
you can try if (CGRectIntersectsRect(layer.frame,dragger.frame) ) {
nslog(#"hiiii");
}
So, I have read in the docs, that use of blocks like
beginAnimation
commitAnimation
is discouraged from os4.0.
So I have tried to get my code to work by using CABasicAnimation. I want to achieve, that an image's frame is resized from its thumbnail size, somewhere within my view, to a full width position e.g. (0, 120, 320, 240) - on my iPhone.
What I have so far:
[CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat:1.0] forKey:kCATransactionAnimationDuration];
CABasicAnimation *scalingAnimation;
scalingAnimation = [CABasicAnimation animationWithKeyPath:#"transform"];
scalingAnimation.duration=1.0/2;
scalingAnimation.autoreverses=YES;
scalingAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
scalingAnimation.fromValue=[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0, 1.0, 1.0)];
scalingAnimation.toValue=[NSValue valueWithCATransform3D:CATransform3DMakeScale(4, 4, 1)];
[b.layer addAnimation:scalingAnimation forKey:#"scaling"];
[CATransaction commit];
My nextstep would be to first try to move the image to a centered position then scale it to the correct size. However, I doubt I'm doin it the right way. Can anyone comment on my code/approach.... is there a better way?
Am pretty sure you have solved this by now, but in any case.
You shouldn't need the [CATransaction begin]; and [CATransaction commit];
The simplest way that I have found to do this kind of thing is to use CAAnimationGroup and and add the animations one by one.
An example would be
CABasicAnimation *scaleX = [CABasicAnimation animationWithKeyPath:#"transform.scale.x"];
//this is not used, as the group provides the duration
scaleX.duration = duration;
scaleX.autoreverses = NO;
scaleX.toValue = [NSNumber numberWithFloat:1.0];
scaleX.fromValue = [NSNumber numberWithFloat:scaleFrom];
scaleX.fillMode = kCAFillModeForwards;
scaleX.removedOnCompletion = NO;
CABasicAnimation *scaleY = [CABasicAnimation animationWithKeyPath:#"transform.scale.y"];
//this is not used, as the group provides the duration
scaleY.duration = duration;
scaleY.autoreverses = NO;
scaleY.toValue = [NSNumber numberWithFloat:1.0];
scaleY.fromValue = [NSNumber numberWithFloat:scaleFrom];
scaleY.fillMode = kCAFillModeForwards;
scaleY.removedOnCompletion = NO;
//add in the translation animations
NSMutableArray* animationsArray = [NSMutableArray arrayWithObjects:scaleX,
scaleY,
//and any other animations you want in the group
nil];
CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
animationGroup.duration = 1.0/2;
animationGroup.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseIn];
animationGroup.animations = animationsArray;
animationGroup.delegate = self;
animationGroup.removedOnCompletion = YES;
animationGroup.fillMode = kCAFillModeForwards;
[animationGroup setValue:#"imageTransform" forKey:#"AnimationName"];
[b.layer addAnimation:animationGroup forKey:#"imageTransform"];
There are a few gotchas though. Animations are purely visual, so before running the animations, set your eventual view frame.
You will notice that the scales end at 1, this is to ensure that you dont end up with a scaled image layer. Instead we start it scaled and bring it back to normal.
Translations should be done in the same way.
Hope this helps
//in Event Method Copy Below code to place the image to the center
CABasicAnimation* positionAnimation;
positionAnimation = [CABasicAnimation animationWithKeyPath:#"position"];
positionAnimation.fromValue = [NSValue valueWithCGPoint:imageView.layer.position];
positionAnimation.toValue = [NSValue valueWithCGPoint:centerPointofView];
positionAnimation.duration = 2.0;
positionAnimation.fillMode = kCAFillModeForwards;
positionAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
positionAnimation.removedOnCompletion = NO;
positionAnimation.delegate = self;
[imageView.layer addAnimation:positionAnimation forKey:#"positionAnimation"];
// For Scale After image is in center copy below code
- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag{
CAAnimation *animation = [imageView.layer animationForKey:#"positionAnimation"];
if (animation == theAnimation)
{
CABasicAnimation* scaleAnimation;
scaleAnimation = [CABasicAnimation animationWithKeyPath:#"transform.scale"];
scaleAnimation.fromValue = [NSNumber numberWithFloat:1];
scaleAnimation.toValue = [NSNumber numberWithFloat:4.0];
scaleAnimation.duration = 2.2;
scaleAnimation.fillMode = kCAFillModeForwards;
scaleAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
scaleAnimation.removedOnCompletion = NO;
scaleAnimation.delegate = self;
[imageView.layer addAnimation:scaleAnimation forKey:#"scaleAnimation"];
}
else
{
//if you want changes to image should remain forever
//place your code for scale & transform here
....................
//now simple remove animation from layer
[imageView.layer removeAllAnimations];
}
}
Cant you use
[UIView animateWithDuration:2.0
animations:^{
//animations
}
completion:^(BOOL finished){
// completion methods
}];
I'm using following code to animate a view. It basically rotates the view by 225 degrees angle.
[viewToOpen.layer removeAllAnimations];
viewToOpen.hidden = NO;
viewToOpen.userInteractionEnabled = NO;
if (viewToOpen.layer.anchorPoint.x != 0.0f) {
viewToOpen.layer.anchorPoint = CGPointMake(0.0f, 0.5f);
viewToOpen.center = CGPointMake(viewToOpen.center.x - viewToOpen.bounds.size.width/2.0f, viewToOpen.center.y);
}
CABasicAnimation *transformAnimation = [CABasicAnimation animationWithKeyPath:#"transform"];
transformAnimation.removedOnCompletion = NO;
transformAnimation.duration = duration;
transformAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
CATransform3D endTransform = CATransform3DMakeAffineTransform(CGAffineTransformMakeRotation(225));
transformAnimation.toValue = [NSValue valueWithCATransform3D:endTransform];
CAAnimationGroup *theGroup = [CAAnimationGroup animation];
theGroup.delegate = self;
theGroup.duration = duration;
[theGroup setValue:[NSNumber numberWithInt:viewToOpen.tag] forKey:#"viewToOpenTag"];
theGroup.animations = [NSArray arrayWithObjects:transformAnimation, nil];
theGroup.removedOnCompletion = NO;
[viewToOpen.layer addAnimation:theGroup forKey:#"flipViewOpen"];
But the problem is that, at the end of animation, the view is coming back to original position. I would like to keep the view in same position even after animation completes. How can I do it?
I believe you're experiencing the same issue as can be seen in this question and this one. You either need to set fillMode to kCAFillModeForwards or set the transform of the layer when the animation has been completed.