Resizing layers and its sublayers - CoreAnimation
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 numb开发者_JS百科erWithFloat: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.
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