How can I create an CABasicAnimation for multiple

Question

I have this code to animate a CALayer element.

CABasicAnimation *makeBiggerAnim=[CABasicAnimation animationWithKeyPath:@"radius"];
makeBiggerAnim.duration=0.2;
makeBiggerAnim.fromValue=[NSNumber numberWithDouble:20.0];
makeBiggerAnim.toValue=[NSNumber numberWithDouble:40.0];
makeBiggerAnim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

My question is, now everything works fine, I would like another attribute of the same element at the same time. I've seen you can do additive animations and stuff.

My question is:

• Is the additive attribute the best / only way to do that? (animating at once multiple properties of the same object at once )

Thanks!

Answer 1

let groupAnimation = CAAnimationGroup()
groupAnimation.beginTime = CACurrentMediaTime() + 0.5
groupAnimation.duration = 0.5


let scaleDown = CABasicAnimation(keyPath: "transform.scale")
scaleDown.fromValue = 3.5
scaleDown.toValue = 1.0
let rotate = CABasicAnimation(keyPath: "transform.rotation")
rotate.fromValue = .pi/10.0
rotate.toValue = 0.0
let fade = CABasicAnimation(keyPath: "opacity")
fade.fromValue = 0.0
fade.toValue = 1.0

groupAnimation.animations = [scaleDown,rotate,fade]
loginButton.layer.add(groupAnimation, forKey: nil)

This is for the newest update on swift (swift 3). Your code should include a object at the end, i.e. UIButton, UILabel, something that you can animate. In my code it was the loginButton (which was the title or name).

Answer 2

You can create an CAAnimationGroup and customize the duration and timing function on it. Then you create all your CABasicAnimations, set their to value and add them to the animation group. Finally, you add the animation group to the layer that you are animating.

Here an example:

CABasicAnimation *makeBiggerAnim=[CABasicAnimation animationWithKeyPath:@"cornerRadius"];
makeBiggerAnim.fromValue=[NSNumber numberWithDouble:20.0];
makeBiggerAnim.toValue=[NSNumber numberWithDouble:40.0];

CABasicAnimation *fadeAnim=[CABasicAnimation animationWithKeyPath:@"opacity"];
fadeAnim.fromValue=[NSNumber numberWithDouble:1.0];
fadeAnim.toValue=[NSNumber numberWithDouble:0.0];

CABasicAnimation *rotateAnim=[CABasicAnimation animationWithKeyPath:@"transform.rotation.y"];
rotateAnim.fromValue=[NSNumber numberWithDouble:0.0];
rotateAnim.toValue=[NSNumber numberWithDouble:M_PI_4];

// Customizing the group with duration etc, will apply to all the
// animations in the group
CAAnimationGroup *group = [CAAnimationGroup animation];
group.duration = 0.2;
group.repeatCount = 3;
group.autoreverses = YES;
group.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
group.animations = @[makeBiggerAnim, fadeAnim, rotateAnim];

[myLayer addAnimation:group forKey:@"allMyAnimations"];

Answer 3

In Swift-3 we can use CAAnimationGroup as below :-

        let position = CAKeyframeAnimation(keyPath: "position")
        position.values = [ NSValue.init(cgPoint: .zero) , NSValue.init(cgPoint: CGPoint(x: 0, y: -20))  ,  NSValue.init(cgPoint: .zero) ]
        position.timingFunctions = [ CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut),  CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut)  ]
        position.isAdditive = true
        position.duration = 1.2

        let rotation = CAKeyframeAnimation(keyPath: "transform.rotation")
        rotation.values = [ 0, 0.14, 0 ]
        rotation.duration = 1.2
        rotation.timingFunctions = [ CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut),  CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut)  ]

        let fadeAndScale = CAAnimationGroup()
        fadeAndScale.animations = [ position, rotation]
        fadeAndScale.duration = 1