How Do You CAKeyframeAnimation Scale?

Question

I want to create an animation with several key frames. I want my Layer (a button in this case) to scale up to 1.5 then down to 0.5 then up to 1.2 then down to 0.8 then 1.0.

I also want to EaseIn and EaseOut of each keyframe.

As you can imagine, this will create a Springy/Bounce effect on the spot.

In other parts of my app I have been using CAKeyframeAnimation like this (see below code). This creates a similar springy animation but for x and y position.

Can I adapt the below code to affect scale instead of position?

Thank you in advance!

- (CAAnimation*)monInAnimation {
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path,NULL,113,320);
CGPathAddLineToPoint(path, NULL, 113.5, 283);
CGPathAddLineToPoint(path, NULL, 113.5, 179);
CGPathAddLineToPoint(path, NULL, 113.5, 207);  
CGPathAddLineToPoint(path, NULL, 113.5, 187);
CGPathAddLineToPoint(path, NULL, 113.5, 199);
CGPathAddLineToPoint(path, NULL, 113.5, 193);
CGPathAddLineToPoint(path, NULL, 113.5, 195);
CGPathAddLineToPoint(path, NULL, 113.5, 194);

CAKeyframeAnimation *
animation = [CAKeyframeAnimation 
             animationWithKeyPath:@"position"];

[animation setPath:path];
[animation setDuration:1.5];
[animation setCalculationMode:kCAAnimationLinear];
NSArray *arr = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0], 
 [NSNumber numberWithFloat:0.12], 
 [NSNumber numberWithFloat:0.24], 
 [NSNumber numberWithFloat:0.36], 
 [NSNumber numberWithFloat:0.48],
 [NSNumber numberWithFloat:0.60],
 [NSNumber numberWithFloat:0.72],
 [NSNumber numberWithFloat:0.84],
 [NSNumber numberWithFloat:1.0],nil];

 [animation setKeyTimes:arr];
 [animation setTimingFunctions:[NSArray arrayWithObjects:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut], nil]];
 //[animation setAutoreverses:YES];
CFRelease(path);
return animation;

}

- (void)monBtnIn {

[monButton.layer setPosition:CGPointMake(113.5,194)];
[monButton.layer addAnimation:[self monInAnimation] 
                    forKey:@"position"];

}

Answer 1

transform.scale, anyone?

let anim = CAKeyframeAnimation(keyPath: "transform.scale")
anim.values = [0, 1, 0, 1, 0, 1, 0]
anim.duration = 4.0

smallView.layer.addAnimation(anim, forKey: "what")

---

Totally unrelated, if you are gonna use floats in the values array, you must add them as NSNumbers, otherwise they'd just end up as 0s!

anim.values = [0.0, 1.2, 0.9, 1.0].map { NSNumber(double: $0) }