Animation is not working as expected - ios

Question

I implemented corePlot in xcode and I'm using the pie chart. I'm trying to create a 3d flip animation while the chart reloads. Here is the code:
CABasicAnimation *scaleAnimation = [CABasicAnimation animationWithKeyPath:#"transform.scale.x"];
scaleAnimation.fromValue = [NSNumber numberWithFloat:1.0];
scaleAnimation.toValue = [NSNumber numberWithFloat:0.5];
scaleAnimation.duration = 1.0f;
scaleAnimation.removedOnCompletion = NO;
[self.pieChart addAnimation:scaleAnimation forKey:#"scale"];
[self.pieChart reloadData];
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:#"transform.scale.x"];
animation.fromValue = [NSNumber numberWithFloat:0.5];
animation.toValue = [NSNumber numberWithFloat:1.0];
animation.duration = 1.0f;
[self.pieChart addAnimation:animation forKey:#"scale"];
I didn't get desirable effects. I think what's happening is, both animations are happening at once. (Though I'm not sure that is what's happening.)
Also, is it possible to add z-depth? If so, how?
Update
I tried the follwoing:
CABasicAnimation *currentAnition = (CABasicAnimation *)anim;
if (currentAnition == self.scaleAnimation {...}
And it didn't work.

Answer 1

CAAnimation is KVC compliant, so we can store whether you're starting or finishing for lookup in the delegate methods:
{
CABasicAnimation *scaleAnimation = [CABasicAnimation animationWithKeyPath:#"transform.scale.x"];
[scaleAnimation setValue:#(YES) forKey:#"scaleAnimation"];
// set the delegate
scaleAnimation.delegate = self;
scaleAnimation.fromValue = [NSNumber numberWithFloat:1.0];
scaleAnimation.toValue = [NSNumber numberWithFloat:0.5];
scaleAnimation.duration = 1.0f;
scaleAnimation.removedOnCompletion = NO;
[self.pieChart addAnimation:scaleAnimation forKey:#"scale"];
[self.pieChart reloadData];
}
- (void)runSecondAnimation
{
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:#"transform.scale.x"];
[animation setValue:#(YES) forKey:#"secondAnimation"];
animation.delegate = self;
animation.fromValue = [NSNumber numberWithFloat:0.5];
animation.toValue = [NSNumber numberWithFloat:1.0];
animation.duration = 1.0f;
[self.pieChart addAnimation:animation forKey:#"scale"];
}
/* Called when the animation either completes its active duration or
* is removed from the object it is attached to (i.e. the layer). 'flag'
* is true if the animation reached the end of its active duration
* without being removed. */
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
BOOL scaleAnimation = [[anim valueForKey:#"scaleAnimation"] boolValue];
if (scaleAnimation) {
[self runSecondAnimation];
}
BOOL secondAnimation = [[anim valueForKey:#"secondAnimation"] boolValue];
if (secondAnimation) {
[self runThirdAnimation];
}
}
And remember you have also:
/* Called when the animation begins its active duration. */
- (void)animationDidStart:(CAAnimation *)anim;