I'll address the issue with the animation ignoring your duration
first. Try placing your addAnimation call before the
setValue:forKeyPath. Let me know if that works. Also, you will *need*
to specify a fromValue in your animation. If you want the current
value (in the case where an animation is already running), get it from
the presentationLayer, e.g. [[layer presentationLayer]
valueForKeyPath@"transform.scale"]; This is the "in-flight" value.
Now let me try to clarify what I mean with the derived layer. Say
you've declared a layer called RolloverLayer that inherits from
CALayer. Calling animationForKey will return the default animation for
the keyPath you specify in the key. If you override it, *you*
determine what animation to use. It would look something like this:
- (CAAnimation *)animationForKey:(NSString *)key
{
if ([key isEqualToString:@"transform.scale"] )
{
CABasicAnimation *growAnimation = [[CABasicAnimation
animationWithKeyPath:@"transform.scale"] retain];
growAnimation.duration = 5; // very slow
// Need from value here
growAnimation.fromValue = [[self presentationLayer]
valueForKeyPath:@"transform.scale"];
growAnimation.toValue = [[[CardManager instance] config]
objectForKey:@"cardHoverScale"];
growAnimation.timingFunction = [CAMediaTimingFunction
functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
return growAnimation;
}
else if ([key isEqualToString:@"position"])
{
CABasicAnimation *postiionAnimation = [CABasicAnimation
animationWithKeyPath:@"position"];
positionAnimation.fromValue = [[self presentationLayer]
position];
positionAnimation.toValue = // etc...
}
// .........
else
{
return [super animationForKey:key];
}
}
Now, when you have one of your derived layers in use, you can do this:
// Assuming it's tied to a button or something
- (IBAction)animate:(id)sender
{
// rolloverLayer is a RolloverLayer ivar
[rolloverLayer setValue:[[[CardManager instance] config]
objectForKey:@"cardHoverScale"] forKeyPath:@"transform.scale"];
[rolloverLayer setPosition:CGPointMake(x,y)];
// etc.
}
Your overridden animationForKey will get called to get the proper
animation.
HTH,
-Matt
p.s. if you want to know when an animation has completed, set the
layer's delegate to your app delegate and then implement -
(void)animationDidStop:(CAAnimation *)theAnimation finished:
(BOOL)flag . The flag field tells you whether or not it stopped by
interruption or by run completion. YES means it completed its run, NO
means it was interrupted.
On Mar 19, 2009, at 11:09 AM, Memo Akten wrote:
Hi Matt, yea it is a bit complex, but it seems to me that what I am
trying to do is actually quite simple:
- when I rollover a layer, it animates position, scale, rotation and
alpha.
- when I rollout, it animates back.
- if I rollover, then midanimation, rollout again, it should animate
back to original position *from where it was at the moment I rolled
out*, NOT snapping to the hover position (which is why I can't use
FromValues).
I also would like the animation to be EaseInEaseOut and know when
the animation is complete - which is why I'm using CAAnimation, so I
can use delegate - instead of using implicit animation.
Going back to what you were saying, I'm afraid I don't full
understand. So I extend CALayer? How would I use animationForKey?
Does that not only return the animation for a given arbitrary key?
Also I tried the code below, and unfortunately the animation
happened very quickly, not 5 seconds at all...
growAnimation = [[CABasicAnimation
animationWithKeyPath:@"transform.scale"] retain];
growAnimation.duration = 5; // very slow
growAnimation.toValue = [[[CardManager instance] config]
objectForKey:@"cardHoverScale"];
growAnimation.timingFunction = [CAMediaTimingFunction
functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[rootLayer setValue:[[[CardManager instance] config]
objectForKey:@"cardHoverScale"] forKeyPath:@"transform.scale"];
[rootLayer addAnimation:growAnimation forKey:@"transform.scale"];
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
