Chaining animations and memory management
- by bryan1967
Hey Everyone,
Got a question. I have a subclassed UIView that is acting as my background where I am scrolling the ground. The code is working really nice and according to the Instrumentation, I am not leaking nor is my created and still living Object allocation growing.
I have discovered else where in my application that adding an animation to a UIImageView that is owned by my subclassed UIView seems to bump up my retain count and removing all animations when I am done drops it back down.
My question is this, when you add an animation to a layer with a key, I am assuming that if there is already a used animation in that entry position in the backing dictionary that it is released and goes into the autorelease pool?
For example:
- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag
{
NSString *keyValue = [theAnimation valueForKey:@"name"];
if ( [keyValue isEqual:@"step1"] && flag ) {
groundImageView2.layer.position = endPos;
CABasicAnimation *position = [CABasicAnimation animationWithKeyPath:@"position"];
position.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
position.toValue = [NSValue valueWithCGPoint:midEndPos];
position.duration = (kGroundSpeed/3.8);
position.fillMode = kCAFillModeForwards;
[position setDelegate:self];
[position setRemovedOnCompletion:NO];
[position setValue:@"step2-1" forKey:@"name"];
[groundImageView2.layer addAnimation:position forKey:@"positionAnimation"];
groundImageView1.layer.position = startPos;
position = [CABasicAnimation animationWithKeyPath:@"position"];
position.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
position.toValue = [NSValue valueWithCGPoint:midStartPos];
position.duration = (kGroundSpeed/3.8);
position.fillMode = kCAFillModeForwards;
[position setDelegate:self];
[position setRemovedOnCompletion:NO];
[position setValue:@"step2-2" forKey:@"name"];
[groundImageView1.layer addAnimation:position forKey:@"positionAnimation"];
}
else if ( [keyValue isEqual:@"step2-2"] && flag ) {
groundImageView1.layer.position = midStartPos;
CABasicAnimation *position = [CABasicAnimation animationWithKeyPath:@"position"];
position.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
position.toValue = [NSValue valueWithCGPoint:endPos];
position.duration = 12;
position.fillMode = kCAFillModeForwards;
[position setDelegate:self];
[position setRemovedOnCompletion:NO];
[position setValue:@"step1" forKey:@"name"];
[groundImageView1.layer addAnimation:position forKey:@"positionAnimation"];
}
}
This chains animations infinitely, and as I said one it is running the created and living object allocation doesn't change. I am assuming everytime I add an animation the one that exists in that key position is released.
Just wondering I am correct. Also, I am relatively new to Core Animation. I tried to play around with re-using the animations but got a little impatient. Is it possible to reuse animations?
Thanks!
Bryan
