Core Animation, unexpected animated position and hitTest values
When I use :
CALayer *hitLayer =
[[self.view.window.layer presentationLayer] hitTest:pointOfTouch]; The layer I'm testing on is the CALayer of an UIImageView in iOS 4.3. I also have an IBOutlet to that UIImage view. So I did the same test like this:
CALayer *l = [self.topLeft.layer presentationLayer];
NSLog(@"presentation layer frame for eloise is : %@", [self cgRectDescription:l.frame]);
NSLog(@"and xPosition = %.2f, yPosition = %.2f & zPosition = %.2f", l.position.x, l.position.y, l.zPosition);I'm testing this in (void)touchesBegan:withEvent: while the image is moving.
Here is the animation I'm using
[UIImageView animateWithDuration:aDuration
delay:0
options:UIViewAnimationOptionCurveEaseIn | UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionBeginFromCurrentState
animations:^(void) {
aIv.center = imageStartingPoint;
aIv.layer.zPosition = 0;
imageStartingPoint = CGPointZero;
centerImage = nil;
CABasicAnimation *ba = [CABasicAnimation animationWithKeyPath:@"shadowOffset"];
ba.fromValue = [NSValue valueWithCGSize:aIv.layer.shadowOffset];
ba.toValue = [NSValue valueWithCGSize:CGSizeMake(0, 0)];
aIv.layer.shadowOffset = CGSizeMake(0, 0);
ba.duration = aDuration;
ba.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[aIv.layer addAnimation:ba forKey:@"shadowOffset"];
ba = [CABasicAnimation animationWithKeyPath:@"shadowRadius"];
ba.fromValue = [NSNumber numberWithFloat:aIv.layer.shadowRadius];
ba.toValue = [NSNumber numberWithFloat:0];
aIv.layer.shadowRadius = 0;
ba.duration = aDuration;
ba.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[aIv.layer addAnimation:ba forKey:@"shadowRadius"];
}
completion:NULL]; </pre> </code>
It's probably a little simple thing, but I'm out of idea, thanks,
I've got a solution.
I just explored an idea, I realize that I didn't check if the value of the CABasicAnimation(s) where behaving correctly in the presentation layer... and... they were.
I had to do those 2 in explicit animation, because implicit was not supported.
So I made some more basic animation for the center of the image and the zPosition. And now I have the information in the presentation layer.
So for now I can conclude that if you need to get a valid presentation layer you absolutely need to do EXPLICIT animation with a CAAnimation.
I'm kind of sad, because I was liking the UIView animateWithDuration:...
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