Dear list,
I have a CALayer called textLayer which displays some message, for example
"Hello". I perform two consecutive animations on it. At the end of the first
animation, the text is no more visible. The message then gets updated (to "Good
bye", let's say) and the second animation brings the layer back to its initial
position.
My problem is that at the end of the first animation, the "Hello" message shows
up in its initial position for a fraction of a second.
I've tried to set the fillMode of the first animation to kCAFillModeForwards
with no effect.
Here is the code for the setup of the animations and the animationDidStop:
delegate call for the first one :
textRotationFirstHalf = [[CABasicAnimation animation] retain];
textRotationFirstHalf.fromValue = [NSNumber numberWithFloat: 0.0];
textRotationFirstHalf.toValue = [NSNumber numberWithFloat: M_PI / 2];
textRotationFirstHalf.keyPath = [NSString stringWithString:
@"transform.rotation.x"];
textRotationFirstHalf.timingFunction = [CAMediaTimingFunction functionWithName:
kCAMediaTimingFunctionEaseIn];
textRotationFirstHalf.delegate = self;
[textRotationFirstHalf setValue:@"Rotation Continues" forKey:@"What Next"];
textRotationFirstHalf.duration = 0.25;
textRotationSecondHalf = [[CABasicAnimation animation] retain];
textRotationSecondHalf.fromValue = [NSNumber numberWithFloat: M_PI / 2];
textRotationSecondHalf.toValue = [NSNumber numberWithFloat: 0];
textRotationSecondHalf.keyPath = [NSString stringWithString:
@"transform.rotation.x"];
textRotationSecondHalf.timingFunction = [CAMediaTimingFunction
functionWithName: kCAMediaTimingFunctionEaseOut];
textRotationSecondHalf.duration = 0.25;
-(void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag
{
NSString *value = [theAnimation valueForKey: @"What Next"];
if([value isEqual:@"Rotation Continues"])
{
[self updateText];
[textLayer addAnimation: textRotationSecondHalf forKey: @"End Rotation"];
}
}
The updateText method just calls [textLayer setNeedsDisplay] which results in
the display of the "Good bye" message, because a state variable has changed
meanwhile.
What can I do to recover the smoothness of this animation sequence and get rid
of the unwanted frame ?
Thank you for any ideas,
Rodolfo Niborski
http://itunes.com/apps/yiddishforkids1-alefbeys_______________________________________________
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