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POCore animation: why can I not composite two animations?
 

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  1. POCore animation: why can I not composite two animations?
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    <p>I am trying to animate a wheel</p> <p>When the finger rests for > 0.1s, the wheel ' pops out ' ie I animate Scale from 1.0 to 1.2. </p> <p>when the finger moves, the wheel rotates with it ( only if it is popped out ). </p> <p>But I'm getting a problem: as soon as it starts to rotate, the scale reduces back to 1.0. </p> <pre><code>- (void) spin: (Direction) direction { float thetaOld = thetaWheel; float k = (direction == AntiClockwise) ? -1 : 1; float t = 2 * M_PI * ( k / 12.0 ); thetaWheel += t; CABasicAnimation * anim = [CABasicAnimation animationWithKeyPath:@"transform"]; anim.fromValue = [NSNumber numberWithDouble: thetaOld]; anim.toValue = [NSNumber numberWithDouble: thetaWheel]; anim.valueFunction = [CAValueFunction functionWithName: kCAValueFunctionRotateZ]; anim.timingFunction = [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseInEaseOut]; anim.duration = 0.1f; anim.fillMode = kCAFillModeForwards; anim.removedOnCompletion = NO; [self.wheelLayer addAnimation: anim forKey:@"transform"]; } - (void) popOut { CABasicAnimation * anim = [CABasicAnimation animationWithKeyPath:@"transform.scale"]; anim.fromValue = [NSNumber numberWithDouble: 1.0]; anim.toValue = [NSNumber numberWithDouble: 1.2]; anim.timingFunction = [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseInEaseOut]; anim.duration = 0.25f; anim.fillMode = kCAFillModeForwards; anim.removedOnCompletion = NO; [self.wheelLayer addAnimation: anim forKey:@"transform.scale"]; } // doesnt get used yet - (void) popBack { CABasicAnimation * anim = [CABasicAnimation animationWithKeyPath:@"transform.scale"]; anim.fromValue = [NSNumber numberWithDouble: 1.2]; anim.toValue = [NSNumber numberWithDouble: 1.0]; anim.timingFunction = [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseInEaseOut]; anim.duration = 0.1f; anim.fillMode = kCAFillModeForwards; anim.removedOnCompletion = NO; [self.wheelLayer addAnimation: anim forKey:@"transform.scale"]; } </code></pre> <p>The last routine is not getting used at this time! So I can't see what is reducing the scale back to 1...</p> <p>it looks like somehow the second animation is overwriting the first one...</p> <p>how to do this properly?</p>
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