I have a UIImageView that I spin forever (think a top-down view of a spool
in a tape cassette). However I would like to stop the rotation animation &
when it does NOT reset the UIImageView to it's original starting position.
I have this to start it:
CAKeyframeAnimation *rotationAnimation;
rotationAnimation = [CAKeyframeAnimation animationWithKeyPath:@
"transform.rotation.z"];
rotationAnimation.values = [NSArray arrayWithObjects:
[NSNumber numberWithFloat:0.0 * M_PI],
[NSNumber numberWithFloat:0.75 * M_PI],
[NSNumber numberWithFloat:1.5 * M_PI],
[NSNumber numberWithFloat:2.0 * M_PI], nil];
rotationAnimation.calculationMode = kCAAnimationPaced;
rotationAnimation.removedOnCompletion = NO;
rotationAnimation.fillMode = kCAFillModeForwards;
rotationAnimation.timingFunction = [CAMediaTimingFunction
functionWithName:kCAMediaTimingFunctionLinear];
rotationAnimation.duration = 5.0;
rotationAnimation.repeatCount = INFINITY;
CALayer *layer = [leftSpool layer];
[layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
And this to stop it:
//This is resetting the rotation to 0 - a visible jump
[leftSpool.layer removeAnimationForKey:@"rotationAnimation"];
I am looking for a way to start it, stop at current angle, and then restart
at current angle...
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