Graphics Reference
In-Depth Information
{
//create the keyframe animation
CAKeyframeAnimation *animation = [ CAKeyframeAnimation animation ];
animation. keyPath = @"position" ;
animation. timeOffset = self .timeOffsetSlider. value ;
animation. speed = self .speedSlider. value ;
animation. duration = 1.0 ;
animation. path = self .bezierPath. CGPath ;
animation. rotationMode = kCAAnimationRotateAuto ;
animation. removedOnCompletion = NO ;
[ self .shipLayer addAnimation :animation forKey : @"slide" ];
}
@end
Figure 9.3 A simple app to test the effect of time offset and speed
fillMode
An animation that has a beginTime greater than zero can be in a state where it is attached to
a layer but has not yet started animating. Similarly, an animation whose
removeOnCompletion property is set to NO will remain attached to a layer after it has
finished. This raises the question of what the value of the animated properties will be before
the animation has started and after it has ended.
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