if u r doing AVAudioPlayer, and u grep currentTime, if u wanna has a more accurate time, it cannot do it … since it is quite discrete (for compress song like mp3) … so

CACurrentMediaTime() may help u

beginTime = CACurrentMediaTime()

… some animation …

animateTime = CACurrentMediaTime() – beginTime

so i have some value can calculate the view if the animation wanna pause in the middle

(too complicated animation recommend use CAKeyFrameAnimation)