timespace

Is there a way to figure out what's the current affecting speed in a timespace?

Timespace problem: You make a big hierarchy of views, and give every layer a different speed value. Now all the Timespaces are messed up. At the bottom of the hierarchy you don't know what kind of time distortion you have. -10%? -90%? +50%? UIKit somehow has to calculate the speed in the hierarchy when animating. So I wonder if there's...

What do they mean by "the timespace of the animation's layer" and "in the local active time"?

They say: The timing protocol provides the means of starting an animation a certain number of seconds into its duration using two properties: beginTime and timeOffset. The beginTime specifies the number of seconds into the duration the animation should start and is scaled to the timespace of the animation's layer. The...