Cocoa Animation Timing

You change the default animation timing by setting the current animation context’s duration like this:

 

[NSAnimationContext beginGrouping];
[[NSAnimationContext currentContext] setDuration:2.0f];
// your code here
[NSAnimationContext endGrouping];

 

注意

The NSAnimationContext duration affects only the animations that do not
have their duration explicitly set. So if we were to use a context to slow
animations, it would not work for the animations that have had their
durations set explicitly as outlined here.