对于iPad和iPhone来说，使用CADisplayLink必须是60fps吗？

Question

In other words, can we choose to invoke the handler at 20 times per second, or at 45 times per second, or must it be 60 times per second?

I guess one way to simulate it will be to use the timestamp given to the handler to determine if it is "time for action yet" -- if not, simply return without doing anything?

Answer 1

You can use the frameInterval property to invoke the handler every 60/n frames, where n is a positive integer.

You can't invoke the handler 45 times per second, but the following values are possible: 60 , 30 , 20 , 15 , 12 , ...