How to implement SKActionTimingFunction?

问题

How do you implement SKActionTimingFunction in objective-c?. I've looked everywhere and I just found an example in swift.

Thanks!

回答1:

heres an example

moveAction.timingFunction = ^float(float t){
    return sin(t * M_PI/2);
};

man i hate blocks in objective-c

回答2:

In Swift 4.2:

moveAction.timingFunction = { time -> Float in
    return sin(time * .pi/2)
}

来源：https://stackoverflow.com/questions/28520521/how-to-implement-skactiontimingfunction