Purposely slowing down FPS Spritekit

Question

Is it possible to purposely slow down the SpriteKit scene's FPS? I was thinking if this is possible to make debugging of my game easier.

Answer 1

You can do something like this as well (as an addition to crashoverride777's answer) by slowing down nodes or physics:

To make nodes going into slow-mo (you can do this per node):

self.speed = 0.2 //where self is a scene

or to do the same with physics:

self.physicsWorld.speed = 0.2 //where self is a scene

Answer 2

You can change the FPS value of your SKView when you load the first scene from your GameViewController.

Something like:

if #available(iOS 10.0, *) { 
     skView.preferredFramesPerSecond = 30 // 30 FPS 
} else {
     skView.frameInterval = 2 // Deprecated (1 default = 60FPS so 2 would = 30 FPS)
     skView.preferredFrameRate = ... // Deprecated
}

As Whirlwind so kindly pointed out in his answer:

"Also, this will not slowdown anything, you just skip frames you are seeing, eg. if you have a node that moves from point A to point B in 5 seconds, and you change preferredFrameRate to 30fps, the node will move from A to B still in 5 seconds, rather than 10. The only change you will see, is that some frames are skipped."

SKView API reference here