SKAction.moveByX not setting physicsBody.velocity

Question

I\'m writing a SpriteKit game using Swift, and am using the following code to move my sprite - however, it doesn\'t seem to be updating velocity.dx:

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Answer 1

Actions and physics are largely separate mechanisms in SpriteKit. Generally, if you're using physics to move a body, you shouldn't use move actions on it. If you want to move a body that's already using physics, use physics to move it -- apply a force or impulse, or set its velocity directly.

Conversely, when you use actions to move a body, or set its position directly, those changes don't go through the physics engine. If you want to find the speed of a node during a move action, you'll have to calculate it yourself by observing the change in its position between frames.