I have the following code to move an SKSpriteNode.
SKSpriteNode
let moveDown = SKAction.moveBy(CGVectorMake(0, -120), duration: 1) let moveUp = SKAction.move
An alternative to @Whirlwind 's answer, in case you have a bunch of actions that need to be paused that are not in a group and not just the movement, is to just pause the node itself. All SKNodes have a paused property associated with it.
paused
Ex. square.paused = true
square.paused = true