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iOS

Pause SKAction

I am currently making a flappy bird clone, and I have a function that runs the move pipe action forever once I touched the play button.(it only calls that function once in touchesBegin) How do I stop moving the pipes off the screen. (pause runActionForever ?)

override func didMoveToView(vuew: SKView){ var endlessAction = SKAction.runActionForever(spawn, delay) }