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Documentation says that parent SKView object has a paused property. Set it to YES to pause the scene.

Paused

A Boolean value that indicates whether the view’s scene animations are paused.

@property(getter=isPaused, nonatomic) BOOL paused

Discussion If the value is YES, then the scene’s content is fixed on screen. No actions are executed and no physics simulation is performed."

//the parent SKView
spriteView =(SKView*) self.view;//pause button-(IBAction)goPauseButton {if(!spriteView.paused){
        spriteView.paused = YES;}else{
        spriteView.paused = NO;}}