我在理解UIGestureRecognizers时遇到了问题。我现在的目标是拥有一组GestureRecognizers来执行不同的任务，例如:overridefuncviewDidLoad(){mainScene=GameScene(size:self.view.bounds.size)main=viewas!SKViewmainScene.panRecognizer=UIPanGestureRecognizer(target:self,action:#selector(shiftView(recognizer:)))main.addGestureRecognizer(mainSce