所以我下面有我的“Floor.swift”类，它基本上是一堆墙。我有来自屏幕顶部的对象，一旦Floor和SKSpriteNodes发生碰撞，我希望SKSpriteNode被移除。下面是我的Floor类。importFoundationimportSpriteKitclassFloor:SKNode{overrideinit(){super.init()letleftWall=SKSpriteNode(color:UIColor.brown,size:CGSize(width:5,height:50))leftWall.position=CGPoint(x:0,y:50)leftWall