import SpriteKit class GameScene: SKScene, SKPhysicsContactDelegate { override func didMoveToView(view: SKView) { self.physicsWorld.gravity = CGVectorMake(0.0, -1.0) self.size = view.bounds.size self.physicsBody = SKPhysicsBody(edgeLoopFromRect: self.frame) // 赤い正方形の設定。 let redSquare = SKSpriteNode(color: UIColor.redColor(), size: CGSizeMake(50, 50)) redSquare.position = CGPoint( x: CGRectGetMidX(
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