import SpriteKit class GameScene: SKScene, SKPhysicsContactDelegate { // カテゴリを用意しておく。 let redCategory: UInt32 = 0x1 << 0 let greenCategory: UInt32 = 0x1 << 1 override func didMoveToView(view: SKView) { // デリゲートをselfにしておく。 self.physicsWorld.contactDelegate = self self.size = view.bounds.size self.physicsBody = SKPhysicsBody(edgeLoopFromRect: self.frame) self.physicsWorld.gravity = CGVectorMake(0.0,
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