Swift SpritKit : background image move

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#Swift Spirte Kit# ##Background Image move# 如何連續移動背景圖，先看原理
先將 img-1 從 view 之中移動到 view 的下方直到看不到在移動回到 view 之中 再設定一組 img-2 從 view 的上面移動到 view 之中再回到 view 的上方 記住兩組的移動時間必須一至的 如何開始 宣告兩組變數 ``` var background = SKSpriteNode() var background02 = SKSpriteNode() ``` 設定第一組圖片 ``` background = SKSpriteNode(imageNamed: "image name") background.size = CGSize(width: self.size.width, height: self.size.height) background.position.y = self.size.height background.zPosition = -1 self.addChild(background) let move1 = SKAction.moveTo(y: self.frame.midY, duration: 30) let move2 = SKAction.moveTo(y: self.size.height, duration: 0) let seq = SKAction.sequence([move1,move2]) background.run(SKAction.repeatForever(seq)) ``` 設定第二組圖片 ``` background02 = SKSpriteNode(imageNamed: "country-platform-back") background02.size = CGSize(width: self.size.width, height: self.size.height) background02.zPosition = -1 background02.position.y = self.frame.midY //+ background02.size.height self.addChild(background02) let move3 = SKAction.moveTo(y: -self.size.height, duration: 30) let move4 = SKAction.moveTo(y: self.frame.midY , duration: 0) let seq1 = SKAction.sequence([move3,move4]) background02.run(SKAction.repeatForever(seq1)) ```

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