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我试图将游戏手柄控制器固定在我的相机节点的左下角,但是当我添加节点作为我的相机的一个孩子它不显示?SpriteKit - 节点不添加到SKCameraNode - 斯威夫特
let gameCamera = SKCameraNode()
var joypadBackground : SKSpriteNode = SKSpriteNode(imageNamed: "a")
override func didMove(to view: SKView) {
//Set game camera
self.camera = gameCamera
joypadBackground.position = convert(CGPoint(x: 0, y: 0), to: gameCamera)
joypadBackground.size = CGSize(width: 50, height: 50)
joypadBackground.zPosition = 1000
gameCamera.addChild(joypadBackground)
}