创建具有物理体的SKSprite节点的函数

func createPhysicalSprite(imageNamed: String, size: CGSize, position: CGPoint, physicsBody: SKPhysicsBody) -> SKSpriteNode {
    let sprite = SKSpriteNode(imageNamed: imageNamed)
    sprite.size = size
    sprite.position = position
    sprite.physicsBody = physicsBody
    return sprite
}

let size = CGSize(width: 100, height: 100)
let position = CGPoint(x: 200, y: 200)
let physicsBody = SKPhysicsBody(rectangleOf: size)
let sprite = createPhysicalSprite(imageNamed: "spriteImage", size: size, position: position, physicsBody: physicsBody)