我如何继续在屏幕右侧的随机位置生成一个SKSpriteNode，以便从左侧的这个随机位置转换它？

import SpriteKit

class GameScene: SKScene {
    override func didMove(to view: SKView) {
        generateSpriteNode()
    }
    
    func generateSpriteNode() {
        let spriteNode = SKSpriteNode(color: .red, size: CGSize(width: 50, height: 50))
        
        let randomY = CGFloat(arc4random_uniform(UInt32(size.height)))
        let randomX = size.width + spriteNode.size.width/2
        
        spriteNode.position = CGPoint(x: randomX, y: randomY)
        addChild(spriteNode)
        
        let moveAction = SKAction.moveTo(x: -spriteNode.size.width/2, duration: 2.0)
        spriteNode.run(moveAction) {
            spriteNode.removeFromParent()
        }
    }
}