如何通过角度移动SpriteNode？

import SpriteKit

class GameScene: SKScene {
    var sprite: SKSpriteNode!

    override func didMove(to view: SKView) {
        sprite = SKSpriteNode(imageNamed: "player")
        sprite.position = CGPoint(x: size.width / 2, y: size.height / 2)
        addChild(sprite)
    }

    func moveSprite(angle: CGFloat, speed: CGFloat, duration: TimeInterval) {
        let direction = CGVector(dx: cos(angle), dy: sin(angle))
        let distance = speed * CGFloat(duration)
        let moveAction = SKAction.move(by: direction * distance, duration: duration)
        sprite.run(moveAction)
    }

    override func update(_ currentTime: TimeInterval) {
        // 假设我们想要每帧移动 sprite
        let angleInRadians = CGFloat.pi / 4 // 45度角
        moveSprite(angle: angleInRadians, speed: 100, duration: 1)
    }
}