swift - Swift Playgrounds Brick Breaker，通过鼠标移动 -> 如何通过键盘移动

Question

我正在玩 Swift Playground Brick Breaker。示例代码桨正在通过鼠标移动。现在我想使用键盘左键和右键移动桨。你能给我一些快速的代码吗？

这是 Paddle.swift 代码（通过鼠标移动）

import Foundation

public class Paddle: Sprite {

var collisionSound: GameSound = .warpMono

/// Allows you to move the bar back and forth with touch.
public func enableHorizontalTracking(in scene: Scene) {
    scene.trackTouch(withSprite: self)
}

/// Disable touch control of the bar.
public func disableHorizontalTracking(in scene: Scene) {
    scene.stopTrackingTouch(withSprite: self)
}
    
/// Set the bar to its initial value setting.
public init(image: Image) {
    super.init(graphicType: .sprite, name: "paddle")
    self.image = image
    xScale = 1.30
    friction = 0.1
    interactionCategory = .paddle
    collisionCategories = [.ball]
    collisionNotificationCategories =  [.ball]
    
    setOnCollisionHandler { collision in
        let position = collision.spriteB.position
        self.playCollisionSound(self.collisionSound, at: position, using: self.collisionSoundSource)
    }
    disablesOnDisconnect = true
}

var collisionSoundSource = Graphic(shape: .circle(radius: 4), color: .clear, name: "impact")
}