ios - .applyimpulse 不适用于 Xcode 8.3.3 中的 SKSpriteNode()

Question

我一直在尝试遵循 YouTube 上的 Pong 指南(我是 SpriteKit 的新手)，当我在 Xcode 8.3.3 中运行我的代码时，球没有移动。该指南使用 Xcode 8，因此一定有所改变。这是我的 GameScene.swift 代码:

import SpriteKit
import GameplayKit

class GameScene: SKScene {

var Ball = SKSpriteNode()
var comPaddle = SKSpriteNode()
var mainPaddle = SKSpriteNode()

override func didMove(to view: SKView) {

    Ball = self.childNode(withName: "Ball") as! SKSpriteNode
    mainPaddle = self.childNode(withName: "mainPaddle") as! SKSpriteNode
    comPaddle = self.childNode(withName: "comPaddle") as! SKSpriteNode

    Ball.physicsBody?.isDynamic = true;
    Ball.physicsBody?.applyImpulse(CGVector(dx: 20, dy: 20))


    let border = SKPhysicsBody(edgeLoopFrom: self.frame)

    border.friction = 0
    border.restitution = 1

    self.physicsBody = border
}


override func update(_ currentTime: TimeInterval) {
    // Called before each frame is rendered
}
}

Answer 1

正如 Simone Pistecchia 所指出的，我没有创建物理体。我使用以下命令执行此操作:

Ball.physicsBody = SKPhysicsBody(circleOfRadius: Ball.size.width)