Question

Here是我正在处理的问题的视频。正如你在视频中看到的那样，我移动一个灰色的球试图与红球碰撞。当两个物体发生碰撞时，没有发生弹跳，红球就会移动。我已经尝试过玩红球的密度，例如制作红球密度为0.00001。碰撞行为没有区别。

如何更改碰撞行为以便弹跳？

以下是灰球的属性：

func propertiesGrayBall() {
    gray = SKShapeNode(circleOfRadius: frame.width / 10 )
    gray.physicsBody = SKPhysicsBody(circleOfRadius: frame.width / 10 )
    gray.physicsBody?.affectedByGravity = false
    gray.physicsBody?.dynamic = true
    gray.physicsBody?.allowsRotation = false
    gray.physicsBody?.restitution = 1
}

以下是红球的属性：

func propertiesRedBall  {
    let redBall = SKShapeNode(circleOfRadius: self.size.width / 20
    redBall.physicsBody = SKPhysicsBody(self.size.width / 20)
    redBall.physicsBody?.affectedByGravity = false
    redBall.physicsBody?.dynamic = true
    redBall.physicsBody?.density = redBall.physicsBody!.density * 0.000001
    redBall.physicsBody?.allowsRotation = false
    redBall.physicsBody?.restitution = 1
}

以下是我如何移动灰球。

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
    if fingerIsOnGrayBall {
        let touch = touches.first
        var position = touch!.locationInView(self.view)
        position = self.convertPointFromView(position)
        grayBall.position = position
    }
}

主要修改 球最初有附件。我删除它们以简化问题。这就是为什么评论可能不会与代码相加。

Answer 1

如果通过设置其位置（直接或使用SKAction）移动节点（使用物理主体），该节点将不会成为物理模拟的一部分。相反，您应该通过施加力/脉冲或设置其速度来移动节点。以下是如何执行此操作的示例：

首先，定义一个变量来存储触摸的位置

class GameScene: SKScene {
    var point:CGPoint?

然后，从代码中删除以下语句

redBall.physicsBody?.density = redBall.physicsBody!.density * 0.000001

最后，添加以下触摸处理程序

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    /* Called when a touch begins */

    for touch in touches {
        let location = touch.locationInNode(self)

        let node = nodeAtPoint(location)
        if (node.name == "RedBall") {
            point = location
        }
    }
}

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
   /* Called when a touch begins */

    for touch in touches {
        let location = touch.locationInNode(self)
        if point != nil {
            point = location
        }
    }
}

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
    point = nil
}

override func update(currentTime: CFTimeInterval) {
    if let location = point {
        let dx = location.x - redBall.position.x
        let dy = location.y - redBall.position.y
        let vector = CGVector(dx: dx*100, dy: dy*100)
        redBall.physicsBody?.velocity = vector
    }
}

拖动对象与Sprite Kit

1 个答案: