ios - Swift/SpriteKit 帮助 : Increase CGFloat continuously to allow continuous rotation around a fixed point

Question

我正在使用苹果的 SpriteKit 和 Swift 制作一个简单的游戏，并且遇到了问题。我试图让桨节点(paddle)围绕圆内的固定节点(anchorNode)连续旋转；但是，我无法弄清楚如何使桨节点(paddle)继续围绕定点节点(anchorNode)旋转，因为 SKAction.rotateByAngle 语句中的约束使其在一定时间/旋转后结束。

非常感谢任何帮助!

这是我的引用代码:

    //Setting up anchor Node

    anchorNode.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
    anchorNode.size.height = (self.frame.size.height / 1000)
    anchorNode.size.width = anchorNode.size.height
    self.addChild(anchorNode)


    //Setting up achor Node's physucs

    anchorNode.physicsBody = SKPhysicsBody(circleOfRadius: (circle.frame.size.height / 1000))
    anchorNode.physicsBody?.dynamic = false
    anchorNode.physicsBody?.affectedByGravity = false
    anchorNode.physicsBody?.friction = 0


    //Making the anchor Node rotate

    let rotate = SKAction.rotateByAngle(CGFloat(3.14), duration: NSTimeInterval(1.5))
    anchorNode.runAction(rotate)



    //Setting up the paddle node

    paddle.position = CGPointMake((circle.frame.width / 2), 0)
    paddle.size.height = (self.frame.size.height / 50)
    paddle.size.width = (self.frame.size.width / 7)

    anchorNode.addChild(paddle)

Answer 1

尝试添加此代码。

override func update(currentTime: NSTimeInterval) {
//How to make it spin
let speed = CGFloat(5)
let degreeRotation = CDouble(speed) * M_PI / 180
paddle.zRotation -= CGFloat(degreeRotation)
}