使用 SkSpriteNode 旋转对象 [英] Turning Object with SkSpriteNode

问题描述

我有一个名为Ghost"的图像，它在整个屏幕上移动.我想让 SpriteNode 在不被按下的情况下不断转动.

I have an image named "Ghost" and it moves throughout the screen. I want to have the SpriteNode constantly turning without being pressed on.

Ghost = SKSpriteNode(imageNamed: "Ghost1")
    Ghost.size = CGSize(width: 50, height: 50)
    Ghost.position = CGPoint(x: self.frame.width / 2 - Ghost.frame.width, y: self.frame.height / 2)
    Ghost.physicsBody = SKPhysicsBody(circleOfRadius: Ghost.frame.height / 1.4)
    Ghost.physicsBody?.categoryBitMask = PhysicsCatagory.Ghost
    Ghost.physicsBody?.collisionBitMask = PhysicsCatagory.Ground | PhysicsCatagory.Wall
    Ghost.physicsBody?.contactTestBitMask = PhysicsCatagory.Ground | PhysicsCatagory.Wall | PhysicsCatagory.Score
    Ghost.physicsBody?.affectedByGravity = false
    Ghost.physicsBody?.isDynamic = true
    Ghost.zPosition = 2

    self.addChild(Ghost)

我在 Stack Overflow 上寻找了一些答案，但我似乎找不到任何有同样问题的人，请帮忙.

I have looked for some answers on Stack Overflow but I can't seem to find any one with this same question, please help.

推荐答案

您可以施加一个角度类型的力，以旋转主体，并关闭阻尼使其永远继续旋转:

You could apply a force of an angular type, so as to rotate the body, and turn off damping so it continues to rotate forever:

https://developer.apple.com/reference/spritekit/skaction/1417775-applyangularimpulse

首先，通过将其设置为 true 来确保它能够旋转:

Firstly, make sure it’s able to rotate by setting this to true:

https://developer.apple.com/reference/spritekit/skphysicsbody/1519986-允许旋转

确保没有角度阻尼，以免旋转速度减慢:

Make sure there’s no angular damping so that it doesn’t slow in rotation rate:

https://developer.apple.com/reference/spritekit/skphysicsbody/1519913-angulardamping

现在通过施加扭矩使其旋转:

Now make it spin by applying a torque:

https://developer.apple.com/reference/spritekit/skphysicsbody/1519588-applytorque

https://developer.apple.com/reference/spritekit/skphysicsbody/1519766-角速度

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