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Swift SKShapeNode shapeWithSplinePoints

转载 作者:行者123 更新时间:2023-11-30 13:26:48 26 4
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我正在尝试为要遵循的节点创建 CGPath,但是当我尝试使用 608_hd_best_practices_for_building_spritekit_games 中的操作和常量幻灯片中定义的 SKShapeNode 时,我收到错误调用中的额外参数“计数”。有什么想法吗?

import SpriteKit

class GameScene: SKScene {
var groundNode: SKSpriteNode? = SKSpriteNode()
var path = [CGPoint]()

override func didMoveToView(view: SKView) {
groundNode = childNodeWithName("ground") as? SKSpriteNode
}

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
path = [CGPoint]()
}

override func touchesMoved(touches: NSSet, withEvent event: UIEvent) {
var newPoint = touches.anyObject()?.locationInNode(groundNode)
path.append(newPoint!)
}

override func touchesEnded(touches: NSSet, withEvent event: UIEvent) {
let sprite = SKSpriteNode(imageNamed:"Spaceship")

sprite.xScale = 0.25
sprite.yScale = 0.25
sprite.position = path.first!

groundNode?.addChild(sprite)

// TODO: this currently isnt working
let count = path.count
// CGPathRef p = [SKShapeNode shapeWithSplinePoints:points]
let p: CGPathRef = SKShapeNode(splinePoints: path, count: count)

let speed:CGFloat = 1.0

let action = SKAction.followPath(p, speed: speed)
sprite.runAction(action)
}

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

最佳答案

init(splinePoints:count:)需要 UnsafeMutablePointer<CGPoint> (即 CGPoint 的 C 数组)和一个无符号整数作为其参数。它还返回 SKShapeNode对象不是 CGPathRef 。尝试以下操作...

let p = SKShapeNode(splinePoints: &path, count: UInt(count))

编辑:也进行以下更改

let speed:CGFloat = 1.0

let action = SKAction.followPath(p.path, speed: speed)
sprite.runAction(action)

关于Swift SKShapeNode shapeWithSplinePoints,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37086510/

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