大佬教程收集整理的这篇文章主要介绍了ios – 使用SKShapeNode绘制一条线,大佬教程大佬觉得挺不错的,现在分享给大家,也给大家做个参考。
到目前为止,这是我的代码:
var line = SKShapeNode() var ref = CGPathCreateMutable() override func touchesBegan(touches: NSSet,withEvent event: UIEvent) { for touch: AnyObject in touches { let LOCATIOn = touch.LOCATIOnInNode(self) } } override func touchesMoved(touches: NSSet,withEvent event: UIEvent) { for touch: AnyObject in touches { let LOCATIOnInScene = touch.LOCATIOnInNode(self) CGPathMoveToPoint(ref,nil,LOCATIOnInScene.x,LOCATIOnInScene.y) CGPathAddLineToPoint(ref,LOCATIOnInScene.y) line.path = ref line.lineWidth = 4 line.fillColor = UIColor.redColor() line.strokeColor = UIColor.redColor() self.addChild(linE) } }
每当我运行它并尝试绘制一条线时,应用程序崩溃并出现错误:
原因:’尝试添加已有父级的SKNode:SKShapeNode@L_197_5@:'(null)’accumulationFrame:{{0,0},{0,0}}’
为什么会这样?
var ref = CGPathCreateMutable() override func touchesBegan(touches: NSSet,withEvent event: UIEvent) { if let touch = touches.anyObject() as? UITouch { let LOCATIOn = touch.LOCATIOnInNode(self) CGPathMoveToPoint(ref,LOCATIOn.x,LOCATIOn.y) } } override func touchesMoved(touches: NSSet,withEvent event: UIEvent) { for touch: AnyObject in touches { let LOCATIOnInScene = touch.LOCATIOnInNode(self) var line = SKShapeNode() CGPathAddLineToPoint(ref,LOCATIOnInScene.y) line.path = ref line.lineWidth = 4 line.fillColor = UIColor.redColor() line.strokeColor = UIColor.redColor() self.addChild(linE) } }
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