SpriteKit PhysicsBody不适用于我的贝塞尔曲线

Question

这是测试代码：

var paths = UIBezierPath()
var bottomLeft = CGPoint(x: dim.minX, y:dim.minY)
var bottomRight = CGPoint(x: dim.maxX , y: dim.minY )
var topRight = CGPoint(x: dim.maxX, y: dim.maxY )
var topLeft = CGPoint(x: dim.minX, y: dim.maxY)


paths.moveToPoint(bottomRight)
paths.addLineToPoint(topRight)

paths.moveToPoint(topRight)
paths.addLineToPoint(topLeft)

paths.moveToPoint(topLeft)
paths.addLineToPoint(bottomLeft)

paths.moveToPoint(bottomLeft)
paths.addLineToPoint(bottomRight)


var n = SKShapeNode(path: paths.CGPath)
n.strokeColor = UIColor.greenColor()
n.physicsBody = SKPhysicsBody(edgeLoopFromPath: paths.CGPath)
shapeLayer.addChild(n)

它绘制了一个标准的矩形。我将在topRight到topLeft点的中间添加一些曲线，但我想用简单的rect测试它。我正在用球测试碰撞，它似乎只是从bottomRight到topRight的线路碰撞而忽略了其余部分。有没有人知道这里有什么？

Answer 1

虽然我不确定贝塞尔路径和物理碰撞设置代码所需的问题，但我能够使用原始路径和添加行来使用它：

    var polygonPath = CGPathCreateMutable()
    CGPathMoveToPoint(polygonPath, nil, bottomRight.x, bottomRight.y)
    CGPathAddLineToPoint(polygonPath, nil, topRight.x, topRight.y)
    CGPathAddLineToPoint(polygonPath, nil, topLeft.x, topLeft.y)
    CGPathAddLineToPoint(polygonPath, nil, bottomLeft.x, bottomLeft.y)
    CGPathCloseSubpath(polygonPath)

    var n = SKShapeNode(path: polygonPath)
    n.strokeColor = UIColor.grayColor()
    n.physicsBody = SKPhysicsBody(edgeLoopFromPath: polygonPath)

设置适当的物理碰撞界限。虽然这解决了我的问题，但是对于为什么原始代码不能使用贝塞尔路径的任何见解都会很棒。感谢。