ios - 如何创建带孔的 SKPhysicsBody？

Question

我想知道如何创建一个像这样更复杂的 SKPhysicsyBody？我想对黑色部分进行hittest。

我用 PaintCode 将这个形状导出到 CG 矩形。

var barrierpath2Path = UIBezierPath()
        barrierpath2Path.moveToPoint(CGPointMake(52, 26))
        barrierpath2Path.addLineToPoint(CGPointMake(52, 26))
        barrierpath2Path.addCurveToPoint(CGPointMake(26, 52), controlPoint1: CGPointMake(52, 40.36), controlPoint2: CGPointMake(40.36, 52))
        barrierpath2Path.addLineToPoint(CGPointMake(26, 52))
        barrierpath2Path.addCurveToPoint(CGPointMake(0, 26), controlPoint1: CGPointMake(11.64, 52), controlPoint2: CGPointMake(0, 40.36))
        barrierpath2Path.addLineToPoint(CGPointMake(0, 26))
        barrierpath2Path.addCurveToPoint(CGPointMake(26, 0), controlPoint1: CGPointMake(0, 11.64), controlPoint2: CGPointMake(11.64, 0))
        barrierpath2Path.addLineToPoint(CGPointMake(26, 0))
        barrierpath2Path.addCurveToPoint(CGPointMake(52, 26), controlPoint1: CGPointMake(40.36, 0), controlPoint2: CGPointMake(52, 11.64))
        barrierpath2Path.closePath()
        barrierpath2Path.moveToPoint(CGPointMake(46.8, 26))
        barrierpath2Path.addLineToPoint(CGPointMake(46.8, 26))
        barrierpath2Path.addCurveToPoint(CGPointMake(39, 18.2), controlPoint1: CGPointMake(46.8, 21.69), controlPoint2: CGPointMake(43.31, 18.2))
        barrierpath2Path.addLineToPoint(CGPointMake(39, 18.2))
        barrierpath2Path.addCurveToPoint(CGPointMake(31.2, 26), controlPoint1: CGPointMake(34.69, 18.2), controlPoint2: CGPointMake(31.2, 21.69))
        barrierpath2Path.addLineToPoint(CGPointMake(31.2, 26))
        barrierpath2Path.addCurveToPoint(CGPointMake(39, 33.8), controlPoint1: CGPointMake(31.2, 30.31), controlPoint2: CGPointMake(34.69, 33.8))
        barrierpath2Path.addLineToPoint(CGPointMake(39, 33.8))
        barrierpath2Path.addCurveToPoint(CGPointMake(46.8, 26), controlPoint1: CGPointMake(43.31, 33.8), controlPoint2: CGPointMake(46.8, 30.31))
        barrierpath2Path.closePath()
        barrierpath2Path.moveToPoint(CGPointMake(27.3, 14.74))
        barrierpath2Path.addLineToPoint(CGPointMake(27.3, 14.74))
        barrierpath2Path.addCurveToPoint(CGPointMake(19.5, 6.94), controlPoint1: CGPointMake(27.3, 10.43), controlPoint2: CGPointMake(23.81, 6.94))
        barrierpath2Path.addLineToPoint(CGPointMake(19.5, 6.94))
        barrierpath2Path.addCurveToPoint(CGPointMake(11.7, 14.74), controlPoint1: CGPointMake(15.19, 6.94), controlPoint2: CGPointMake(11.7, 10.43))
        barrierpath2Path.addLineToPoint(CGPointMake(11.7, 14.74))
        barrierpath2Path.addCurveToPoint(CGPointMake(19.5, 22.54), controlPoint1: CGPointMake(11.7, 19.05), controlPoint2: CGPointMake(15.19, 22.54))
        barrierpath2Path.addLineToPoint(CGPointMake(19.5, 22.54))
        barrierpath2Path.addCurveToPoint(CGPointMake(27.3, 14.74), controlPoint1: CGPointMake(23.81, 22.54), controlPoint2: CGPointMake(27.3, 19.05))
        barrierpath2Path.closePath()
        barrierpath2Path.moveToPoint(CGPointMake(27.3, 37.26))
        barrierpath2Path.addLineToPoint(CGPointMake(27.3, 37.26))
        barrierpath2Path.addCurveToPoint(CGPointMake(19.5, 29.46), controlPoint1: CGPointMake(27.3, 32.95), controlPoint2: CGPointMake(23.81, 29.46))
        barrierpath2Path.addLineToPoint(CGPointMake(19.5, 29.46))
        barrierpath2Path.addCurveToPoint(CGPointMake(11.7, 37.26), controlPoint1: CGPointMake(15.19, 29.46), controlPoint2: CGPointMake(11.7, 32.95))
        barrierpath2Path.addLineToPoint(CGPointMake(11.7, 37.26))
        barrierpath2Path.addCurveToPoint(CGPointMake(19.5, 45.06), controlPoint1: CGPointMake(11.7, 41.57), controlPoint2: CGPointMake(15.19, 45.06))
        barrierpath2Path.addLineToPoint(CGPointMake(19.5, 45.06))
        barrierpath2Path.addCurveToPoint(CGPointMake(27.3, 37.26), controlPoint1: CGPointMake(23.81, 45.06), controlPoint2: CGPointMake(27.3, 41.57))
        barrierpath2Path.closePath()
        barrierpath2Path.miterLimit = 4;



        monster.physicsBody = SKPhysicsBody(polygonFromPath: barrierpath2Path.CGPath)

但是模拟器只显示一个孔(后面还有 png)？这里出了什么问题？

Answer 1

您很可能希望让孔的子节点具有自己的物理体。这将使所有事物都拥有自己的物理实体，并且可以毫无问题地相互移动

为了进一步详细说明这个答案，您还可以使用 SKPhysicsBody 便捷初始化器根据纹理中的 alpha 值创建物理体。这会导致性能下降，但应该按照您的意愿进行。

l.physicsBody = SKPhysicsBody(texture: l.texture, size: l.size)