ios - restitution (bouncing) not working - 


import spritekit  class gamescene: skscene {     override func didmovetoview(view: skview) {         /* setup scene here */          let border = skphysicsbody(edgeloopfromrect: self.frame)          border.friction = 0         self.physicsbody = border         self.physicsworld.gravity = cgvectormake(0, 0)         let ball = childnodewithname ("ball") skspritenode         ball.physicsbody?.applyimpulse(cgvectormake(30, -30))         ball.physicsbody?.allowsrotation = false         ball.physicsbody?.restitution = 1          ball.physicsbody?.lineardamping = 0         ball.physicsbody?.angulardamping = 0      }      override func touchesbegan(touches: nsset, withevent event: uievent) {         /* called when touch begins */             }      override func update(currenttime: cftimeinterval) {         /* called before each frame rendered */     } }


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