objective c - SpriteKit physicsBody applyImpulse node fails -

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I am trying to create a jump event on touch screen action, but after applying Fails by the bottom of the screen) All things look good with some parameters, but sometimes it happens.

Code:

[Apply self.physicsBody effect: CGVectorMake (dx / mag * kImpuleScale, 20.0f)];

You can put a physics around your screen: 

 < Code> var borderBody = SKPhysicsBody (edgeLoopFromRect: self.frame) self.physicsBody = borderBody   
 Then any body "escape"

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