Sprite-Kit Obstacle Game - PhysicsBody issues - ios

Question

I have created a simple 2D arcade game using SpriteKit and I am trying to add a scoring system.Basically the game is a square sprite which has to jump over various obstacles.
What I have tried so far is creating an SKSpriteNode() which adds +1 to the score counter label when it contacts the player's physicsBody. My problem is that when they contact each other the player sprite floats over the gap's PhysicsBody. I have set it's collisionBitMask to 0 and have made it isDynamic = false. Can anybody help?
Okay so here's my gap's code
var gap = SKNode()
gap.position = CGPoint(x: obstacle.position.x, y: platform.position.y + 210)
gap.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: 30, height: 70))
gap.physicsBody!.isDynamic = true
gap.physicsBody!.affectedByGravity = false
gap.physicsBody?.contactTestBitMask = PhysicsCategory.Player
gap.physicsBody?.categoryBitMask = PhysicsCategory.Gap
gap.physicsBody?.collisionBitMask = PhysicsCategory.None
gap.physicsBody?.restitution = 0
gap.physicsBody?.friction = 0
self.addChild(gap)
And here's my players code
let playerTexture = SKTexture(imageNamed: "white.jpg")
player = SKSpriteNode(texture: playerTexture)
player.size = CGSize(width: 40, height: 40)
player.physicsBody = SKPhysicsBody(rectangleOf: player.size)
player.physicsBody!.isDynamic = false
player.position = CGPoint(x: self.frame.midX - 100 , y: self.frame.midY + 50 )
player.physicsBody!.restitution = 0
player.physicsBody!.friction = 0
player.physicsBody?.categoryBitMask = PhysicsCategory.Player
player.physicsBody?.contactTestBitMask = PhysicsCategory.Obstacles | PhysicsCategory.Gap
player.physicsBody?.collisionBitMask = PhysicsCategory.Obstacles | PhysicsCategory.Floor
self.addChild(player)
Physics Category is
struct PhysicsCategory {
static let None : UInt32 = 0
static let Obstacles : UInt32 = 0b1 // 1
static let Player : UInt32 = 0010
static let Floor : UInt32 = 0100
static let Gap : UInt32 = 1000
}