Swift Sprite Collision. Objects passing Through walls - swift

Question

I'm making a simple game(using Swift & SpriteKit), where I have a circle that can be dragged around. but the circle is not allowed to go through walls.
My collision BitMask works perfectly, but when I drag fast enough, the circle ends up going through the walls.
The Initialisation of the Player Sprite goes Like this:
func initPlayerSprite(){
let playerTexture = SKTexture(imageNamed: "player.png")
let originX = CGRectGetMidX(self.frame)
let originY = CGRectGetMidY(self.frame)
player = SKSpriteNode(texture: playerTexture, size: CGSize(width: 26, height: 26))
player.position = CGPoint(x: originX , y: originY)
player.physicsBody = SKPhysicsBody(circleOfRadius: playerTexture.size().height/2)
player.physicsBody!.dynamic = true
player.physicsBody?.allowsRotation = false
player.physicsBody!.categoryBitMask = ColliderType.Player.rawValue
player.physicsBody!.contactTestBitMask = ColliderType.Floor.rawValue + ColliderType.Gap.rawValue
player.physicsBody!.collisionBitMask = ColliderType.Wall.rawValue + ColliderType.Floor.rawValue
self.addChild(player)
}
My code for moving the Sprite goes like this:
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?){
var nodeTouched = SKNode()
for touch: AnyObject in touches {
let location = touch.locationInNode(self)
let dx = -player.position.x + location.x
let dy = -player.position.y + location.y
let movePlayer = SKAction.moveBy(CGVector(dx: dx, dy: dy), duration: 0.02)
}
}
Any Idea how to make sure the collision detection work even at high velocities?

Answer 1

From your code its hard to judge.
Why are you calling the collisions like
ColliderType.Wall.rawValue + ColliderType....
I haven't seen this before with a "+" as a separator, usually you use a "|"
to separate them.
ColliderType.Wall.rawValue | ColliderType....
Using a plus should add the two values together and will not treat it as 2 collision types, as far as I understand. I might be wrong here.
Also did you try using precise collision detection like so?
...physicsBody.usesPreciseCollisionDetection = true.
Apple describes this bool as follows
The default value is NO. If two bodies in a collision do not perform precise collision detection, and one passes completely through the other in a single frame, no collision is detected. If this property is set to YES on either body, the simulation performs a more precise and more expensive calculation to detect these collisions. This property should be set to YES on small, fast moving bodies.
Not sure this is helping