Swift Spritekit Change Frame Shape - swift

Question

I am making a IOS game in Swift using Spritekit, the player has a triangular mesh, that I create with this code:
let viewpath = CGPathCreateMutable();
CGPathMoveToPoint(viewpath, nil, 200, 0);
CGPathAddLineToPoint(viewpath, nil, 0, 400);
CGPathAddLineToPoint(viewpath, nil, 400, 400);
CGPathAddLineToPoint(viewpath, nil, 200, 0);
let playerviewshape = SKShapeNode(path: viewpath);
playerviewshape.fillColor = SKColor(red: 1, green: 1, blue: 1, alpha: 0.1)
playerviewshape.strokeColor = SKColor(red: 1, green: 1, blue: 1, alpha: 0.2)
playerview = SKSpriteNode(texture: view.textureFromNode(playerviewshape));
playerview.zPosition = 0;
playerview.position = CGPoint(x: 0, y: 200);
player.addChild(playerview);
I want to know if any enemies are inside the triangle, So in the update loop I use if(enemy.intersectsNode(playerview)) { however this only checks if it is inside the node's frame, Which is a rectangle around the triangle. I have tried using the triangle as a SKShapeNode and I have also tried using containsPoint instead of intersectsNode.
How can I change the frame/the way I detect intersections, so it will only detect the sprites if they are inside the triangle?

Answer 1

I write some code that can be useful to starting to set your physics:
(P.S. I dont know which type was player so I use playerview just to make an example..)
enum CollisionTypes: UInt32 {
case Playerview = 1 // my hero
case WarField = 2 // the warfield
case Enemy1 = 4 // simple enemies type
case Enemy2 = 8 // 2 level enemies type
case Enemy3 = 16 // boss enemies type
case Enemy4 = 32 // boss of the boss enemies type
}
playerview.physicsBody = SKPhysicsBody(texture: texture, size: texture.size())
playerview.physicsBody!.categoryBitMask = CollisionTypes.Playerview.rawValue
playerview.physicsBody!.contactTestBitMask = CollisionTypes.Enemy1.rawValue | CollisionTypes.Enemy2.rawValue | CollisionTypes.Enemy3.rawValue | CollisionTypes.Enemy4.rawValue
playerview.physicsBody!.collisionBitMask = 0
func didBeginContact(contact: SKPhysicsContact) {
if (contact.bodyA.categoryBitMask == CollisionTypes.Playerview.rawValue &&
contact.bodyB.categoryBitMask == CollisionTypes.Enemy1.rawValue) {
print("The collision was between the playerview and a enemy1")
}
...
}