How to make SKSpriteNodes interact?

Question

iOS

I already did everything, but for some reason the interaction of objects in didBegin does not work
What code I have:

enemy.physicsBody = SKPhysicsBody(rectangleOf: enemy.size)
        enemy.physicsBody?.isDynamic = false
        enemy.physicsBody?.categoryBitMask = enemyCategory
        enemy.physicsBody?.contactTestBitMask =  playerCategory
        enemy.physicsBody?.collisionBitMask = 0
        enemy.name = "enemy"
        enemy.physicsBody?.usesPreciseCollisionDetection = true

player = SKSpriteNode(imageNamed: "player")
        player.size = CGSize(width: player.size.width/3, height: player.size.height/3)
        player.position = CGPoint(x: frame.size.width/4, y: frame.size.height/3)
        player.zPosition = 15
        
        player.name="player"
        player.physicsBody = SKPhysicsBody(circleOfRadius: player.size.width/2)
        player.physicsBody!.isDynamic = false
        player.physicsBody?.usesPreciseCollisionDetection = false

And of course at the very beginning he wrote:
self.physicsWorld.contactDelegate = self
What else is missing ?? What else is needed so that objects can interact?