parent physicsBody doesn't work - swift

Question

I have a GameScene.sks and Player.sks. Player.sks stores player sprite, that consists of 3 parts (body, hand[child of body] and lantern[child of hand]). In the custom class of this scene I create playerTexture from image and set it as physics body.
let playerTexture = SKTexture(imageNamed: "player_outline")
parent!.physicsBody = SKPhysicsBody(texture: playerTexture, size: playerTexture.size())
I add player scene reference to the Game Scene. And when I move player, physics body staying behind sprite and don't move at all. If I don't use 'parent!' it will work, but physics body will have offset.
But if I create physics body from the Scene Editor, it works! What's happening?
Player.swift
class PlayerNode: SKSpriteNode, EventListenerNode {
func didMoveToScene() {
let playerTexture = SKTexture(imageNamed: "player_outline")
parent!.physicsBody = SKPhysicsBody(texture: playerTexture, size: playerTexture.size())
parent!.physicsBody!.categoryBitMask = PhysicsCategory.Player
parent!.physicsBody!.collisionBitMask = PhysicsCategory.Wall
}
}
GameScene.swift
var player: PlayerNode!
player = childNode(withName: "//player") as! PlayerNode
Player.swift
Player's body called 'player', arm called 'lanternArm' and it is a child of 'player', lantern called 'lantern' and it is a child of 'lanternArm'.

Answer 1

With this code:
> parent!.physicsBody = SKPhysicsBody(texture: playerTexture, size:
> playerTexture.size())
You are defining the physicsBody of player's parent, not player itself. Is that what you want to do? What is player's parent?
If I don't use 'parent!' it will work,
So you have this:
physicsBody = SKPhysicsBody(texture: playerTexture, size: playerTexture.size())
Now you are defining players physics body.
but physics body will have offset.
Check the anchorPoint of player. If it's (0, 0) that will give you an offset physicsBody.