iOS: How to set programmatic alpha mask of SKSpriteNode

Question

I am able to set the alpha mask of my own custom object in the .sks file of the project, but I'm not sure how to do it programmatically.

Answer 1

UPDATE: Just figured it out.

let presetTexture = SKTexture(imageNamed: "YOURIMAGE.png")
presetObject = SKSpriteNode(texture: presetTexture)
presetObject.physicsBody = SKPhysicsBody(texture: presetTexture, size: presetTexture.size())