Swift: SKAction not working on touch - ios

Question

Ive been trying to follow along swift tutorials and I've come across something extremely frustrating with every tutorial I have tried to follow along with, whenever SKAction is used I cannot follow along with any tutorials because my programs never work. This has happened with MULTIPLE programs and I can never figure it out.
Here is the code for the program:
import SpriteKit
import GameplayKit
class GameScene: SKScene{
let player = SKSpriteNode(imageNamed: "playerShip")
override func didMove(to view: SKView) {
let background = SKSpriteNode(imageNamed: "background")
background.size = self.size
background.position = CGPoint(x: self.size.width / 2, y: self.size.height / 2)
background.zPosition = -1
self.addChild(background)
player.setScale(1)
player.position = CGPoint(x: self.size.width / 2, y: self.size.height * 0.2)
player.zPosition = 2
self.addChild(player)
}
func fireBullet(){
let bullet = SKSpriteNode(imageNamed: "bullet")
bullet.setScale(1)
bullet.zPosition = 1
bullet.position = player.position
let moveBullet = SKAction.moveTo(y: self.size.height + bullet.size.height, duration: 1)
let deleteBullet = SKAction.removeFromParent()
let bulletSequence = SKAction.sequence([moveBullet, deleteBullet])
bullet.run(bulletSequence)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
fireBullet()
}
}
Whenever I build and run the program in the simulator everything is fine and the build succeeds. However whenever I click nothing happens, this happens every single time I attempt to do anything with SKAction. I should mention that the FPS at the bottom right corner of my screen changes every time I click, but nothing else happens, the node count stays the same, and the screen remains the same with the bullet not firing.
Here is the tutorial I am attempting to follow along with: https://www.youtube.com/watch?v=mvlwZs2ehLU

Answer 1

I noticed you aren't actually adding the bullet sprite to your scene after instantiating it. Make sure to add addChild(bullet). I suggest implementing something like this:
func fireBullet() {
let bullet = SKSpriteNode(imageNamed: "bullet")
bullet.setScale(1)
bullet.zPosition = 1
bullet.position = player.position
addChild(bullet)
let moveBullet = SKAction.moveTo(y: self.size.height + bullet.size.height, duration: 1.0)
let deleteBullet = SKAction.removeFromParent()
let bulletSequence = SKAction.sequence([moveBullet, deleteBullet])
bullet.run(bulletSequence)
}