Label not showing up (Swift 4 SpriteKit) - swift

Question

I am making a game in Xcode with Swift 4, SpriteKit. My crash detection is working, however when I try to make text appear onto the screen when the player crashes, the text doesn't appear. My game basically has the use control a rocket ship which must dodge meteors, the player also has the ability to fire bullets. I have detected when the rocket ship hits a meteor but cannot get text to appear onto the screen. I know for a fact that the crash detection is working, because whenever I add a print statement in the didBegin function, the print statement executes. So it must be that way im displaying the label, but im not sure what I'm doing wrong with the label.
Here's my code:
import SpriteKit
import GameplayKit
import UIKit
class GameScene: SKScene, SKPhysicsContactDelegate{
let player = SKSpriteNode(imageNamed: "spaceship")
let stars = SKSpriteNode(imageNamed: "stars")
let meteor = SKSpriteNode(imageNamed: "meteor")
override func didMove(to view: SKView) {
physicsWorld.contactDelegate = self
print(frame.size.width)
print(frame.size.height)
stars.position = CGPoint(x:0, y:0)
stars.zPosition = 1
player.position = CGPoint(x:0, y:-320)
player.zPosition = 4
player.physicsBody = SKPhysicsBody(circleOfRadius: player.size.width / 2)
player.physicsBody?.affectedByGravity = false
player.physicsBody?.isDynamic = false
player.physicsBody?.categoryBitMask = 2
player.physicsBody?.collisionBitMask = 1
player.physicsBody?.contactTestBitMask = 1
self.addChild(player)
self.addChild(stars)
self.addMeteor()
}
func didBegin(_ contact: SKPhysicsContact) {
gameOver()
}
func addMeteor() {
meteor.physicsBody = SKPhysicsBody(circleOfRadius: meteor.size.width / 2)
meteor.physicsBody?.affectedByGravity = false
meteor.setScale(0.50)
meteor.position = CGPoint(x:Int(arc4random()%300),y:Int(arc4random()%600))
//meteor.position = CGPoint(x:0 , y:0)
meteor.zPosition = 4
meteor.physicsBody?.categoryBitMask = 1
meteor.physicsBody?.collisionBitMask = 0
meteor.physicsBody?.contactTestBitMask = 2
self.addChild(meteor)
}
func fireBullet() {
let bullet = SKSpriteNode(imageNamed: "bullet")
bullet.position = player.position
bullet.setScale(0.5)
bullet.zPosition = 3
self.addChild(bullet)
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)
}
func gameOver() {
print("Game Over!")
var gameOverLabel: SKLabelNode!
gameOverLabel = SKLabelNode(fontNamed: "Chalkduster")
gameOverLabel.text = "Game Over! You lost!"
gameOverLabel.horizontalAlignmentMode = .right
gameOverLabel.position = CGPoint(x: 0, y:0)
self.addChild(gameOverLabel)
print("Label added")
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
fireBullet()
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch: AnyObject in touches {
let pointOfTouch = touch.location(in: self)
let previousPointOfTouch = touch.previousLocation(in: self)
let amountDragged = pointOfTouch.x - previousPointOfTouch.x
player.position.x += amountDragged
}
}
override func update(_ currentTime: TimeInterval) {
meteor.position.y -= 6
if meteor.position.y < player.position.y - 300{
meteor.removeFromParent()
addMeteor()
}
}
}
Not sure what I'm doing wrong? I call the gameOver() function in didBegin which is supposed to be executed every time collision is detected. But nothing happens? The meteor simply goes past the rocket ship. If someone could help me that'd be awesome!

Answer 1

As i see you are trying to center the label on the screen, you may try to add this to your code, on gameover func:
1.Try change the position to this
gameOverLabel.position = CGPoint(x: (self.scene!.frame.width / 2) - (self.scene!.frame.width * self.scene!.anchorPoint.x) / 2, y:(self.scene!.frame.height / 2) - (self.scene!.frame.height * self.scene!.anchorPoint.y))
2.I don't know if you have something that is over the label and affecting its view, so try to:
gameOverLabel.zPosition = 10 //A number higher than any other zPosition
3.The label may be too small...try:
gameOverLabel.fontSize = 30 //Adjust it to what you want
4.Just a tip:
move the:
var gameOverLabel: SKLabelNode!
to next line after the
let meteor = SKSpriteNode(imageNamed: "meteor")
This way you will have a universal label, and do not have to regenerate the label every time.
If you do this, just a final tip...I don't know if you have a func like gameRestart() or something like this...but make sure that when you restart the game, you remove the label:
gameOverLabel.removeFromParent()
If you don't do this, when the app try to add the label again it will crash!
Hope it helps!

Answer 2

You are not moving any of your objects as far as your physics in concerned. You need to apply forces instead of manually moving a position. Also your player dynamic is set to false, which means that he never moves, so contacts only happen on the meteor end.