How to make object move farther longer you hold down? - swift

Question

I am trying to create a program where the longer you hold down the screen the higher an object will move. I want to do it where the longer you hold down the longer the function repeats increasing the distance. However, for some reason it is not working.
import SpriteKit
import GameplayKit
var calculateTimer = Timer()
var distance = 10
var choice = 1
class GameScene: SKScene, SKPhysicsContactDelegate {
var planet = SKNode()
override func didMove(to view: SKView) { // viewdidload
let planetTexture = SKTexture(imageNamed: "mercury.jpg")
planet = SKSpriteNode(texture: planetTexture)
planet.position = CGPoint(x: self.frame.midX, y: self.frame.midY)
addChild(planet)
}
func calculateDistance() {
distance += 10
print(distance)
print(choice)
}
func touchDown(atPoint pos : CGPoint) {
calculateTimer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(self.calculateDistance), userInfo: nil, repeats: true)
print("test")
}
func touchUp(atPoint pos : CGPoint) {
planet.physicsBody!.isDynamic = true
//planet.physicsBody?.velocity = (CGVector(dx: 0, dy: 0))
planet.physicsBody!.applyImpulse(CGVector(dx: 0, dy: distance))
}
override func update(_ currentTime: TimeInterval) {
// Called before each frame is rendered
}
}
This is my code. If anyone has any suggestions they would be much appreciated!

Answer 1

In touchDown, set a flag to indicate a touch has started.
In touchUp, clear/remove the flag.
Whilst the flag is set, keep performing your movement code.