Get node last position - swift

Question

It's the third time I'm looking for help in this question.
I have a class name BallNode of kind SKShapeNode. Inside my code I also have a function the spawn ball every 3 second from the top side of the screen. Now, I want to set a function that locate the ball position every 1 second, and so, if the ball.position.y > 200 to print a message to the console.
The purpose of this is that if any ball will be at this position (not while it's falling down) the I will call another function. I tried to do it via SKAction, update(_ currentTime: CFTimeInterval), Timer but I didn't succeed and I really have no idea what to do...
update - my current code:
var timeType1: CFTimeInterval = 0.0
var timeType2: CFTimeInterval = 2.0
override func update(_ currentTime: CFTimeInterval) {
if (currentTime - timeType1 > timeType2){
print("time")
self.checkBallsPosition()
self.timeType1 = currentTime
}
self.enumerateChildNodes(withName: "color.BallNode") { node, _ in
self.checkBallsPosition()
}
}
func checkBallsPosition() {
self.enumerateChildNodes(withName: "BALL") { (node: SKNode, nil) in
let x = self.createTopBorder()
x.isHidden = true
let wait2 = SKAction.wait(forDuration: 1)
let action2 = SKAction.run {
let position = Double(node.position.y)
if position < 200 {
}
else if position > 200 {
print("bolbo")
node.removeFromParent()
}
}
self.run(SKAction.sequence([wait2,action2]))
}
}
thats what I try do to so far, as I said the problem is that I want to get the ball last position. because the ball fall down the screen the last position should be when it touch the bottom border of the screen or when it touches another ball. if I set it at update I get the ball position every frame or (as I did) every second - but not the last. another problem is that the ball position can always change depends on another balls (when collision occurs).
update #2 - another functions:
func spawnBalls() {
let wait = SKAction.wait(forDuration: 3)
let action = SKAction.run {
self.createBall()
}
run(SKAction.repeatForever((SKAction.sequence([wait, action]))))
}
func createBall(){
let ball = BallNode(radius: 65)
print(ball.Name)
print(ball._subName!)
ball.position.y = ((frame.size.height) - 200)
let ballXPosition = arc4random_uniform(UInt32(frame.size.width))
ball.position.x = CGFloat(ballXPosition)
ball.physicsBody?.categoryBitMask = PhysicsCategory.ball
ball.physicsBody?.collisionBitMask = PhysicsCategory.ball
ball.physicsBody?.contactTestBitMask = PhysicsCategory.topBorder
ball.delegate = self
addChild(ball)
}

Answer 1

You did not post the entire code you are using. Not knowing how you are spawning your balls, how is the hierarchy and how you are moving them, I can't reproduce it here.
I am not sure if I understand it right, but I believe it might be simpler than what you are doing. See if the code below helps you, I am making the balls fall with SKAction (you can do it with physics also), and checking when they go below zero, when I remove them.
private let ballSpeed : CGFloat = 400
private let ballRadius : CGFloat = 10
private func spawnBall(atPoint pos : CGPoint){
let b = SKShapeNode(circleOfRadius: ballRadius)
b.name = "ball"
b.position = pos
addChild(b)
b.run(SKAction.moveTo(y: -size.height, duration: TimeInterval((pos.y+size.height)/400)))
}
override func update(_ currentTime: TimeInterval) {
super.update(currentTime)
enumerateChildNodes(withName: "ball") { (node, _) in
if node.position.y < 0 {
node.removeFromParent()
}
}
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches{
let pos = touch.location(in: self)
spawnBall(atPoint: pos)
}
}