How can I get the position of a moving SKSpriteNode? - ios

Question

I have an SKSpriteNode that moves back and forth.
I need to get it's position as it moves (so it changes all the time) and get different positions as it moves across the screen.
When I try and receive the position it comes as the original position.
Object movement:
let right = SKAction.moveBy(x: self.frame.width, y: 0, duration: 3)
let left = SKAction.moveBy(x: -self.frame.width, y: 0, duration: 3)
And this is what I'm trying to do to get it's position printed as it goes.
override func update(_ currentTime: TimeInterval) {
// Called before each frame is rendered
pos = String(describing: blockposition.x)
print(pos)
}
Is it possible to get one that updates as it moves?

Answer 1

in your "class"
1_ type var sprite(the name of your sprite) = SKSpriteNode()
2_ then add your synod to the scene
3_ then in the update func call print(sprite(the name of your sprite).position.x or y) as you want hope it worked for you

Answer 2

You can't do it this way.
From https://developer.apple.com/documentation/spritekit/skaction?changes=_1
Observing Changes to Node Properties
Generally, actions do not call public methods on nodes. For example, if you wanted to subclass SKNode to respond to a move(to:duration:) action, you may consider overriding its position property to add a didSet observer (see Overriding Property Observers).
class MovingNode: SKSpriteNode {
override var position: CGPoint {
didSet {
// code to react to position change
}
}
}
However, because a move action running on an instance of MovingNode doesn't set its position, the observer isn't invoked and your code to react to a position change is never executed.
In this example, the solution is to use SKSceneDelegate. By comparing a node's position in the delegate's update(_:for:) method - which is called at the beginning of each frame - to its position in the delegate's didEvaluateActions(for:) method - which is called after any actions have been evaluated - you can check if it has moved and react accordingly.
Listing 7 shows an example of how you can implement this solution.
Listing 7
Responding to a position change during a running action
let node = SKNode()
var nodePosition = CGPoint()
func update(_ currentTime: TimeInterval, for scene: SKScene) {
nodePosition = node.position
}
func didEvaluateActions(for scene: SKScene) {
let distance = hypot(node.position.x - nodePosition.x,
node.position.y - nodePosition.y)
if distance > 0 {
// code to react to position change
}
}