Moving multiple nodes at once from touch with SpriteKit - sprite-kit

Question

I have a game that has 3 SKSpriteNodes that the user can move around using the touchesBegan and touchesMoved. However, when the users moves nodeA and passes another node called nodeB, nodeB follows nodeA and so on.
I created an array of SKSpriteNodes and used a for-loop to make life easier.
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let nodes = [nodeA, nodeB, nodeC]
for touch in touches {
let location = touch.location(in: self)
for node in nodes {
if node!.contains(location) {
node!.position = location
}
}
}
}
Everything is working except when nodeA is moving and cross paths with nodeB, nodeB follows nodeA.
How can I make it so that when the user is moving nodeA and nodeA passes through nodeB that nodeB would not follow nodeA.

Answer 1

Instead of doing slow searches, have a special node variable for your touched node
class GameScene
{
var touchedNodeHolder : SKNode?
override func touchesBegan(.....)
{
for touch in touches {
guard touchNodeHandler != nil else {return} //let's not allow other touches to interfere
let pointOfTouch = touch.location(in: self)
touchedNodeHolder = nodeAtPoint(pointOfTouch)
}
}
override func touchesMoved(.....)
{
for touch in touches {
let pointOfTouch = touch.location(in: self)
touchedNodeHolder?.position = pointOfTouch
}
}
override func touchesEnded(.....)
{
for touch in touches {
touchedNodeHolder = nil
}
}
}

Answer 2

After some experimenting, I found a way to go about this problem.
Instead of selecting the node by the position of the touch, I found that selecting the node by its name property did the trick.
The code shown is implemented inside the touchesMoved and touchesBegan methods
//name of the nodes
let nodeNames = ["playO", "playOO", "playOOO", "playX", "playXX", "playXXX"]
//the actual nodes
let player = [playerO, playerOO, playerOOO, playerX, playerXX, playerXXX]
for touch in touches {
let pointOfTouch = touch.location(in: self)
let tappedNode = atPoint(pointOfTouch)
let nameOfTappedNode = tappedNode.name
for i in 0..<nodeNames.count {
if nameOfTappedNode == nodeNames[i] {
z += 1
player[i]!.zPosition = CGFloat(z)
print(player[i]!.zPosition)
player[i]!.position = pointOfTouch
}
}
}