Swift SpriteKit Gravity Point - ios

Question

I need to make something like a Gravity Point in Swift.
The SpriteNode is in the middle of the screen, and by Left or Right Gestures it can move along the x-axis.
But after for e.g. a 'RightSwipe', it should come back to his starting point. You could say it should look like a jump along the x-axis.
The World Gravity cant be a specific point, so how can I 'Force' it to come back to his original point?
I tried it with SKFieldNode's RadialGravityField, but after the Nodes impulse is made, it goes back to his original point and disappears.
How can I avoid that?
My Code:
{
.......
Node = SKSpriteNode(texture: Node1)
Node.size = CGSize(width: 100, height: 140)
Node.position = CGPoint(x: self.frame.size.width / 2, y: self.frame.size.height / 4)
Node.zPosition = 3
Node.runAction(RunAnimation)
Node.physicsBody = SKPhysicsBody(rectangleOfSize: Node.size)
Node.physicsBody?.dynamic = true
Node.physicsBody?.allowsRotation = false
Node.physicsBody?.usesPreciseCollisionDetection = true
Node.physicsBody?.restitution = 0
Node.physicsBody?.velocity = CGVectorMake(0, 0)
self.addChild(Node)
let swipeRight:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("SwipeRight:"))
swipeRight.direction = .Right
view.addGestureRecognizer(swipeRight)
let swipeLeft:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("SwipeLeft:"))
swipeLeft.direction = .Left
view.addGestureRecognizer(swipeLeft)
}
func SwipeRight(recognizer:UISwipeGestureRecognizer) {
Node.physicsBody?.applyImpulse(CGVectorMake(10,0))
}
func SwipeLeft(recognizer:UISwipeGestureRecognizer) {
Node.physicsBody?.applyImpulse(CGVectorMake(-10,0))
}
override func update(currentTime: CFTimeInterval) {
if(Node.position.x > self.frame.size.width / 1.6)
{
fieldNode = SKFieldNode.radialGravityField()
fieldNode.enabled = true
fieldNode.position = CGPoint(x: self.frame.size.width / 2, y: self.frame.size.height / 4)
fieldNode.strength = 0.4
addChild(fieldNode)
}
if(Node.position.x < self.frame.size.width / 2.6)
{
fieldNode = SKFieldNode.radialGravityField()
fieldNode.enabled = true
fieldNode.position = CGPoint(x: self.frame.size.width / 2, y: self.frame.size.height / 4)
fieldNode.strength = 0.4
addChild(fieldNode)
}

Answer 1

Sounds like a job for a radial gravity SKFieldNode. link