Moving Sprites Across Screen In Sprite Kit - swift

Question

I am trying to move a sprite that is a red ball from left and right to the screen. I hear I can do this by using the velocity property maybe or another way would be ok too but here is my code.
import SpriteKit
class GameScene: SKScene, SKPhysicsContactDelegate {
let redBall = SKSpriteNode(imageNamed: "redball")
override func didMoveToView(view: SKView) {
let thrust = CGFloat(0.12)
let thrustDirection = Float()
//RedBall Properties
redBall.physicsBody = SKPhysicsBody(circleOfRadius: redBall.size.width/2)
redBall.physicsBody?.velocity
addChild(redBall)
//World Phyisics Properties
let worldBorder = SKPhysicsBody(edgeLoopFromRect: self.frame)
self.physicsBody?.friction = 1
self.physicsBody = worldBorder
self.physicsWorld.gravity = CGVectorMake(0, 0)
}
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
}
override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) {
}
}
Thanks!

Answer 1

You may want to use an SKAction assuming you want it to slide across the screen as opposed to simply moving from point a to point b. You could do something like this:
let move = SKAction.moveToX(self.frame.size.width, duration: 1.0)
redBall.runAction(move)
This creates an SKAction called move that moves a node to the right side of the screen and then runs that action on a node, in this case the redBall.
To move to the left, you just change the x value in the move action to this:
let move = SKAction.moveToX(0, duration: 1.0)