How create movement buttons left/right? - swift

Question

Please help. I am a beginner on Swift. I've added sprites for player and left/right buttons. But how can I add an action for every button and apply these actions to the player?
import SpriteKit
class GameScene: SKScene, SKPhysicsContactDelegate {
var player: SKSpriteNode!
var leftMove: SKSpriteNode!
var rightMove: SKSpriteNode!
override func didMoveToView(view: SKView) {
player = SKSpriteNode (imageNamed: "player")
player.position = CGPoint(x:127, y:125)
addChild(player)
leftMove = SKSpriteNode (imageNamed: "leftMove")
leftMove.position = CGPoint(x:80, y:35)
leftMove.size = CGSize (width: 55, height: 55)
addChild(leftMove)
rightMove = SKSpriteNode (imageNamed: "rightMove")
rightMove.position = CGPoint(x:160, y:35)
rightMove.size = CGSize (width: 55, height: 55)
addChild(rightMove)
physicsWorld.contactDelegate = self
}

Answer 1

Give the buttons a unique name like:
leftMove.name = "Left"
rightMove.name = "Right"
Implement the logic in touchesBegan:
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
/* Called when a touch begins */
for touch: AnyObject in touches {
let location = touch.locationInNode(self)
let node = self.nodeAtPoint(location)
if (node.name == "Left") {
// Implement your logic for left button touch here:
player.position = CGPoint(x:player.position.x-1, y:player.position.y)
} else if (node.name == "Right") {
// Implement your logic for right button touch here:
player.position = CGPoint(x:player.position.x+1, y:player.position.y)
}
}
}

Answer 2

Welcome to StackOverflow. My recommendation is that for each button that you would like to have actions on, that you subclass SKSpriteNode for those objects. This way you can leverage the touchesBegan:, touchesMoved: and touchesEnded: functions for each of these objects individually. For example:
As promised, here is a more robust version of a subclassed SKSpriteNode. Also, I tested it in one of my projects and I can attest to it working correctly:
import Foundation
import SpriteKit
class SubclassedSKSpriteNode: SKSpriteNode {
init() {
let texture = SKTexture(imageNamed: "whateverImage.png")
super.init(texture: texture, color: UIColor.clearColor(), size: texture.size())
userInteractionEnabled = true
}
required init(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
let location = (touches.first! ).locationInNode(scene!)
position = scene!.convertPoint(location, toNode: parent!)
print("touchesBegan: \(location)")
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
let location = (touches.first! ).locationInNode(scene!)
position = scene!.convertPoint(location, toNode: parent!)
print("touchesMoved: \(location)")
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
let location = (touches.first! ).locationInNode(scene!)
position = scene!.convertPoint(location, toNode: parent!)
print("touchesEnded: \(location)")
}
}
Also, to add this button to your SKScene (or any other SKNode):
let button = SubclassedSKSpriteNode()
button.position = CGPointMake(420, 300)
addChild(button)
HTH!