You can add gesture recognizer like this:
class GameScene: SKScene {
override func didMoveToView(view: SKView) {
/* Setup your scene here */
let swipeRight:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedRight:"))
swipeRight.direction = .Right
view.addGestureRecognizer(swipeRight)
}
func swipedRight(sender:UISwipeGestureRecognizer){
print("swiped right")
}
}
Do the same for other directions. So, when you spawn a node, you can set a variable which stores current node's type (or color) and based on that, check if user has swiped in right direction.
Hint:
Keep in mind, that you can run into memory problems if you are adding a gesture recognizer each time the scene is loaded. This might happen because recognizers are added to the view instead of the scene, so no matter if scene is deallocated, recognizers will stay alive. Read more here.
EDIT:
This is a workable example which slightly differs from your current implementation, but in general, it does the same thing. You can just copy and paste to see how it works. It should give you an idea in which directions you can go to solve problems like :
- how to track the color of the current node
- how to create a subclass of SKSpriteNode
- how to can remove the node when it end-up offscreen
probably some more (like how to update a label automatically when score is incremented)
enum Color:UInt32 {
case Red // 0 - texture should be Color0@2x.png
case Blue // 1 - texture should be Color1@2x.png
//case Green // 2 - texture should be Color2@2x.png
//case Yellow // 3 - texture should be Color3@2x.png
case NumberOfColors
}
class Circle:SKSpriteNode {
let textureColor:Color
//Initialize a circle with color and size
init(textureColor:Color, size:CGSize){
self.textureColor = textureColor
super.init(texture: SKTexture(imageNamed: "Color\(textureColor.rawValue)"), color:.clearColor(), size: size)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
class GameScene: SKScene {
let label = SKLabelNode(fontNamed: "ArialMT")
var score: Int = 0 {
didSet {
label.text = "Score: \(score)"
}
}
var currentCircle:Circle?
func spawnRandomCircle() {
//Randomize a circle. If you fail to randomize index correctly, default circle will be blue.
let index = arc4random_uniform(Color.NumberOfColors.rawValue)
let circle = Circle(textureColor: Color(rawValue: index) ?? Color.Blue, size: CGSize(width: 50, height: 50))
circle.position = CGPointMake(size.width / 2, 650)
addChild(circle)
//Move circle (and remove it, if end-up offscreen)
let move = SKAction.moveByX(0, y: -1600, duration: NSTimeInterval(8.5))
let moveAndRemove = SKAction.sequence([move, SKAction.removeFromParent()])
circle.runAction(moveAndRemove, withKey: "moving")
//Update currentCircle
currentCircle = circle
}
override func didMoveToView(view: SKView) {
//Setup score label
addChild(label)
label.position = CGPoint(x: frame.minX+50, y: frame.maxY-50) //Put a score label in top left corner
label.horizontalAlignmentMode = SKLabelHorizontalAlignmentMode.Left
label.text = String(score)
//Create gesture recognizers
let swipeUp:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedUp:"))
swipeUp.direction = .Up
view.addGestureRecognizer(swipeUp)
let swipeDown:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedDown:"))
swipeDown.direction = .Down
view.addGestureRecognizer(swipeDown)
//Spawn first circle
spawnRandomCircle()
}
//This method accepts the Color associated with a certian swipe direction
//eg. if Swipe Up is detected, Red color will be passed ...
func validateSwipe(color:Color){
if let circle = currentCircle {
circle.removeFromParent()
if circle.textureColor == color {++score} else {--score}
spawnRandomCircle()
}
}
func swipedUp(sender:UISwipeGestureRecognizer){
validateSwipe(Color.Red) //Red circle - Swipe Up
}
func swipedDown(sender:UISwipeGestureRecognizer){
validateSwipe(Color.Blue) //Blue circle - Swipe Down
}
}
This can be done in many different ways and if you have questions feel free to ask...
