Create Button in SpriteKit: Swift

Question

I want to create a button in SpriteKit or in an SKScene that sends the view to another view controller.

I tried using the "performSegue with identifier ", however apparently an SKScene doesn't support this. How would I create a button that sends the view to another view with SpriteKit?

This is the code that I've tried using to perform this action.

The line with "HomeButton.prepareForSegueWithIdentifier()" is just an example. It won't actually let me add the "prepareForSegue" part, it doesn't support it <--- What I mean by that is when I go to add it, it is unrecognized.

class GameOverScene: SKScene {

     var HomeButton: SKNode! = nil


    init(size: CGSize, won: Bool) {
        super.init(size: size)

        backgroundColor = SKColor.whiteColor()

        HomeButton = SKSpriteNode(color: SKColor.blueColor(), size: CGSize(width: 100, height: 100))
        HomeButton.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
        HomeButton.userInteractionEnabled = true
        self.addChild(HomeButton)

        let message = won ? "You Won!" : "You Lose!"





        let label = SKLabelNode(fontNamed: "Title 1")
        label.text = message
        label.fontSize = 40
        label.fontColor = SKColor.blackColor()
        label.position = CGPoint(x: size.width/2, y: size.height/2)
        addChild(label)

        runAction(SKAction.sequence([SKAction.waitForDuration(3.0), SKAction.runBlock() {
            let reveal = SKTransition.flipHorizontalWithDuration(0.5)
            let scene = GameScene(size: size)
            self.view?.presentScene(scene, transition: reveal)
        }
        ]))


    }

    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
        for touch: AnyObject in touches {
            let location = touch.locationInNode(self)

            if HomeButton.containsPoint(location) {

                HomeButton.prepareForSegueWithIdentifier()

            }
        }
    }

Note: I've tried using a button, but they don't work in and SKScene.

I'll be on to respond if there is any confusion.

Answer 1

I have translated Alessandro Ornano’s answer to Swift 3.1:

import SpriteKit

class FTButtonNode: SKSpriteNode {

enum FTButtonActionType: Int {
    case TouchUpInside = 1,
    TouchDown, TouchUp
}

var isEnabled: Bool = true {
    didSet {
        if (disabledTexture != nil) {
            texture = isEnabled ? defaultTexture : disabledTexture
        }
    }
}
var isSelected: Bool = false {
    didSet {
        texture = isSelected ? selectedTexture : defaultTexture
    }
}

var defaultTexture: SKTexture
var selectedTexture: SKTexture
var label: SKLabelNode

required init(coder: NSCoder) {
    fatalError("NSCoding not supported")
}

init(normalTexture defaultTexture: SKTexture!, selectedTexture:SKTexture!, disabledTexture: SKTexture?) {
    
    self.defaultTexture = defaultTexture
    self.selectedTexture = selectedTexture
    self.disabledTexture = disabledTexture
    self.label = SKLabelNode(fontNamed: "Helvetica");
    
    super.init(texture: defaultTexture, color: UIColor.white, size: defaultTexture.size())
    isUserInteractionEnabled = true
    
    //Creating and adding a blank label, centered on the button
    self.label.verticalAlignmentMode = SKLabelVerticalAlignmentMode.center;
    self.label.horizontalAlignmentMode = SKLabelHorizontalAlignmentMode.center;
    addChild(self.label)
    
    // Adding this node as an empty layer. Without it the touch functions are not being called
    // The reason for this is unknown when this was implemented...?
    let bugFixLayerNode = SKSpriteNode(texture: nil, color: UIColor.clear, size: defaultTexture.size())
    bugFixLayerNode.position = self.position
    addChild(bugFixLayerNode)
    
}

/**
 * Taking a target object and adding an action that is triggered by a button event.
 */
func setButtonAction(target: AnyObject, triggerEvent event:FTButtonActionType, action:Selector) {
    
    switch (event) {
    case .TouchUpInside:
        targetTouchUpInside = target
        actionTouchUpInside = action
    case .TouchDown:
        targetTouchDown = target
        actionTouchDown = action
    case .TouchUp:
        targetTouchUp = target
        actionTouchUp = action
    }
    
}

/*
 New function for setting text. Calling function multiple times does
 not create a ton of new labels, just updates existing label.
 You can set the title, font type and font size with this function
 */

func setButtonLabel(title: NSString, font: String, fontSize: CGFloat) {
    self.label.text = title as String
    self.label.fontSize = fontSize
    self.label.fontName = font
}

var disabledTexture: SKTexture?
var actionTouchUpInside: Selector?
var actionTouchUp: Selector?
var actionTouchDown: Selector?
weak var targetTouchUpInside: AnyObject?
weak var targetTouchUp: AnyObject?
weak var targetTouchDown: AnyObject?

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if (!isEnabled) {
        return
    }
    isSelected = true
    if (targetTouchDown != nil && targetTouchDown!.responds(to: actionTouchDown)) {
        UIApplication.shared.sendAction(actionTouchDown!, to: targetTouchDown, from: self, for: nil)
    }
}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    
    if (!isEnabled) {
        return
    }
    
    let touch: AnyObject! = touches.first
    let touchLocation = touch.location(in: parent!)
    
    if (frame.contains(touchLocation)) {
        isSelected = true
    } else {
        isSelected = false
    }
    
}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    if (!isEnabled) {
        return
    }
    
    isSelected = false
    
    if (targetTouchUpInside != nil && targetTouchUpInside!.responds(to: actionTouchUpInside!)) {
        let touch: AnyObject! = touches.first
        let touchLocation = touch.location(in: parent!)
        
        if (frame.contains(touchLocation) ) {
            UIApplication.shared.sendAction(actionTouchUpInside!, to: targetTouchUpInside, from: self, for: nil)
        }
        
    }
    
    if (targetTouchUp != nil && targetTouchUp!.responds(to: actionTouchUp!)) {
        UIApplication.shared.sendAction(actionTouchUp!, to: targetTouchUp, from: self, for: nil)
    }
}

}

Usage:

@objc func buttonTap() {
    print("Button pressed")
}

override func didMove(to view: SKView)
{
    backgroundColor = SKColor.white
    let buttonTexture: SKTexture! = SKTexture(imageNamed: "button")
    let buttonTextureSelected: SKTexture! = SKTexture(imageNamed: "buttonSelected.png")
    let button = FTButtonNode(normalTexture: buttonTexture, selectedTexture: buttonTextureSelected, disabledTexture: buttonTexture)
    button.setButtonAction(target: self, triggerEvent: .TouchUpInside, action: #selector(GameScene.buttonTap))
    button.setButtonLabel(title: "Button", font: "Arial", fontSize: 12)
    button.position = CGPoint(x: self.frame.midX,y: self.frame.midY)
    button.zPosition = 1
    button.name = "Button"
    self.addChild(button)
}

I have created two .png: