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 i

Answer 1

If you need to create a button in SpriteKit, I think this button must have all or some of the available actions to do whatever you want (exactly as UIButton did)

Here you can find a simple class that build a SpriteKit button, called FTButtonNode:

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.whiteColor(), size: defaultTexture.size())
        userInteractionEnabled = 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.clearColor(), 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, withEvent event: UIEvent?) {
        if (!isEnabled) {
            return
        }
        isSelected = true
        if (targetTouchDown != nil && targetTouchDown!.respondsToSelector(actionTouchDown!)) {
            UIApplication.sharedApplication().sendAction(actionTouchDown!, to: targetTouchDown, from: self, forEvent: nil)
        }
    }

    override func touchesMoved(touches: Set, withEvent event: UIEvent?) {

        if (!isEnabled) {
            return
        }

        let touch: AnyObject! = touches.first
        let touchLocation = touch.locationInNode(parent!)

        if (CGRectContainsPoint(frame, touchLocation)) {
            isSelected = true
        } else {
            isSelected = false
        }

    }

    override func touchesEnded(touches: Set, withEvent event: UIEvent?) {
        if (!isEnabled) {
            return
        }

        isSelected = false

        if (targetTouchUpInside != nil && targetTouchUpInside!.respondsToSelector(actionTouchUpInside!)) {
            let touch: AnyObject! = touches.first
            let touchLocation = touch.locationInNode(parent!)

            if (CGRectContainsPoint(frame, touchLocation) ) {
                UIApplication.sharedApplication().sendAction(actionTouchUpInside!, to: targetTouchUpInside, from: self, forEvent: nil)
            }

        }

        if (targetTouchUp != nil && targetTouchUp!.respondsToSelector(actionTouchUp!)) {
            UIApplication.sharedApplication().sendAction(actionTouchUp!, to: targetTouchUp, from: self, forEvent: nil)
        }
    }

}

The source is available in this Gist

Usage:

let backTexture: SKTexture! = SKTexture(image:"backBtn.png")
let backTextureSelected: SKTexture! = SKTexture(image:"backSelBtn.png")  
let backBtn = FTButtonNode(normalTexture: backTexture, selectedTexture: backTextureSelected, disabledTexture: backTexture,size:backTexture.size())
backBtn.setButtonAction(self, triggerEvent: .TouchUpInside, action: #selector(GameScene.backBtnTap))
backBtn.position = CGPointMake(CGRectGetMidX(self.frame),CGRectGetMidY(self.frame))
backBtn.zPosition = 1
backBtn.name = "backBtn"
self.addChild(backBtn)

func backBtnTap() {
    print("backBtnTap tapped")
    // Here for example you can do:
    let transition = SKTransition.fadeWithDuration(0.5)
    let nextScene = MenuScene(size: self.scene!.size)
    nextScene.scaleMode = .ResizeFill
    self.scene?.view?.presentScene(nextScene, transition: transition)
}