Subclassing SKLabelNode error with Swift

1
votes

I have the following class that is a subclass of SKLabelNode. This class will not work without the 

override init(){
        super.init()
    }

call. It seems that SKLabelNode is trying to call an init() method with no parameters, or something else is going on somewhere that is causing this issue.

Here is the simplified class.

import UIKit
import SpriteKit

class PulsatingText: SKLabelNode {

    override init(){
        super.init()
    }

    init (fontNamed:String!, theText: String!, theFontSize: CGFloat!){
        super.init(fontNamed: fontNamed)
        self.text = theText
        self.fontSize = theFontSize
    }


    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

If i remove the 

override init(){
            super.init()
        }

I get a runtime crash with the following error logged to the console.

fatal error: use of unimplemented initializer 'init()' for class 'MobileTutsInvaderz.PulsatingText'

Here is how I am calling the method.

let invaderText = PulsatingText(fontNamed: "ChalkDuster", theText: "INVADERZ", theFontSize:50)

I am also including a image of the stack trace below.

,

2
swiftsprite-kit
Default initializer for SKLabelNode is init(fontNamed fontName: String!), did you try to override it? - Nikita Ivaniushchenko
Can you show the code that calls this class? - Andy Heard
@AndyHeard I udated the post to show I am calling the class. - james
@NikitaIvaniushchenko I did not try to override it either No, what you see in this class is it. - james

2 Answers

2
votes

You need to initialize the init() method. Because the default init() method gets called everytime you initialize a SKLabelNode. You can test it by implementing the override init() and add an println statement like that:

override init() {
    super.init()
    println("test")
}

If you now init a labelnode like that:

var label:PulsatingText = PulsatingText(fontNamed: "Arial", theText: "hey", theFontSize: 12)

The println("test") will get called.

0
votes

Since you only want to add convenience initializer and leave the rest as is, you don't need to override designated initializers. So just change your code like this:

class PulsatingText: SKLabelNode {

    convenience init (fontNamed:String!, theText: String!, theFontSize: CGFloat!){
        self.init(fontNamed: fontNamed)
        self.text = theText
        self.fontSize = theFontSize
    }
}