Wsrtjtyk

I am trying to work with GameplayKit and SpriteKit using the scene editor in Xcode. I am new to SpriteKit and also have not used NSSecureEncoding before. Pretty new at swift to be honest.

I have a basic GKComponent subclass with one integer one string property implemented like this.

import Foundation

import GameplayKit



@objc

class BasicComponent: GKComponent {



    @GKInspectable var number: Int = 0

    @GKInspectable var text: String = " "



    struct CoderKeys {

        static let stringKey = "StringKey"

        static let integerKey = "IntegerKey"

    }



    override static var supportsSecureCoding: Bool  {

        return true

    }



    required convenience init?(coder aDecoder: NSCoder) {

        self.init(coder: aDecoder)

        if let num = aDecoder.decodeObject(of: NSNumber.self, forKey: CoderKeys.integerKey) { self.number = num.intValue }

        if let tex = aDecoder.decodeObject(of: NSString.self, forKey: CoderKeys.stringKey) { self.text = tex as String }

    }



    override func encode(with aCoder: NSCoder) {

        super.encode(with: aCoder)

        aCoder.encode(self.number as NSNumber, forKey: CoderKeys.integerKey)

        aCoder.encode(self.text as NSString, forKey: CoderKeys.stringKey)

    }





}

Every time I add this component to a node, Xcode crashes silently when the scene is saved (autosave or on purpose). The backtrace in the Xcode crash log file shows an NSInvalidArgumentException:

UNCAUGHT EXCEPTION (NSInvalidArgumentException): *** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[3]

UserInfo: (null)

Hints:



Backtrace:

0   __exceptionPreprocess (in CoreFoundation)

1   DVTFailureHintExceptionPreprocessor (in DVTFoundation)

2   objc_exception_throw (in libobjc.A.dylib)

3   -[CFPrefsConfigurationFileSource initWithConfigurationPropertyList:containingPreferences:] (in CoreFoundation)

4   -[__NSPlaceholderArray initWithObjects:count:] (in CoreFoundation)

5   +[NSArray arrayWithObjects:count:] (in CoreFoundation)

6   -[GTFSceneCustomComponentProperty initWithCoder:] (in GameToolsFoundation)

7   _decodeObjectBinary (in Foundation)

8   -[NSKeyedUnarchiver _decodeArrayOfObjectsForKey:] (in Foundation)

9   -[NSDictionary(NSDictionary) initWithCoder:] (in Foundation)

10   _decodeObjectBinary (in Foundation)

11   _decodeObject (in Foundation)

12   -[NSKeyedUnarchiver decodeObjectForKey:] (in Foundation)

13   -[NSKeyedUnarchiver decodeObjectOfClasses:forKey:] (in Foundation)

14   -[GTFSceneCustomComponent initWithCoder:] (in GameToolsFoundation)

15   _decodeObjectBinary (in Foundation)

16   -[NSKeyedUnarchiver _decodeArrayOfObjectsForKey:] (in Foundation)

17   -[NSArray(NSArray) initWithCoder:] (in Foundation)

18   _decodeObjectBinary (in Foundation)

19   _decodeObject (in Foundation)

20   -[NSKeyedUnarchiver decodeObjectForKey:] (in Foundation)

Also new at reading backtraces but it seems to me that the init?(coder:) fails and returns a null object, which is causing the error.

Furthermore, if i remove the String property, this works flawlessly. I don't know what is causing the init? to fail...

Anyway I could be way off base but I'm quite sure I am missing something simple and will look stupid, but I just can't figure it out.

Thanks for any help.