ios - Variables from custom subclass aren't saved/won't load from Core Data -

i making drawing application allows users save , reopen drawings, hence why need use coredata. 1 of features ability change path colour. need store colour in each uibezierpath strokes right colour when gets drawn. hence subclassed uibezierpath:

class colorpath: uibezierpath {   var pathstrokecolor: uicolor?  } 

i draw paths in draw(_ rect:) function:

        path in paths{         path.pathstrokecolor?.setstroke()         path.stroke()                } 

this works fine until close application , reopen it. pathstrokecolor has nil value, , draws in default colour -- black.

the array of path arrays saved in core data entity jfile this. "thearray" of type transformable, convert colorpath nsobject:

    let context = (uiapplication.shared.delegate as! appdelegate).persistentcontainer.viewcontext     let afile = jfile(context: context)      afile.thearray = arrayofpages nsobject      (uiapplication.shared.delegate as! appdelegate).savecontext() 

the array of path arrays retrieved this. have convert nsobject array colorpath:

   let context = (uiapplication.shared.delegate as! appdelegate).persistentcontainer.viewcontext                         let jfiles = try context.fetch(jfile.fetchrequest())                         let filez = files as! [jfile]                         if filez.count>0{                            arrayofpages = filez[myindex].thearray as! [[colorpath]]                         } 

so assume subclassing uibezierpath incorrectly because variable work core data 1 made myself -- pathstrokecolor. syntax wrong? pathstrokecolor being optional? because can't class subclass nsobject? how fix this?

you can't save object core-data. must number, date, string or data. if want store other convert data first store , decode data when want read it. based on code shared there not appear anywhere taking place.

when property transformable allows store object conforms nscoding core-data. not magic. objects conform nscoding implement init?(coder adecoder: nscoder) , encode(with acoder: nscoder) convert object , data.

a uibezierpath conforms nscoding, technically subclass well. subclass not storing property. have implement encoding in subclass:

required init?(coder adecoder: nscoder) {     super.init(coder: adecoder)     if let color = adecoder.decodeobject(forkey: "pathstrokecolor") as? uicolor{         pathstrokecolor = color     } } override func encode(with acoder: nscoder) {     super.encode(with: acoder)     if let color = pathstrokecolor{         acoder.encode(color, forkey: "pathstrokecolor")     } }