Swift error: 'NSInvalidArgumentException', reason: '-[_SwiftValue encodeWithCoder:]: unrecognized selector sent to instance 0x60000012abe0'

Question

I have this error. I know some people have answered this on other threads but the answers given did not seem to work for me.

Here is my code:

The People class:

class People: NSObject, NSCoding {

    var firstName : String
    var lastName : String
    var events : [Event]
    init(firstName: String, lastName: String) {

        self.firstName = firstName
        self.lastName = lastName
        self.events = []
    }

    required init (coder aDecoder: NSCoder) {
         firstName = aDecoder.decodeObject(forKey: "firstName") as! String
        lastName = aDecoder.decodeObject(forKey: "lastName") as! String
        events = aDecoder.decodeObject (forKey: "events") as! [Event]


    }

    func encode(with aCoder: NSCoder) {
        aCoder.encode(firstName, forKey: "firstName")
        aCoder.encode(lastName, forKey: "lastName")        
        aCoder.encode(events, forKey: "events")
    }

}

Here is where I call to save the file:

func SaveMyPeople(){
    let Defaults = UserDefaults.standard
    let SavedData = NSKeyedArchiver.archivedData(withRootObject: ArrayPeople)
    Defaults.set(SavedData, forKey: "People") 
}

This is the Event Struct:

struct Event{
    var date : String
    var message : String
}

Any help I can get will be very much appreciated

This isn't the issue, but you're missing super.init(coder: aDecoder) in required init?(coder aDecoder: NSCoder) and also missing the ? in the signature of that init. — JaredH
– JaredH, Commented Mar 25, 2018 at 23:36

JaredH · Accepted Answer · 2018-03-25 23:45:14Z

3

NSCoding requires the NSObjectProtocol. Only Classes can conform to NSObjectProtocol and you're using a Struct. ie:

struct Event{
    var date : String
    var message : String
}

Soroush Khanlou wrote a nice post about this here

edited Mar 25, 2018 at 23:45

answered Mar 25, 2018 at 23:39

JaredH

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