Encode Swift object in Objective-c project

Question

I have a swift class integrated in my objective-c project and it returns me an object that I can access and use. I've tried (in an obj-c file) to create a property with this object and encode/decode it using standard methods

- (void)encodeWithCoder:(NSCoder *)encoder

and

- (id)initWithCoder:(NSCoder *)decoder

But my application crashes for "unrecognized selector sent to instance XXX".

I guess I can't serialize swift objects in this direct way, and I don't know how to solve right now. Thank you for your help

Please you can write your class (more code) to be detected the error? — Diego
– Diego, Commented Mar 29, 2016 at 9:52
I don't know what code to post, I try to serialize the swift object as usual.. [encoder encodeObject:self.OBAds forKey:@"OBAds"]; — user3801885
– user3801885, Commented Mar 29, 2016 at 10:13
It seems to me that the OBAds object doesn't implement NSCoder — Dzamir
– Dzamir, Commented Mar 29, 2016 at 10:37

Maury Markowitz · Accepted Answer · 2016-03-29 11:13:07Z

1

In order for this to work you will have to:

a) write the set of encodeWithCoder methods in your Swift class

-or-

b) inherit from an Obj-C class that does

(b) caused me confusion until the simple truth became clear: Swift objects do not descend from NSObject, so a lot of the machinery you expect simply isn't there, and that includes the entire coder system. Quite a bit of functionality becomes available when you change:

class myClass {

to

class myClass: NSObject {

edited Mar 29, 2016 at 11:13

answered Mar 29, 2016 at 10:59

Maury Markowitz

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Comments

Diego · Accepted Answer · 2016-03-29 12:00:02Z

This is a simple class swift. You may take this as an example. I hope we can be of your help.

    class UserBean:NSObject,NSCoding {

    var idUser:NSNumber?
    var username:String?
    var password:String?
    var email:String?
    var token:String?
    var fonte:String?
    var idFacebook:String?
    var uuid:String?
    var profilo = UserProfileBean()

    override init() {
        super.init()
        self.profilo = UserProfileBean()
    }

    required init?(coder aDecoder: NSCoder) {
        idUser      = aDecoder.decodeObjectForKey("idUser") as? NSNumber
        username    = aDecoder.decodeObjectForKey("username") as? String
        password    = aDecoder.decodeObjectForKey("password") as? String
        email       = aDecoder.decodeObjectForKey("email") as? String
        token       = aDecoder.decodeObjectForKey("token") as? String
        fonte       = aDecoder.decodeObjectForKey("fonte") as? String
        idFacebook  = aDecoder.decodeObjectForKey("idFacebook") as? String
        uuid        = (aDecoder.decodeObjectForKey("uuid") as? String)!
        profilo     = (aDecoder.decodeObjectForKey("profilo") as? UserProfileBean)!

    }
    func encodeWithCoder(aCoder: NSCoder) {
        aCoder.encodeObject(idUser,     forKey: "idUser")
        aCoder.encodeObject(username,   forKey: "username")
        aCoder.encodeObject(password,   forKey: "password")
        aCoder.encodeObject(email,      forKey: "email")
        aCoder.encodeObject(token,      forKey: "token")
        aCoder.encodeObject(fonte,      forKey: "fonte")
        aCoder.encodeObject(idFacebook ,forKey: "idFacebook")
        aCoder.encodeObject(uuid ,forKey: "idFacebook")
        aCoder.encodeObject(profilo,forKey: "profilo")

    }  
  }

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