CODEWITHSUNDEEP
swiftnsuserdefaultsuserdefaults
Candis Mayer
Candis Mayer

Reputation: 33

Save Dictionary of custom objects in Swift using UserDefaults

I'm writing an app to work with contacts and trying to save information with UserDefaults but I'm getting SIGABRT. Here's my code, what I'm doing wrong?

class Contact{
var name = String()
var phone = String()

init(name: String, phone: String){
    self.name=name
    self.phone=phone
}
required init(coder decoder: NSCoder){
    self.name = (decoder.decodeObject(forKey: "name") as? String)!
    self.phone = (decoder.decodeObject(forKey: "phone") as? String)!
}
func encode(with coder: NSCoder){
    coder.encode(name, forKey: "name")
    coder.encode(phone, forKey: "phone")
}
}

Creating contact in ViewDidLoad just for test:

        let userDefaults = UserDefaults.standard
var contactDictionary = Dictionary<String, [Contact]>()

  override func viewDidLoad() {
    super.viewDidLoad()
    contactDictionary["A"] = [Contact(name: "Annabel",phone: "000")]

    let encodedData = NSKeyedArchiver.archivedData(withRootObject: contactDictionary)
    userDefaults.set(encodedData, forKey: "contactDictionary")
    userDefaults.synchronize()
    if let data = userDefaults.data(forKey: "contactDictionary"){
        print("yep")
        contactDictionary = (NSKeyedUnarchiver.unarchiveObject(with: data) as? [String : [Contact]])!
    }
    else{
        print("nope")
    }
}

Upvotes: 3

Views: 1053

Answers (1)

Leo Dabus
Leo Dabus

Reputation: 236360

You need to make your class NSCoding compliant and inherit from NSObject. Change your Contact declaration to class Contact: NSObject, NSCoding {. And Btw conditionally cast to force unwrap it later is pointless. decoder.decodeObject(forKey: "name") as! String

class Contact: NSObject, NSCoding {
    var name = String()
    var phone = String()
    init(name: String, phone: String){
        self.name=name
        self.phone=phone
    }
    required init(coder decoder: NSCoder){
        self.name = decoder.decodeObject(forKey: "name") as! String
        self.phone = decoder.decodeObject(forKey: "phone") as! String
    }
    func encode(with coder: NSCoder){
        coder.encode(name, forKey: "name")
        coder.encode(phone, forKey: "phone")
    }
}

Testing:

let contactDictionary = ["A":[Contact(name: "Annabel",phone: "000")]]

let encodedData = NSKeyedArchiver.archivedData(withRootObject: contactDictionary)
UserDefaults.standard.set(encodedData, forKey: "contactDictionary")

if let data = UserDefaults.standard.data(forKey: "contactDictionary") {
    print("yep")
    let contactDictionary2 = NSKeyedUnarchiver.unarchiveObject(with: data) as! [String : [Contact]]
}
else{
    print("nope")
}

Upvotes: 2

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