Get "does not implement methodSignatureForSelector" when try to store Array in NSUserDefaults,Swift?

Question

I try to store Array of objects in NSUserDefaults.

I have following snippets of code:

    var accounts = MyAccounts()     var array:Array<MyAccounts.MyCalendar> =  accounts.populateFromCalendars()      NSUserDefaults.standardUserDefaults().           setObject(array, forKey: "test_storeAccounts_array") // <- get error here     NSUserDefaults.standardUserDefaults().synchronize() 

But I get Exception:

does not implement methodSignatureForSelector: -- trouble ahead 

---

my class structure:

class MyAccounts {     /* ... */      class MyCalendar {         var title:String?         var identifier:String?         var email:String?         var calType:String?         var isActive:Bool?         var isMainAcount:Bool?          init(){}     } } 

Any ideas?

Answer 1

Make sure your class inherits from NSObject

class MyAccounts:NSObject {     /* ... */      class MyCalendar {         var title:String?         var identifier:String?         var email:String?         var calType:String?         var isActive:Bool?         var isMainAcount:Bool?          init(){}     } } 

Answer 2

I was getting this exception in Swift 3.0. In my case, my model class was not inherit from NSObject base class. just inherit my class from NSObject base class and implements NSCoding protocol (if your container array has custom objects)

  class Stock: NSObject, NSCoding {        var stockName: String?        override init() {       }        //MARK: NSCoding protocol methods       func encode(with aCoder: NSCoder){           aCoder.encode(self.stockName, forKey: "name")       }        required init(coder decoder: NSCoder) {            if let name = decoder.decodeObject(forKey: "name") as? String{                self.stockName = name           }       }        func getStockDataFromDict(stockDict stockDict:[String:AnyObject]) -> Stock {             if let  stockName = stockDict["name"] {                 self.stockName = stockName as? String            }             return self        }    }