nscoding

I have this in Playground using Swift 3, Xcode 8.0: import Foundation class Person: NSObject, NSCoding { var name: String var age: Int init(name: String, age: Int) { self.name = name self.age = age } required convenience init(coder aDecoder: NSCoder) { let name = aDecoder.decodeObject(forKey: "name") as! String let age = aDecoder.decodeObject(forKey: "age") as! Int self.init( name: name, age: age ) } func encode(with aCoder: NSCoder) { aCoder.encode(name, forKey: "name") aCoder.encode(age, forKey: "age") } } create array of Person let newPerson = Person(name: "Joe", age: 10) var people =

I'd like to save an NSMutableDictionary object in NSUserDefaults . The key type in NSMutableDictionary is NSString , the value type is NSArray , which contains a list of object which implements NSCoding . Per document, NSString and NSArray both are conform to NSCoding . I am getting this error: [NSUserDefaults setObject: forKey:]: Attempt to insert non-property value.... of class NSCFDictionary. BlueDolphin I found out one alternative, before save, I encode the root object ( NSArray object) using NSKeyedArchiver , which ends with NSData . Then use UserDefaults save the NSData . When I need the