NSCoding Archiving with Playground

NSCodingPlayground.swift

let docsDir = FileManager().urls(for: .documentDirectory, in: .userDomainMask).first!
print(docsDir)

let archiveURL = docsDir.appendingPathComponent("landmark")
print(archiveURL.path)

class LandmarkClass : NSObject, NSCoding {
   var name = ""
   init(name: String) {
       self.name = name
   }
   func encode(with aCoder: NSCoder) {
       aCoder.encode(name, forKey: "name")
   }
   required convenience init?(coder aDecoder: NSCoder) {
       if let name = aDecoder.decodeObject(forKey: "name") as? String {
           self.init(name: name)
       } else {
           return nil
       }
   }
}

let myLandmarkClass = LandmarkClass(name: "World Trade Center")

NSKeyedArchiver.archiveRootObject(myLandmarkClass, toFile: archiveURL.path)

if let me = NSKeyedUnarchiver.unarchiveObject(withFile: archiveURL.path) as? LandmarkClass {
   print(me.name)
}