Got Unrecognized selector -replacementObjectForKeyedArchiver: crash when implementing NSCoding in Swift

Question

I created a Swift class that conforms to NSCoding. (Xcode 6 GM, Swift 1.0)

import Foundation

private var nextNonce = 1000

class Command: NSCoding {

    le         


        

Answer 1

Although Swift class works without inheritance, but in order to use NSCoding you must inherit from NSObject.

class Command: NSObject, NSCoding {
    ...
}

Too bad the compiler error is not very informative :(