Saving NSDate error in Swift 3 and iOS 10

问题

I believe this is a bug introduced in the new stack probably Swift 3 / iOS 10. I am running on XCode8 / Swift3 / iPhone 7 (Simulator) / ios 10.0 I have not found any related report of it.

1. set the value

   let dt : Date? = Date()
   UserDefaults.standard.set(dt, forKey: "test-date")
   

2. Get the value

   let dt = UserDefaults.standard.object(forKey: "test-date")
   if dt == nil {
     return false
   }
   else {
     let date = dt! as Date // FAILED
   }
   

The failed message is:

Could not cast value of type '__NSCFData' (0x10fa08500) to 'NSDate' (0x10fa08f00).

Not sure how the object is converted to NSData instead of NSDate.

来源：https://stackoverflow.com/questions/39515942/saving-nsdate-error-in-swift-3-and-ios-10