Swift: Cannot convert value of type 'Int16' to expected argument type 'AnyObject?' [duplicate]

问题:

This question already has an answer here:

• Cannot invoke setValue with an argument list of type (Int64, String) 1 answer

I get the following error:

Cannot convert value of type 'Int16' to expected argument type 'AnyObject?'

on the line

person.setValue(Time, forKey: "Time") 

when I run this app. The frame of the function was taken from this tutorial and changed from String to Int16, as well as the entity and attribute names.

var people = [NSManagedObject]()     func saveName(Time: Int16) {     //1     let appDelegate =         UIApplication.sharedApplication().delegate as! AppDelegate      let managedContext = appDelegate.managedObjectContext      //2     let entity =  NSEntityDescription.entityForName("Person",                                                     inManagedObjectContext:managedContext)      let person = NSManagedObject(entity: entity!,                                  insertIntoManagedObjectContext: managedContext)      //3     person.setValue(Time, forKey: "Time")      //4     do {         try managedContext.save()         //5         people.append(person)     } catch let error as NSError  {         print("Could not save \(error), \(error.userInfo)")     } } 

回答1:

As the error says, Int16 isn't an object in Swift, and therefore can't be used in setValue(forKey:), which expects an object. Try wrapping it in an NSNumber, like so:

person.setValue(NSNumber(short: Time), forKey: "Time") 

回答2:

If you are going to use an Int16, you cannot hand that off directly to Objective-C as an object the way you can with bridged number types like Int. Swift numbers are not Objective-C objects, and Swift is not going to help you except with simple numbers like Int and Double. For an Int16, you must wrap it up as an NSNumber, yourself.

文章来源: Swift: Cannot convert value of type 'Int16' to expected argument type 'AnyObject?' [duplicate]