How do I delete all objects from my persistent store in Core Data?

Question

I have Core Data working in my app. So, I fetch an XML file, parse the data into model objects and insert them into core data. They are saved in the persistent store and I

Answer 1

Based on @Nicolas Manzini answer I have wrote a Swift 2.1 version with little improvements. I have added an extension to NSManagedObjectContext. Full code below:

import Foundation
import CoreData

extension NSManagedObjectContext
{
    func deleteAllData()
    {
        guard let persistentStore = persistentStoreCoordinator?.persistentStores.last else {
            return
        }

        guard let url = persistentStoreCoordinator?.URLForPersistentStore(persistentStore) else {
            return
        }

        performBlockAndWait { () -> Void in
            self.reset()
            do
            {
                try self.persistentStoreCoordinator?.removePersistentStore(persistentStore)
                try NSFileManager.defaultManager().removeItemAtURL(url)
                try self.persistentStoreCoordinator?.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil)
            }
            catch { /*dealing with errors up to the usage*/ }
        }
    }
}