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

swift version of @Nicolas Manzini answer:

if let psc = self.managedObjectContext?.persistentStoreCoordinator{

        if let store = psc.persistentStores.last as? NSPersistentStore{

            let storeUrl = psc.URLForPersistentStore(store)

            self.managedObjectContext?.performBlockAndWait(){

                self.managedObjectContext?.reset()

                var error:NSError?
                if psc.removePersistentStore(store, error: &error){
                    NSFileManager.defaultManager().removeItemAtURL(storeUrl, error: &error)
                    psc.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: storeUrl, options: nil, error: &error)
                }
            }
        }
    }

Answer 2

import Foundation
import CoreData

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

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

        performAndWait { () -> Void in
            self.reset()
             do
            {
                try self.persistentStoreCoordinator?.remove(persistentStore)
                try FileManager.default.removeItem(at: url)
                try self.persistentStoreCoordinator?.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: url, options: nil)
             }
            catch { /*dealing with errors up to the usage*/ }
         }
    }
}

Thanks @Julian Krol - updated answer for Swift 5.1