NSManagedDocument App Delegate

gistfile1.swift

let fileManager = NSFileManager.defaultManager()
let directoryArray = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
let directoryUrl = directoryArray[0] as! NSURL
let documentName = "data-store"
let url:NSURL = directoryUrl.URLByAppendingPathComponent(documentName)
var document = UIManagedDocument(fileURL: url)

let fileExists = fileManager.fileExistsAtPath(url.path!)

if fileExists {
    
    document.openWithCompletionHandler { (success) -> Void in
        
        self.managedContext = document.managedObjectContext
        let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("ItemsTableViewController") as! UIViewController
        self.window?.rootViewController = vc
    }
    
} else {
    
    document.saveToURL(url, forSaveOperation: UIDocumentSaveOperation.ForCreating, completionHandler: { (success) -> Void in
        
        self.managedContext = document.managedObjectContext
        let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("ItemsTableViewController") as! UIViewController
        self.window?.rootViewController = vc
    })
}