Segue查看控制器崩潰

Question

任何人都可以告訴我我在這裏做錯了嗎？我有一個我正在設計的小應用程序，它是從我的核心數據中添加，編輯和刪除用戶。但是，當我選擇一行時，我的應用程序崩潰，應該把我帶到下一個viewController。 錯誤是：'致命錯誤：意外地發現零，而解包一個可選值' 它在這個鑄造中準備segue函數失敗：讓聯繫人：Contact = fetchedResultController.objectAtIndexPath（indexPath！）as！聯繫

所以當我點擊一行時，它必須繼續下一個視圖控制器。

這是我的代碼：

//類ContactsTableViewController

import UIKit 
import CoreData 

class ContactsTableViewController: UITableViewController, NSFetchedResultsControllerDelegate{ 

    // MARK: - Properties 
    let context = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext 
    var fetchedResultController: NSFetchedResultsController = NSFetchedResultsController() 


    // MARK: - Actions 
    @IBAction func toggleMe(sender: AnyObject) { 
     UberSideBar.toggleWindow() 
    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     fetchedResultController = getFtechedResultController() 
     fetchedResultController.delegate = self 
     fetchedResultController.performFetch(nil) 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 

    // MARK: - Table view data source 

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int { 
     let numberOfSection = fetchedResultController.sections?.count 
     return numberOfSection! 
    } 

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     let numberOfinASection = fetchedResultController.sections?[section].numberOfObjects 
     return numberOfinASection! 
    } 

    // MARK: - Custom functions 
    func getFtechedResultController() -> NSFetchedResultsController { 
     fetchedResultController = NSFetchedResultsController(fetchRequest: taskFetchRequest(), managedObjectContext: context!, sectionNameKeyPath: nil, cacheName: nil) 
     return fetchedResultController 
    } 

    func taskFetchRequest() -> NSFetchRequest{ 
     let fetchRequest = NSFetchRequest(entityName: "Contact") 
     let sortDescriptor = NSSortDescriptor(key: "name", ascending: true) 
     fetchRequest.sortDescriptors = [sortDescriptor] 
     return fetchRequest 
    } 

    func controllerDidChangeContent(controller: NSFetchedResultsController) { 
     // Refresh tableview to fetch all data 
     tableView.reloadData() 
    } 

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 
     let cell = tableView.dequeueReusableCellWithIdentifier("ContactCell", forIndexPath: indexPath) as! ContactcellTableViewCell 
     let contact = fetchedResultController.objectAtIndexPath(indexPath) as! Contact 
     println(contact.name) 
     cell.nameLabel?.text = contact.name 
     return cell 
    } 

    override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) { 
     let managedObject: NSManagedObject = fetchedResultController.objectAtIndexPath(indexPath) as! NSManagedObject 
     context?.deleteObject(managedObject) 
     context?.save(nil) 
    } 

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) { 
     performSegueWithIdentifier("editContact", sender: self) 
    } 

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
    if segue.identifier == "editContact" { 

     let indexPath = tableView.indexPathForSelectedRow() 
     let contactController: NewCategoryViewController = segue.destinationViewController as! NewCategoryViewController 
     let contact:Contact = fetchedResultController.objectAtIndexPath(indexPath!) as! Contact 
     contactController.contact = contact 

    } 
} 

} 和

import UIKit 
import CoreData 


class NewCategoryViewController: UIViewController { 

    // MARK: - Properties 
    var contact: Contact? = nil 

    // initialize the core data context: 
    let context = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext 

    // MARK: - Outlets 
    @IBOutlet weak var imageHolder: UIImageView! 
    @IBOutlet weak var nameField: UITextField! 
    @IBOutlet weak var emailField: UITextField! 
    @IBOutlet weak var phoneField: UITextField! 
    @IBOutlet weak var categoryField: UITextField! 

    // MARK: - Actions 
    @IBAction func savebtn(sender: AnyObject) { 

     let entity = NSEntityDescription.entityForName("Contact", inManagedObjectContext: context!) 
     let newContact = Contact(entity: entity!, insertIntoManagedObjectContext: context) 
      newContact.name = nameField.text 
      newContact.email = emailField.text 
      newContact.phone = phoneField.text 
      //newContact.photo = UIImageJPEGRepresentation(imageHolder.image, 1) 

     var error: NSError? 

     context?.save(&error) 

     if let errorSaving = error { 
      var alert = UIAlertController(title: "Alert", message: "Couldn't save contact !!!", preferredStyle: UIAlertControllerStyle.Alert) 
      alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.Default, handler: nil)) 
      self.presentViewController(alert, animated: true, completion: nil) 
     } else { 
      nameField.text = "" 
      emailField.text = "" 
      phoneField.text = "" 
      var alert = UIAlertController(title: "Alert", message: "Contact added", preferredStyle: UIAlertControllerStyle.Alert) 
      alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil)) 
      self.presentViewController(alert, animated: true, completion: nil) 
     } 

    } 


    override func viewDidLoad() { 
     super.viewDidLoad() 

     if contact != nil { 
      nameField.text = contact?.name 
      emailField.text = contact?.email 
      phoneField.text = contact?.phone 

     } 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 

} 

任何幫助將是非常讚賞

Answer 1

你不能投的發件人按照原樣準備聯繫單元表視圖單元類型ContactsTableViewController。

而不是做你在做什麼，爲了獲得indexPath的，根本就

let indexPath = tableView.indexPathForSelectedRow() 

並刪除這一行：

let cell = sender as! ContactcellTableViewCell