UILabel werfend Thread1: EXC_BAD_ACCESS (Code = 1, Adresse 0x ...) in Swift 2

Question

wenn ich die Daten aus der Valise, Tabellenansicht Controller (SelectedCity), App Absturz und Fehler machen möchte: Thread1: EXC_BAD_ACCESS (code = 1, Adresse 0x ...) Fehler ist in Zeile labelcity!.text = tit Varibale Tit nicht Problem, ich denke, das Problem liegt in der UIlabel (Labelcity)

können Sie mir helfen?

AircraftSearch

class AircraftSearch: UIViewController ,SendbackDelegate{ 

    @IBOutlet weak var Mabda: UIButton! 
    @IBOutlet weak var maghsad: UIButton! 
    @IBOutlet weak var labelcity: UILabel! 


    var Airurl = NSURL() 
    var ScrOrDstArray = [MabdaAndMaghsad]() 
    var origin = [String]() // save mabda 
    var purpose = [String]() // save maghsad 
    var sendDataToTableview = [String]() 
    var tit = String() 


    override func viewWillAppear(animated: Bool) { 
     super.viewWillAppear(animated) 

     navigationController?.setNavigationBarHidden(false, animated: true) 
    } 


    override func viewDidLoad() { 
     super.viewDidLoad() 
     GetPassCity() 

    } 

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

    @IBAction func selectMabda(sender: AnyObject) { 
     sendDataToTableview = origin 
     performSegueWithIdentifier("SelectedCellSegue", sender: sender) 


    } 

    @IBAction func selectMaghsad(sender: AnyObject) { 
     sendDataToTableview = purpose 
     print(sendDataToTableview) 
     performSegueWithIdentifier("SelectedCellSegue", sender: sender) 

    } 


    func originAndpurpose() { 
     let dataCity = ScrOrDstArray 
     for i in dataCity{ 

      if i.SrcOrDst == true{ 
       origin.append(i.Name) 
      }else{ 
       purpose.append(i.Name) 
      } 
     } 
    } 
func sendNameToPreviousVC(SelectCity: String) { 
print("\(tit) selected ") //return data 

     tit = SelectCity 
     labelcity!.text = tit 

    } 
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
    if segue.identifier == "SelectedCellSegue" { 
     if let VC = segue.destinationViewController as? SelectedCity { 

      VC.toTake = sendDataToTableview 
      VC.delegate = self 
     } 
    } 

} 

} 

SelectedCity Ansicht

import UIKit 
protocol SendbackDelegate:class { 
    func sendNameToPreviousVC(City:String) 
} 

class SelectedCity: UITableViewController { 
    var toTake = [String]() 
    var selecteCity = String() 
    weak var delegate: SendbackDelegate? = nil 

    override func viewDidLoad() { 
     super.viewDidLoad() 


    } 

    override func viewWillAppear(animated: Bool) { 
     super.viewWillAppear(animated) 

     navigationController?.setNavigationBarHidden(false, animated: true) 
    } 

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

    // MARK: - Table view data source 


    override func numberOfSectionsInTableView(tableView: UITableView) -> Int { 
     // #warning Incomplete implementation, return the number of sections 
     return 1 
    } 

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     // #warning Incomplete implementation, return the number of rows 
     return toTake.count ?? 0 

    } 

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 
     let cell = tableView.dequeueReusableCellWithIdentifier("stcell", forIndexPath: indexPath) as? mAndMCell 

     let nameCity = toTake[indexPath.row] 
     print(nameCity) 

     cell!.nameCityLabel.text = nameCity 
     return cell! 
    } 

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath){ 

     let indexPath = tableView.indexPathForSelectedRow! 
     let currentCell = tableView.cellForRowAtIndexPath(indexPath) as! mAndMCell! 

     selecteCity = currentCell.nameCityLabel!.text as String! 

     sendBackIdCity(selecteCity) 
     navigationController?.popViewControllerAnimated(true) 



    } 
    func sendBackIdCity(name: String){ 
     self.delegate?.sendNameToPreviousVC(name) 

    } 

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
     if segue.identifier == "backCitySegue"{ 
      var VCOne = segue.destinationViewController as? AircraftSearch 
      self.delegate = VCOne 


     } 
    } 

} 

Answer 1

Statt

@IBOutlet weak var labelcity: UILabel? = UILabel() 

Versuch:

@IBOutlet weak var labelcity: UILabel! 

Answer 2

Betrachten schwach Schlüsselwort in der Deklaration von Eigenschaften zu entfernen. Die Verwendung dieses Schlüsselworts verhindert, dass das gerade erstellte UILabel-Objekt beibehalten wird. Daher wird das Objekt sofort freigegeben.

var labelcity: UILabel? = UILabel() 

Oder eine andere Option ist Objektinstanziierung in viewDidLoad Methode zu bewegen:

var labelcity: UILabel! 
... 
override func viewDidLoad() { 
    super.viewDidLoad() 
    let label = UILabel() 
    //you code for subview adding into view controller's view 
    labelcity = label 
    GetPassCity() 
} 

Answer 3

ich das Problem gelöst:

override func viewDidLoad() { 
     super.viewDidLoad() 
     labelcity.text = tit 
     GetPassCity() 
    } 


func sendNameToPreviousVC(SelectCity: String) { 
      tit = SelectCity 
     }