當我Swift2使用CoreData，我得到了線程1：AppDelegate中的EXC_BAD_ACCESS文件

Question

我剛學的iOS學生，我使用CoreData

任何一個可以告訴我，爲什麼錯誤發生時感覺不好？

error picture

import UIKit 
import CoreData 

class AToZViewController: UIViewController, UITableViewDataSource, UITableViewDelegate { 

    var baseURL = "monashcaulfield.maps.arcgis.com/apps/webappviewer/index.html?id=" 

    var managedObjectContext: NSManagedObjectContext 


    var wildlifeList: NSArray 


    required init?(coder aDecoder: NSCoder){ 



    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate 
    self.managedObjectContext = appDelegate.managedObjectContext 

    self.wildlifeList = NSArray() 

    super.init(coder: aDecoder) 
    } 

    @IBOutlet weak var tableView: UITableView! 



    // data for A to Z dictionary 

    var name = ["Blue-billed Duck", 
       "Brush-tailed Rock-wallaby", 
       "Grey-headed Flying-fox", 
       "King Quail", 
       "Mallee Worm-Lizard", 
       "Mountain Pygmy-possum", 
       "Pink-tailed Worm-Lizard", 
       "Red-chested Button-quail", 
       "South-eastern Long-eared Bat" 
       ] 

    var nameTwo = ["Oxyura australis", 
        "Petrogale penicillata", 
        "Pteropus poliocephalus", 
        "Coturnix chinensis victoriae", 
        "Aprasia aurita", 
        "Burramys parvus", 
        "Aprasia parapulchella", 
        "Turnix pyrrhothorax", 
        "Nyctophilus corbeni" 
        ] 

    var pic = [UIImage(named: "004"), 
       UIImage(named: "006"), 
       UIImage(named: "007"), 
       UIImage(named: "002"), 
       UIImage(named: "008"), 
       UIImage(named: "005"), 
       UIImage(named: "009"), 
       UIImage(named: "003"), 
       UIImage(named: "001")] 

    var dist = ["acd6ceac78df451aa046bdea250fb4d4", 
       "fef94a3835f844939294bb0a32c473f0", 
       "e4e9a00590b2498d866910de81b2f44a", 
       "72e59910fc8448c5a1d2a83195361382", 
       "87faf8f5e5f84646aa2cd535135863e3", 
       "bbc166cc95a244e7bde4da6b0051405e", 
       "d43b723f23244ae0882bd618818366fbv", 
       "a8b77ed3aa084f6b97485bda3acf8c48", 
       "ab6d7601ec2b48d2ad2ba6add73f3591" 
       ] 





    override func viewDidLoad() { 
     super.viewDidLoad() 

     let fetchRequest = NSFetchRequest() 

     let entityDescription = NSEntityDescription.entityForName("List", inManagedObjectContext: self.managedObjectContext) 

     fetchRequest.entity = entityDescription 



     do{ 
      self.wildlifeList = try self.managedObjectContext.executeFetchRequest(fetchRequest) 

      if self.wildlifeList.count == 0 

      { 
       addWildlifeData() 
      } 

     } 
     catch{ 
      let fetchError = error as NSError 
      print(fetchError) 
     } 

     // Do any additional setup after loading the view. 
    } 


    func addWildlifeData(){ 

    var data = NSEntityDescription.insertNewObjectForEntityForName("List", inManagedObjectContext: self.managedObjectContext)as? List 

    data!.id = "a10012" 
    data!.name = "King Quail" 
    data!.nameTwo = "Coturnix chinensis victoriae" 
    data!.dist = "72e59910fc8448c5a1d2a83195361382" 
    data!.cata = "ot" 
    data!.pic = "002" 


    data = NSEntityDescription.insertNewObjectForEntityForName("List", inManagedObjectContext: self.managedObjectContext)as? List 

    data!.id = "a10019" 
    data!.name = "Red-chested Button-quail" 
    data!.nameTwo = "Turnix pyrrhothorax" 
    data!.dist = "a8b77ed3aa084f6b97485bda3acf8c48" 
    data!.cata = "ot" 
    data!.pic = "003" 


    saveRecords() 




    } 



    func saveRecords(){ 


    do{ 
     try self.managedObjectContext.save() 
     let fetchRequest = NSFetchRequest() 
     let entityDescription = NSEntityDescription.entityForName("List", inManagedObjectContext: self.managedObjectContext) 
     fetchRequest.entity = entityDescription 

     do{ 
      self.wildlifeList = try self.managedObjectContext.executeFetchRequest(fetchRequest) as! [List] 
     } 
     catch{ 
      let fetchError = error as NSError 
      print (fetchError) 
     } 
    } 
    catch let error{ 
     print("Could not save Deletion \(error)") 
    } 

    } 

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


    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int{ 
     //return name.count 

     return self.wildlifeList.count 
    } 


    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 

     let cell = self.tableView.dequeueReusableCellWithIdentifier("AToZCell", forIndexPath: indexPath) as! AToZTableViewCell 



     let l: List = self.wildlifeList[indexPath.row] as! List 

     cell.label.text = l.name 
     cell.labelTwo.text = l.nameTwo 

     let picNumber = l.pic 

     cell.imagePic.image = UIImage(named: picNumber!) 


     return cell 
    } 





    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 




     if(segue.identifier == "AToZSegue") { 

      let indexPathTwo = self.tableView.indexPathForSelectedRow! 

      let l: List = self.wildlifeList[indexPathTwo.row] as! List 

      let distAddress = l.dist 

      let combineURL = self.baseURL + distAddress! 

      print(combineURL) 

      if let destinationVC = segue.destinationViewController as? ShowDetailSegueViewController{ 
       destinationVC.currentURL = combineURL 



      } 
     } 




    } 





    /* 
    // MARK: - Navigation 

    // In a storyboard-based application, you will often want to do a little preparation before navigation 
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
    // Get the new view controller using segue.destinationViewController. 
    // Pass the selected object to the new view controller. 
    } 
    */ 




    ///let alertController = UIAlertController() 



} 

Answer 1

既然你不使用NSFetchedResultsController它並不需要分配在init方法可能造成的錯誤，因爲AppDelegate可能還沒有被初始化的管理對象範圍內。

刪除init方法和把代碼中viewDidLoad()

override func viewDidLoad() { 
    super.viewDidLoad() 
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate 
    self.managedObjectContext = appDelegate.managedObjectContext 
} 

並使用夫特陣列而不是類型未指定NSArray爲數據源

var wildlifeList = [List]()