当我的NSException打开时，app正在“NSException类型的异常终止”

Question

我的应用程序，我一直在处理崩溃后，ViewDidAppears功能。我的错误：

Assertion failure in -[UITableView _configureCellForDisplay:forIndexPath:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit/UIKit-3600.6.22/UITableView.m:8042
2017-02-08 01:58:53.747017 APP_Name[841:223668] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UITableView (<UITableView: 0x1018d4000; frame = (0 0; 375 667); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0x174056d70>; layer = <CALayer: 0x174037200>; contentOffset: {0, 0}; contentSize: {375, 200}>) failed to obtain a cell from its dataSource (<App_Name.FindAParrty: 0x101242370>)'
*** First throw call stack:
(0x18d1611b8 0x18bb9855c 0x18d16108c 0x18dc1902c 0x193157d3c 0x193359bc4 0x193359d88 0x193347320 0x19335edec 0x1930fade8 0x193013a80 0x1904c19d8 0x1904b64cc 0x1904b638c 0x1904333e0 0x19045aa68 0x19045b488 0x18d10e0c0 0x18d10bcf0 0x18d10c180 0x18d03a2b8 0x18eaee198 0x1930817fc 0x19307c534 0x1000c5e58 0x18c01d5b8)
libc++abi.dylib: terminating with uncaught exception of type NSException

在做了研究之后，我读到一个可能的错误是，我没有命名一个重用标识符，但是我这样做了，之后我就不知所措了。我不知道我是不是错过了什么或者是什么交易。

下面是参考文献的TableView：

class FindAParty:UITableViewController{

    var partyData:NSMutableArray! = NSMutableArray()
    //var user:NSMutableArray = NSMutableArray()

    override init(style: UITableViewStyle){
        super.init(style: style)

    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        //fatalError("init(coder:) has not been implemented")

    }


    @IBAction func loadData(){
        print ("Load Data went through")
        partyData.removeAllObjects()
        print ("Remove ALL Objeccts")
        let findPartyData:PFQuery = PFQuery(className: "Party")
        print("PFQuery...")
        findPartyData.findObjectsInBackground{
            (objects:[PFObject]?, error:Error?)->Void in

            if error != nil {

                print("Error")


            }else{

                for object in objects!{

                    let party:PFObject = object as PFObject
                    self.partyData.add("party")
                    }

                let array:NSArray = self.partyData.reverseObjectEnumerator().allObjects as NSArray
                self.partyData = NSMutableArray(array: array)

                self.tableView.reloadData()

            }
        }
    }

    override func viewDidAppear(_ animated: Bool) {
        self.loadData()
        print("View Did Appear")
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        print("ViewDidLoad")
        //self.loadData()
        // Uncomment the following line to preserve selection between presentations
        // self.clearsSelectionOnViewWillAppear = false

        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
        // self.navigationItem.rightBarButtonItem = self.editButtonItem
    }

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

    // #pragma mark - Table view data source

    func numberOfSectionsInTableView(tableView: UITableView?) -> Int {
        // #warning Potentially incomplete method implementation.
        // Return the number of sections.
        return 1
    }

    override func tableView(_ tableView: UITableView?, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete method implementation.
        // Return the number of rows in the section.
        return partyData.count
    }


    func tableView(tableView: UITableView?, cellForRowAtIndexPath indexPath: NSIndexPath?) -> UITableViewCell? {
        let cell:FindAPartyCell = tableView!.dequeueReusableCell(withIdentifier: "Cell", for: indexPath! as IndexPath) as! FindAPartyCell

        let party:PFObject = self.partyData.object(at: indexPath!.row) as! PFObject

        cell.typeOfPartyLabel.alpha = 0
        cell.timeOfPartyLabel.alpha = 0
        cell.usernameLabel.alpha = 0

        cell.typeOfPartyLabel.text = party.object(forKey: "partyTitle") as? String
        cell.timeOfPartyLabel.text = party.object(forKey: "partyTime") as? String
        cell.usernameLabel.text = party.object(forKey: "Username") as? String

       // var dataFormatter:NSDateFormatter = NSDateFormatter()
        //dataFormatter.dateFormat = "yyyy-MM-dd HH:mm"
        //cell.timestampLabel.text = dataFormatter.stringFromDate(sweet.createdAt)

        let findUser:PFQuery = PFUser.query()!
        findUser.whereKey("objectId", equalTo: party.object(forKey: "Username")!)



        findUser.findObjectsInBackground {
            (objects:[PFObject]?, error: Error?) -> Void in // Changes NSError to Error
            if error == nil{

                let user:PFUser = (objects)!.last as! PFUser
                cell.usernameLabel.text = user.username

                UIView.animate(withDuration: 0.5, animations: {
                    cell.typeOfPartyLabel.alpha = 1
                    cell.timeOfPartyLabel.alpha = 1
                    cell.usernameLabel.alpha = 1
                })
            }
        }


        return cell
    }
}

Answer 1

1. 您正在使用表视图的旧委托方法，请使用以下方法： func numberOfSections( tableView: UITableView) -> Int {返回xxx } func tableView(_ tableView: UITableView，numberOfRowsInSection节: Int) -> Int { cell xxx } func tableView(_ tableView: UITableView，cellForRowAt indexPath: IndexPath)FindAPartyCell返回单元}
2. 您确定您的原型Cell标识符是在IB中用FindAPartyCell分配的吗？
3. 尽量不要在findUser.findObjectsInBackground方法中执行cellForRowAt操作。