Question

有些日子我正在尝试调整一个问题，导致我的应用在解雇期间崩溃，我的代码就是这个

import UIKit
import MapKit
import CoreLocation

class CourseClass: UITableViewController, CLLocationManagerDelegate, MKMapViewDelegate {
    @IBOutlet weak var map: MKMapView!
     struct User {

        var name: String
        var images: UIImage
        var coordinate: (Double, Double)
        var type: String
        var address: String
    }
    var rows = 0 
   var users = [User]()

    let CS = User(name: "Sporting Club", images: UIImage(named: "Caffè Spagar.png")! , coordinate:(12345,54678), type: "Sport", address: "Via dei Cocchieri, 1A")
    let D = User(name: "94Tele", images: UIImage(named: "Duks.png")! , coordinate:(13345,54128), type: "Restaurant", address: "Via della Madonna dei Monti, 94")
    let PS = User(name: "Chiostro del Bramante ", images: UIImage(named: "Posta station.png")! , coordinate:(18795,34556), type: "Museum", address: "Arco della Pace, 5")
    let B = User(name: "Teatro Sala Umberto", images: UIImage(named: "Barnum.png")! , coordinate:(46655,43554), type: "Theater", address: "Via della Mercede, 50")
    let EC = User(name: "Mangiarte", images: UIImage(named: "Elephant Club.png")! , coordinate:(12325,21435), type: "Restaurant", address: "Via degli Equi, 16")

    override func viewDidLoad() {
        super.viewDidLoad()
      map.showsUserLocation = true
      map.delegate = self

      users.append(CS)
      users.append(D)
      users.append(PS)
      users.append(B)
      users.append(EC)
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        insertRowsMode3()
    }

    func insertRowsMode2() {
        for i in 0..<users.count {
            insertRowMode2(ind: i, usr: users[i])
        }
    }

    func insertRowMode2(ind:Int,usr:User) {

        let indPath = IndexPath(row: ind, section: 0)

        rows = ind + 1
        tableView.insertRows(at: [indPath], with: .right)
    }    

   func insertRowsMode3() {
        rows = 0  
        insertRowMode3(ind: 0)
    }

  func insertRowMode3(ind:Int) {
        let indPath = IndexPath(row: ind, section: 0)
        rows = ind + 1
        tableView.insertRows(at: [indPath], with: .right)

        guard ind < users.count-1 else { return }
        DispatchQueue.main.asyncAfter(deadline: .now()+0.15) {

            self.insertRowMode3(ind: ind+1)
        }
    }

    override func numberOfSections(in tableView: UITableView) -> Int {

        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

        return rows
    }

    public override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

      let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! MyTableViewCell

      let user = users[indexPath.row]

        cell.myImage.image = user.images
        cell.myLabel.text = user.name
        cell.myTypeLabel.text = user.type

        return (cell)
    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

       performSegue(withIdentifier: "goToLast" , sender: users[indexPath.row])

    }

    override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 100
    }

    @IBAction func mapTapped(_ sender: UITapGestureRecognizer) {

        let latitude:CLLocationDegrees = 41.8919300
        let longitude:CLLocationDegrees = 12.5113300

        let regionDistance:CLLocationDistance = 1000;
        let coordinates = CLLocationCoordinate2DMake(latitude, longitude)
        let regionSpan = MKCoordinateRegionMakeWithDistance(coordinates, regionDistance, regionDistance)

        let options = [MKLaunchOptionsMapCenterKey: NSValue(mkCoordinate: regionSpan.center), MKLaunchOptionsMapSpanKey: NSValue(mkCoordinateSpan: regionSpan.span)]

        let placemark = MKPlacemark(coordinate: coordinates)
        let mapItem = MKMapItem(placemark: placemark)
        mapItem.name = "My House"
        mapItem.openInMaps(launchOptions: options)

    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "goToLast" {

        guard let vc = segue.destination as? FinalClass else { return }

        let guest = segue.destination as! FinalClass

             if let user = sender as? User {

            guest.local = user.name

             guest.localImage = user.images

            guest.localType = user.type

            guest.localAddress = user.address
            }
        }
    }

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

}

所以当我进入另一个场景时，一切都还可以，但是当我想回来时

@IBAction func lastBack(_ sender: Any) {

    dismiss(animated: true, completion: nil)
    }

我的应用因此而崩溃

“因未捕获的异常而终止应用程序'NSInternalInconsistencyException'，原因：'无效更新：第0节中的行数无效。更新后的现有部分中包含的行数（1）必须等于更新前的该部分中包含的行（5），加上或减去从该部分插入或删除的行数（插入1个，删除0个）以及加入或减去移入或移出该部分的行数（0移动） in，0搬出去。'

我真的不知道如何调整代码以使其正常工作。

Answer 1

错误本身就说问题了。与rows数据存在一些不一致。

正如您所看到的，当您第一次访问此CourseClass控制器时，您正在通过调用insertRowsMode3中的viewDidAppear来设置行。

 override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    insertRowsMode3()
}

问题是，当您返回时，row数据与您使用zero初始化的数据不同，并且viewDidAppear未被调用。我建议避免将data放入或查看控制器，它会违反MVC的核心架构，包括错误位置的数据层。

当我回到TableViewController时应用程序崩溃

1 个答案: