自定义 UITableViewCell - 不显示

Question

我是 Swift 新手。 我尝试制作一个自定义的 TableView 并在 StoryBoard 中添加了一个原型单元

我在单元格的检查器中添加了自定义类

这里是代码：

class SearchTableViewCell: UITableViewCell {

    @IBOutlet var routeDescriptionLbl: UILabel!
    @IBOutlet var ivRoute: UIImageView!
    @IBOutlet var distanceLbl: UILabel!
    @IBOutlet var routeNumberLbl: UILabel!


    override func awakeFromNib() {
     //still empty yet
        super.awakeFromNib()

    }

    override func setSelected(selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }
}

现在我做了一个标识符：

这是整个视图（部分）的视图控制器：

class SearchViewController: UIViewController, UITableViewDataSource, UITableViewDelegate{

    var transportData : [RouteModel] = []

    override func viewDidLoad() {
                super.viewDidLoad()
        fillMockup()
        self.lvMain.reloadData() //in case it's needed after mockup is filled

    }

    override func didReceiveMemoryWarning() {

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

    override func viewDidAppear(animated: Bool) {

        NSLog("viewDidAppear")
    }

    func fillMockup(){
//just some mockup data to test if it's working
        transportData.append(RouteModel(type: RouteModel.TYPE_BUS,routeNumber: "44", description: "Ярославль - Сан Тропе",dist: "200 m"))
        transportData.append(RouteModel(type: RouteModel.TYPE_TRAM,routeNumber: "11", description: "Ярославль - Сан Тропе",dist: "400 m"))
        transportData.append(RouteModel(type: RouteModel.TYPE_R_BUS,routeNumber: "1", description: "Ярославль Главный - Жопа Мира",dist: "1.4 км"))
        transportData.append(RouteModel(type: RouteModel.TYPE_TROLLEY,routeNumber: "24", description: "Ярославль - Малые Гребеня",dist: "1.4 км"))
        transportData.append(RouteModel(type: RouteModel.TYPE_BUS,routeNumber: "43", description: "Ярославль - Малые Гребеня",dist: "1.4 км"))
        transportData.append(RouteModel(type: RouteModel.TYPE_BUS,routeNumber: "43а", description: "Ярославль - Малые Гребеня",dist: "1.4 км"))
        transportData.append(RouteModel(type: RouteModel.TYPE_BUS,routeNumber: "85б", description: "Ярославль - Брагино",dist: "1.4 км"))
        transportData.append(RouteModel(type: RouteModel.TYPE_BUS,routeNumber: "38", description: "Ярославль - Брагино",dist: "2.4 км"))
    }

    public func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
        NSLog("transportData.count = \(transportData.count)")
        return transportData.count
    }

    public func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("reuseIdentifier") as? SearchTableViewCell
        if let cell = cell {
            cell.routeNumberLbl.text = transportData[indexPath.row].routeNumber
            cell.routeDescriptionLbl.text = transportData[indexPath.row].description
            cell.distanceLbl.text = transportData[indexPath.row].dist

            return cell
        }

        return UITableViewCell()

    }

    func tableView(tableView: UITableView,
                   didSelectRowAtIndexPath indexPath: NSIndexPath){
        NSLog("You selected cell #\(indexPath.row)!")
        let position = indexPath.row;
        tableView.deselectRowAtIndexPath(indexPath, animated: false)
    }
}

现在，没有调用表视图中的任何日志。当然，TableView 没有显示

有什么问题？

Answer 1

喜欢

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

    let cell: SearchTableViewCell = self.tableView.dequeueReusableCellWithIdentifier("reuseIdentifier") as! SearchTableViewCell

     cell.routeNumberLbl.text = transportData[indexPath.row].routeNumber
        cell.routeDescriptionLbl.text = transportData[indexPath.row].description
        cell.distanceLbl.text = transportData[indexPath.row].dist

    return cell
}

更新答案

override func viewDidLoad() {
                super.viewDidLoad()
          self.lvMain.delegate = self // invoke data source and delegate on current class
         self.lvMain.dataSource = self
        fillMockup()



    }

  func fillMockup(){
//just some mockup data to test if it's working
        transportData.append(RouteModel(type: RouteModel.TYPE_BUS,routeNumber: "44", description: "Ярославль - Сан Тропе",dist: "200 m"))
        transportData.append(RouteModel(type: RouteModel.TYPE_TRAM,routeNumber: "11", description: "Ярославль - Сан Тропе",dist: "400 m"))
        transportData.append(RouteModel(type: RouteModel.TYPE_R_BUS,routeNumber: "1", description: "Ярославль Главный - Жопа Мира",dist: "1.4 км"))
        transportData.append(RouteModel(type: RouteModel.TYPE_TROLLEY,routeNumber: "24", description: "Ярославль - Малые Гребеня",dist: "1.4 км"))
        transportData.append(RouteModel(type: RouteModel.TYPE_BUS,routeNumber: "43", description: "Ярославль - Малые Гребеня",dist: "1.4 км"))
        transportData.append(RouteModel(type: RouteModel.TYPE_BUS,routeNumber: "43а", description: "Ярославль - Малые Гребеня",dist: "1.4 км"))
        transportData.append(RouteModel(type: RouteModel.TYPE_BUS,routeNumber: "85б", description: "Ярославль - Брагино",dist: "1.4 км"))
        transportData.append(RouteModel(type: RouteModel.TYPE_BUS,routeNumber: "38", description: "Ярославль - Брагино",dist: "2.4 км"))

      self.lvMain.reloadData() //reload the table when does loaded perfectly 
    }


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

    let cell: SearchTableViewCell = self.tableView.dequeueReusableCellWithIdentifier("reuseIdentifier") as! SearchTableViewCell

     cell.routeNumberLbl.text = transportData[indexPath.row].routeNumber
        cell.routeDescriptionLbl.text = transportData[indexPath.row].description
        cell.distanceLbl.text = transportData[indexPath.row].dist

    return cell
}

更多示例见this

Answer 2

在viewDidLoad()函数内添加两行

self.yourtableviewname.delegate = self
self.yourtableviewname.dataSource = self

Answer 3

发生这种情况是因为您的单元格总是创建一个新实例，因为它没有进入 if 部分。因此，请检查您的单元格是否为 nil，然后像这样创建您的单元格的实例..

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

    var cell: MyCell! = tableView.dequeueReusableCellWithIdentifier("reuseIdentifier")

    if cell == nil {
                tableView.registerNib(UINib(nibName: "MyCell", bundle: nil), forCellReuseIdentifier: "reuseIdentifier")
               cell =tableView.dequeueReusableCellWithIdentifier(identifier) as? MyCell
            }
    return cell
  }
}

这里的 MyCell 是自定义单元格。

Answer 4

如果您正在使用情节提要，请从 viewdidload 函数中删除此行

self.tableView.register(CustomTableViewCell.self, forCellReuseIdentifier: cellReuseIdentifier)

它对我有用。

Answer 5

您可以通过以下两个步骤检查您是否忘记执行任何操作

1)交叉检查是否连接了Datasource、Delegate和IBoutlet For tableview？

2)检查你在Storyboard中设置的标识符是否与reuseIdentifier相同？

Answer 6

您需要在 viewDidLoad 或 Stroyboard 中自定义 tableView Delegate 和 Datasource。

override func viewDidLoad() {
  super.viewDidLoad()

  tableViewName.delegate = self
  tableViewName.dataSource = self
}