Question

在经历了大约一千个问题之后，我已经放弃了并且正在寻求帮助。我有一个非常简单的表使用自定义单元格。按下按钮时，会向阵列中添加一个新项目，并且表格应更新以显示新项目。那没有发生。数据全部正确移动，但让表更新的唯一方法是退出并重新启动应用程序。下面的代码中删除了关于定义变量等的不必要的部分。谢谢！

更新：我删除，重新创建并重新链接了表格和原型单元格而没有任何变化。

class DispatchTableViewCell: UITableViewCell {

@IBOutlet weak var routeLabel: UILabel!
@IBOutlet weak var aircraftLabel: UILabel!
@IBOutlet weak var altitudeLabel: UILabel!
@IBOutlet weak var speedLabel: UILabel!
@IBOutlet weak var statusLabel: UILabel!
@IBOutlet weak var departureTimeLabel: UILabel!
@IBOutlet weak var arrivalTimeLabel: UILabel!
@IBOutlet weak var remainingTimeLabel: UILabel!
@IBOutlet weak var progressBar: UIProgressView!

}





class DispatchViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

@IBOutlet weak var flightsTableView: UITableView!

@IBAction func dispatchButton(_ sender: Any) {

    flightsTableView.beginUpdates()

// Do all the things to update the array
// Works fine, array is correct

    flightsTableView.endUpdates()

}

let realm = try! Realm()

var flightsArray: [Flight] = []
var originsArray: [String] = []
var destinationsArray: [String] = []
var aircraftNamesArray: [String] = []
var departureTimesArray: [Date] = []
var arrivalTimesArray: [Date] = []
var speedsArray: [Double] = []
var altitudesArray: [Double] = []

override func viewDidLoad() {
    flightsTableView!.dataSource = self
    flightsTableView!.delegate = self
    super.viewDidLoad()
}

override func viewWillAppear(_ animated: Bool) {

flightsTableView.beginUpdates()
    for flight in realm.objects(Flight.self) {
        flightsArray.append(flight)
    }
    for flight in flightsArray {
        originsArray.append(flight.originCode)
        destinationsArray.append(flight.destinationCode)
        aircraftNamesArray.append(flight.aircraftNameShort)
        departureTimesArray.append(flight.departureTime)
        arrivalTimesArray.append(flight.arrivalTime)
        speedsArray.append(flight.cruiseSpeed)
        altitudesArray.append(flight.cruiseAltitude)
    }
    flightsTableView.endUpdates()

}

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

    return 1

}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return flightsArray.count
}

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat
{
    return 90
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "flight", for: indexPath) as! DispatchTableViewCell

    let origin = originsArray[indexPath.row]
    let destination = destinationsArray[indexPath.row]

    cell.routeLabel?.text = "\(origin) -> \(destination)"
    print(cell.routeLabel)
    cell.aircraftLabel?.text = aircraftNamesArray[indexPath.row]

    cell.altitudeLabel?.text = "Altitude: \(Int(altitudesArray[indexPath.row]))"

    cell.speedLabel?.text = "Speed: \(Int(speedsArray[indexPath.row]))"

    cell.statusLabel?.text = "Test"

    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "h:mm a"
    dateFormatter.timeZone = TimeZone.current
    //tempFlight.departureTime = dateFormatter.string(from: tempFlight.departureTime)
    //tempFlight.arrivalTime = dateFormatter.string(from: tempFlight.arrivalTime)

    cell.departureTimeLabel?.text = dateFormatter.string(from: departureTimesArray[indexPath.row])

    cell.arrivalTimeLabel?.text = dateFormatter.string(from: arrivalTimesArray[indexPath.row])

    return cell


}

}

Answer 1

.beginUpdates() / .endUpdates()实际上不会导致表视图重新加载它显示的内容。

您正在更新数据源，您应该通过调用you can list all of a user's gists让表格视图了解更改，以便它会向数据源询问您所做的更改并重新组织其内容： / p>

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

    for flight in realm.objects(Flight.self) {
        flightsArray.append(flight)
    }

    for flight in flightsArray {
        originsArray.append(flight.originCode)
        destinationsArray.append(flight.destinationCode)
        aircraftNamesArray.append(flight.aircraftNameShort)
        departureTimesArray.append(flight.departureTime)
        arrivalTimesArray.append(flight.arrivalTime)
        speedsArray.append(flight.cruiseSpeed)
        altitudesArray.append(flight.cruiseAltitude)
    }

    flightsTableView.reloadData()
}

Answer 2

我在按钮Could not deduce (IConnection (IO Connection)) arising from a use of ‘quickQuery'’ from the context: convertible-1.1.1.0:Data.Convertible.Base.Convertible a SqlValue bound by the inferred type of getPerson :: convertible-1.1.1.0:Data.Convertible.Base.Convertible a SqlValue => a -> IO [[SqlValue]]中调用.reloadData()但我没有从Realm检索新数据。

UITableView不会更新

2 个答案: