UIPickerView并不总是以3g显示值

Question

我有一个非常奇怪的错误，此应用程序中的应用程序使用模式视图控制器，在视图中我使用UIPickerView来显示名称。值应显示在RisorseUmaneUIPicker！奇怪的是，当您有时在移动设备上以3g向应用程序发送短信时，UIPickerView仍然是空的，一切都可以正常工作。我该如何解决这个问题？

我用邮递员检查了 json 请求，它总是正确的

视图：

class RisorseUmaneViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource, UITableViewDelegate, UITableViewDataSource {
//Dichiarazione Oggetti
//L'array User contiene le informazione su tutti gli utenti presenti nel database
private var UserLoad: [UserStruct] = []
private var RisorseUmaneUIPicker: UIPickerView = UIPickerView()
private let datePicker: UIDatePicker = UIDatePicker()
private let StartPicker: UIDatePicker = UIDatePicker()
private let EndPicker: UIDatePicker = UIDatePicker()
private let PausaPicker: UIDatePicker = UIDatePicker()
private var textView: UITextView = UITextView()
private var RisoseUmaneTableView: UITableView!
private var RisorseUmaneLoad: [RisorsaUmanaStruct] = []
private var SwitchRapportino: UISwitch = UISwitch()
//L'oggetto RisorsaUmana Rappresenta la risorsa che verrà inserita
public var Cantiere: Cantiere
private var RisorsaSelezionata: RisorsaUmana?
private var Extensioni: Extend = Extend()
public var Stato: String = "Inserimento"
private var RisorsaRapportino: Bool = false;

init(CantiereInterno: Cantiere) {
self.Cantiere = CantiereInterno
super.init(nibName: nil, bundle: nil)
}

required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
hideKeyboardWhenTappedAround()
self.view.backgroundColor = UIColor.white
self.navigationController?.setNavigationBarHidden(false, animated: true)
self.navigationItem.title = "Risorse Umane"
InitRisorseUmaneViewController();
//Modifica UiPickerView delle Risorse con l'utente che ha effettuato il login
print("Login di : (UserLoginDefault.Username)")
selectPicker(withText: UserLoginDefault.Username)
}
//Funzione di Configurazione Iniziale della View
private func InitRisorseUmaneViewController() {
//inizializzo il Cantiere
let displayWidth: CGFloat = self.view.frame.width
//Carico le Risorse
CaricaRisorse()
//Configurazione Label Risorsa
let label = UILabel(frame: CGRect(x: (self.view.frame.width / 2) - 150, y: 65, width: 90, height: 24))
label.font = UIFont(name: "HelveticaNeue-Bold", size: 16.0)
label.textAlignment = .center
label.text = "Risorsa: "
self.view.addSubview(label)
//Configurazione :impostazioni picker view
self.RisorseUmaneUIPicker = UIPickerView(frame: CGRect(x: (self.view.frame.width / 2) - 70, y: 50, width: 200, height: 50))
self.RisorseUmaneUIPicker.delegate = self
self.RisorseUmaneUIPicker.dataSource = self
self.RisorseUmaneUIPicker.backgroundColor = UIColor.white
self.view.addSubview(RisorseUmaneUIPicker)
//Configuro il DataTime Picker per la data
self.datePicker.frame = CGRect(x: 10, y: 100, width: self.view.frame.width, height: 80)
self.datePicker.timeZone = NSTimeZone.local
self.datePicker.backgroundColor = UIColor.white
self.datePicker.datePickerMode = UIDatePickerMode.date;
//Aggiunto un evento quando viene modificato il valore del datePicker
self.datePicker.addTarget(self, action: #selector(RisorseUmaneViewController.datePickerValueChanged(_:)), for: .valueChanged)
self.view.addSubview(datePicker)
//Congiurazione Ore di Inizio e Fine
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "HH:mm"
let dateStart = dateFormatter.date(from: "08:00")
let dateEnd = dateFormatter.date(from: "17:30")
let datePausa = dateFormatter.date(from: "01:30")
//Configuro il DataPicker di Start
self.StartPicker.frame = CGRect(x: (self.view.frame.width / 2) - 90, y: 190, width: 100, height: 40)
self.StartPicker.timeZone = NSTimeZone.local
self.StartPicker.backgroundColor = UIColor.white
self.StartPicker.datePickerMode = UIDatePickerMode.time
self.StartPicker.date = dateStart!
self.StartPicker.addTarget(self, action: #selector(RisorseUmaneViewController.SetDataInizio(sender:)), for: .valueChanged)
self.StartPicker.minuteInterval = 30
self.view.addSubview(StartPicker)
//Configuro il DataPicker di End
self.EndPicker.frame = CGRect(x: (self.view.frame.width / 2) + 60, y: 190, width: 100, height: 40)
self.EndPicker.timeZone = NSTimeZone.local
self.EndPicker.backgroundColor = UIColor.white
self.EndPicker.datePickerMode = UIDatePickerMode.time
self.EndPicker.date = dateEnd!
self.EndPicker.addTarget(self, action: #selector(RisorseUmaneViewController.SetDataFine(sender:)), for: .valueChanged)
self.EndPicker.minuteInterval = 30
self.view.addSubview(EndPicker)
//Configuro il DataPicker di Pausa
self.PausaPicker.frame = CGRect(x: (self.view.frame.width / 2) - 30, y: 250, width: 100, height: 40)
self.PausaPicker.timeZone = NSTimeZone.local
self.PausaPicker.backgroundColor = UIColor.white
self.PausaPicker.datePickerMode = UIDatePickerMode.time
self.PausaPicker.date = datePausa!
self.PausaPicker.addTarget(self, action: #selector(RisorseUmaneViewController.SetPausa(sender:)), for: .valueChanged)
self.PausaPicker.minuteInterval = 30
self.view.addSubview(PausaPicker)
//Configurazione Testo TextView
self.textView = UITextView(frame: CGRect(x: 0, y: 300, width: displayWidth, height: 85))
self.automaticallyAdjustsScrollViewInsets = false
textView.font = UIFont(name: "HelveticaNeue-Bold", size: 18.0)
textView.textAlignment = NSTextAlignment.justified
textView.textColor = UIColor.blue
textView.backgroundColor = UIColor.lightGray
self.view.addSubview(textView)
//Bottone per inserimento:
let ImageInserisci = UIImage(named: "inserisci.png") as UIImage?
let ButtonInserisciRisorsaUmana = UIButton()
ButtonInserisciRisorsaUmana.frame = CGRect(x: (self.view.frame.width / 2) - 180, y: 395, width: 80, height: 80)
ButtonInserisciRisorsaUmana.setImage(ImageInserisci, for: .normal)
ButtonInserisciRisorsaUmana.setTitleColor(UIColor.black, for: .normal)
ButtonInserisciRisorsaUmana.set(image: ImageInserisci, attributedTitle: NSAttributedString(string: "Inserisci"), at: UIButton.Position(rawValue: 1)!, width: 30, state: UIControlState.normal)
ButtonInserisciRisorsaUmana.addTarget(self, action: #selector(InserisciRisorsaButtonAction), for: .touchUpInside)
self.view.addSubview(ButtonInserisciRisorsaUmana)
//Bottone per tornare a schermata principale
let ImageReturn = UIImage(named: "return.png") as UIImage?
let buttonReturn = UIButton()
buttonReturn.frame = CGRect(x: (self.view.frame.width / 2) - 30, y: 395, width: 80, height: 80)
buttonReturn.backgroundColor = UIColor.white
buttonReturn.setImage(ImageReturn, for: .normal)
buttonReturn.setTitle("Go Home", for: .normal)
buttonReturn.addTarget(self, action: #selector(Return), for: .touchUpInside)
self.view.addSubview(buttonReturn)
//Configuro lo UISwitch per l'inserimento delle risorse nel cantiere
let labelRapportino = UILabel(frame: CGRect(x: (self.view.frame.width / 2) + 80, y: 395, width: 130, height: 21))
labelRapportino.text = "Rapportino?"
labelRapportino.font = UIFont(name: "HelveticaNeue-Bold", size: 16.0)
self.view.addSubview(labelRapportino)
SwitchRapportino = UISwitch(frame: CGRect(x: (self.view.frame.width / 2) + 100, y: 430, width: 0, height: 0))
SwitchRapportino.setOn(false, animated: true)
SwitchRapportino.addTarget(self, action: #selector(RisorseUmaneViewController.switchValueDidChange(sender:)), for: .valueChanged)
self.view.addSubview(SwitchRapportino)

//Stato Inserimento: l'utente sta inserendo delle risorse dentro una cantier
if(Stato == "Inserimento") {
RisorsaSelezionata = RisorsaUmana(CantiereInterno: Cantiere)
//Configurazione table view
RisoseUmaneTableView = UITableView(frame: CGRect(x: 0, y: 500, width: displayWidth, height: self.view.frame.height - 500))
RisoseUmaneTableView.register(CustomTableViewCellArticolo.self, forCellReuseIdentifier: "MyCell")
RisoseUmaneTableView.dataSource = self
RisoseUmaneTableView.delegate = self
RisoseUmaneTableView.tableFooterView = UIView()
RisoseUmaneTableView.rowHeight = 60
RisoseUmaneTableView.layer.borderWidth = 2.0
self.view.addSubview(RisoseUmaneTableView)
//Carica Le risorse Umane e chiamo i Metodi di configurazione
CaricaRisorseCantiere()
}
SetPausa(sender: PausaPicker)
SetDataInizio(sender: StartPicker)
SetDataFine(sender: EndPicker)
datePickerValueChanged(datePicker)
SwitchRapportino.isHidden = false
labelRapportino.isHidden = false
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func selectPicker(withText text: String) {
print("Testo: (text)")
if let index = self.UserLoad.index(where: { $0.Username == text }) {
print("Indice di riga: (index)")
RisorseUmaneUIPicker.selectRow(index, inComponent: 0, animated: true)
self.RisorseUmaneUIPicker.reloadAllComponents()
}
else {
print("text not found")
}
}
//Funzione per il caricamento delle risorse Umane
func CaricaRisorse() {
DispatchQueue.global(qos: .userInteractive).async {
let rtemp = User()
rtemp.CaricaUtenti(completion: { result in
self.UserLoad = result
self.RisorseUmaneUIPicker.reloadAllComponents()
});
}
}
@objc func SetPausa(sender: UIDatePicker) {
RisorsaSelezionata?.SetOrePausa(Pausa: Extensioni.CastFromDateToString_SqlServer_Pausa(mydate: PausaPicker.date))
}
@objc func SetDataFine(sender: UIDatePicker) {
RisorsaSelezionata?.SetOreFine(OreFine: Extensioni.CastFromDateToString_SqlServer_DateTime(mydate: EndPicker.date))
}
@objc func SetDataInizio(sender: UIDatePicker) {
RisorsaSelezionata?.SetOreInizio(OreInizio: Extensioni.CastFromDateToString_SqlServer_DateTime(mydate: StartPicker.date))
}
@objc func InserisciRisorsaButtonAction(sender: UIButton!) {
print("n Id Risorsa: (String(describing: RisorsaSelezionata?.GetIdUtente()))")
if(textView.text.isEmpty || RisorsaSelezionata?.GetIdUtente() == 0) {
let alertController = UIAlertController(title: title, message: "Attenzione non hai compilato tutti i campi", preferredStyle: .alert)
let OKAction = UIAlertAction(title: "OK", style: .default, handler: nil)
alertController.addAction(OKAction)
self.present(alertController, animated: true, completion: nil)
}
else { 
RisorsaSelezionata?.SetDescrizione(Descrizione: textView.text)
RisorsaSelezionata?.SetRisorsaRapporto(RisorsaRapportino: RisorsaRapportino)
if(Stato == "Inserimento") {
RisorsaSelezionata?.InserisciRisorsa(completion: { result in
if(result == true) {
self.CaricaRisorseCantiere()
}
else {
let alertController = UIAlertController(title: "Errore", message: "Non sono riuscito ad inserire la risorsa!", preferredStyle: .alert)
let OKAction = UIAlertAction(title: "OK", style: .default, handler: nil)
alertController.addAction(OKAction)
self.present(alertController, animated: true, completion: nil)
}
})
}
}
}
@objc func Return(sender: UIButton!) {
//self.performSegueToReturnBack()
let CantiereSelezionato = GestioneCantieriViewController(CantiereSet: self.Cantiere)
self.present(CantiereSelezionato, animated: true, completion: nil)
}
//Metodo delegato che ritorna il numero di righe
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return UserLoad.count
}
// Metodo delegato che ritorna il valore mostrato nella riga
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
RisorsaSelezionata?.SetIdUtente(IdUtente: UserLoad[row].IdUtente)
return UserLoad[row].Username
}
// Metodo Delato Chiamao quando viene selezionata unarigha
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
print("n UserLoad[row].IdUtente (UserLoad[row].IdUtente!)")
RisorsaSelezionata?.SetIdUtente(IdUtente: UserLoad[row].IdUtente!)
print("n ID Risorsa (String(describing: RisorsaSelezionata?.GetIdUtente()))")
}
//Number of Columns into UIPickerView
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
//this func get select Date from UIDatePicker
@objc func datePickerValueChanged(_ sender: UIDatePicker) {
RisorsaSelezionata?.SetData(Data: Extensioni.CastFromDateToString_SqlServer_DateTime(mydate: sender.date))
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return RisorseUmaneLoad.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
RisoseUmaneTableView.beginUpdates()
let cell = tableView.dequeueReusableCell(withIdentifier: "MyCell", for: indexPath) as! CustomTableViewCellArticolo
cell.layer.cornerRadius = 10
cell.layer.borderWidth = 1.0
cell.layer.borderColor = UIColor.gray.cgColor
cell.layer.masksToBounds = true
cell.labCodArt.text = RisorseUmaneLoad[indexPath.row].Risorsa
cell.labDescrizione.text = RisorseUmaneLoad[indexPath.row].Descrizione
cell.labPrezzo.text = ""
RisoseUmaneTableView.endUpdates()
return cell
}
func CaricaRisorseCantiere() {
if(Stato == "Inserimento") {
let rtemp = RisorsaUmana(CantiereInterno: Cantiere)
rtemp.CaricaRisorseUmaneCantiere(completion: { result in
self.RisorseUmaneLoad.removeAll()
self.RisorseUmaneLoad = result
DispatchQueue.main.async {
self.RisoseUmaneTableView.reloadData()
}
});
}
}
......

控制器：

func CaricaUtenti(completion: @escaping ([UserStruct]) -> Void) {
DispatchQueue.global(qos: .userInteractive).async {
let rtemp = UserModel()
rtemp.CaricaRisorse(completion: { result in
completion(result)
})
}
}

型：

func CaricaRisorse(completion: @escaping ([UserStruct]) -> ()) {
DispatchQueue.global(qos: .userInteractive).async {
let jsonrequest = JSON()
let jsonarray: [String: Any] = ["Default": "0"]
jsonrequest.GetArray(Tipo: "User", Router: "/RisorseUmane/CaricaRisorse", ValueArray: jsonarray, completion: { result in
completion(result as! [UserStruct])
})
}
}
func GetArray(Tipo: String, Router: String, ValueArray: [String: Any], completion: @escaping (_ ret: Codable) -> ()) {
let semaphore = DispatchSemaphore(value: 1)
semaphore.wait()
let db = Database()
let json: [String: Any] = ValueArray
let jsonData = try? JSONSerialization.data(withJSONObject: json)
var request = URLRequest(url: URL(string: db.GetServerURL() + Router)!)
request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")
request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Accept")
request.httpMethod = "POST"
request.httpBody = jsonData
URLSession.shared.dataTask(with: request) { (data, response, error) in
if error != nil {
print(error!.localizedDescription)
}
guard let data = data else { return }
do {
if(Tipo == "User") {
let value = try JSONDecoder().decode([UserStruct].self, from: data)
completion(value)
}
} catch let error {
print("Error JSON: ", error)
}
}.resume()
semaphore.signal()
}

Answer 1

您可以从Xcode菜单安装"网络链接调节器"：Open Developers Tools>More Developers Tools。此工具允许您在不同的网络条件下进行测试。

传递给URLSesssion.dataTask处理程序可能应将有关成功或失败的信息传递回调用方。现在，如果数据nil，它只是返回如果出现错误。考虑向处理程序添加除数据之外的额外值。例如，如果缺少数据，_ success: Bool可以传递false以防出错。

... completion: @escaping (_ success: Bool, _ ret: Codable) -> ()