为什么我的UITableView不再起作用了？
此表一直有效，直到我添加了2个空单元格。
我不知道发生了什么，但现在我无法理解我错过了什么。
我发布了所有"SchedaVolontario.swift"代码，这样您就可以分析所有代码。
正如您所看到的，我使用tableView.dequeueReusableCell方法与indexPath构造函数。
// SchedaVolontario.swift
import UIKit
import Firebase
import FlexibleSteppedProgressBar
class SchedaVolontario: UIViewController, UITableViewDataSource, UITableViewDelegate, FlexibleSteppedProgressBarDelegate {
let userCalendar = Calendar.current
let requestedComponent: Set<Calendar.Component> = [.day,.hour,.minute,.second,.month]
var codvolontario : String?
var nome: String?
var cognome : String?
var sede : String?
var progetto : String?
var datainizioservizio : String?
var datafineservizio : String?
var spazio: String?
var licenze : String?
var malattie : String?
var monitoraggio_uno : String?
var monitoraggio_due : String?
var monitoraggio_tre : String?
var progressBar: FlexibleSteppedProgressBar!
var monitoraggiostep = 0
var maxIndex = -1
// dichiarazione tabella di riferimento
@IBOutlet weak var guestInfoTableView: UITableView!
//dichiarazione array celle
var guestInfoList: [String] = []
//dichiarazione array celle
var test: [String] = []
//Dichairazione variabili generali per l'esecuzione di routine di calcolo
var labName: UILabel?
override func viewDidLoad() {
super.viewDidLoad()
//aggiorna cella monitoraggio
ricalcolaCellaMonitoraggio()
//avvia funzione riempimento celle
populateGuestInfoList()
//configurazione countdown
Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(ricalcolaCellaCountdown), userInfo: nil, repeats: true)
//delegate and datasource
guestInfoTableView.delegate = self
guestInfoTableView.dataSource = self
}
//riempimento celle
func populateGuestInfoList() {
//Nome
if codvolontario != nil {
guestInfoList.append("")
}
//Cognome
if codvolontario != nil {
guestInfoList.append("")
}
//Codice volontario
if codvolontario != nil {
guestInfoList.append("Il mio Codice Volontario: \(codvolontario!)")
}
//void1
if codvolontario != nil {
guestInfoList.append("")
}
//Ente
if sede != nil {
guestInfoList.append("Dove svolgo il mio servizio civile:")
}
//Descrizione ente
if let sede = sede {
guestInfoList.append(sede)
}
//Progetto
if progetto != nil {
guestInfoList.append("Il mio progetto:")
}
//Descrizione titolo progetto
if let progetto = progetto {
guestInfoList.append(progetto)
}
//void2
if codvolontario != nil {
guestInfoList.append("")
}
//Tempo
if spazio == spazio {
guestInfoList.append("Quanto manca alla fine del mio progetto:")
}
//creazione cella vuota per il countdown
if spazio == spazio {
guestInfoList.append("")
}
//Data inizio
if let datainizioservizio = datainizioservizio {
guestInfoList.append("\(datainizioservizio)")
}
//Data fine
if let datafineservizio = datafineservizio {
guestInfoList.append("\(datafineservizio)")
}
//Monitoraggio
if monitoraggio_uno == monitoraggio_uno {
guestInfoList.append("")
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return guestInfoList.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
//Nome
if indexPath.row == 0 {
let nomecell = tableView.dequeueReusableCell(withIdentifier: "nomecell", for: indexPath)
var myMutableString = NSMutableAttributedString()
let myString: NSString = "Nome: \(nome!)" as NSString
myMutableString = NSMutableAttributedString(string: myString as String, attributes: [NSFontAttributeName:UIFont(name: "Arial", size: 18.0)!])
myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.red, range: NSRange(location:0,length:5))
// set label Attribute
labName?.attributedText = myMutableString
nomecell.textLabel?.font = UIFont.boldSystemFont(ofSize: 12)
nomecell.textLabel?.text = myString as String?
nomecell.textLabel?.attributedText = myMutableString
}
//Cognome
if indexPath.row == 1 {
let cognomecell = tableView.dequeueReusableCell(withIdentifier: "cognomecell", for: indexPath)
var myMutableString = NSMutableAttributedString()
let myString: NSString = "Cognome: \(cognome!)" as NSString
myMutableString = NSMutableAttributedString(string: myString as String, attributes: [NSFontAttributeName:UIFont(name: "Arial", size: 18.0)!])
myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.red, range: NSRange(location:0,length:8))
// set label Attribute
labName?.attributedText = myMutableString
cognomecell.textLabel?.text = myString as String?
cognomecell.textLabel?.attributedText = myMutableString
}
//codvolcell
if indexPath.row == 2 {
let codvolcell = tableView.dequeueReusableCell(withIdentifier: "codvolcell", for: indexPath)
var myMutableString = NSMutableAttributedString()
let myString: NSString = "Il mio Codice Volontario: \(codvolontario!)" as NSString
myMutableString = NSMutableAttributedString(string: myString as String, attributes: [NSFontAttributeName:UIFont(name: "Arial", size: 18.0)!])
myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.red, range: NSRange(location:0,length:25))
// set label Attribute
labName?.attributedText = myMutableString
codvolcell.textLabel?.text = myString as String?
codvolcell.textLabel?.attributedText = myMutableString
}
//distacco 1
if indexPath.row == 3 {
let voidcell = tableView.dequeueReusableCell(withIdentifier: "voidcell", for: indexPath)
voidcell.textLabel?.text = ""
}
//Ente
if indexPath.row == 4 {
let entecell = tableView.dequeueReusableCell(withIdentifier: "entecell", for: indexPath)
entecell.textLabel?.text = "Dove svolgo il mio servizio civile:"
let myFont: UIFont? = UIFont(name: "Arial", size: 18.0)
if let aFont = myFont {
entecell.textLabel?.font = aFont
entecell.textLabel?.textColor = UIColor.red
}
}
//Descrizione ente
if indexPath.row == 5 {
let sedecell = tableView.dequeueReusableCell(withIdentifier: "sedecell", for: indexPath)
sedecell.textLabel?.text = sede
let myFont: UIFont? = UIFont(name: "Arial", size: 18.0)
if let aFont = myFont {
sedecell.textLabel?.font = aFont
}
}
//Progetto
if indexPath.row == 6 {
let progettocell = tableView.dequeueReusableCell(withIdentifier: "progettocell", for: indexPath)
progettocell.textLabel?.text = "Il mio progetto:"
let myFont: UIFont? = UIFont(name: "Arial", size: 18.0)
if let aFont = myFont {
progettocell.textLabel?.font = aFont
progettocell.textLabel?.textColor = UIColor.red
}
}
//Descrizione titolo progetto
if indexPath.row == 7 {
let titolocell = tableView.dequeueReusableCell(withIdentifier: "titolocell", for: indexPath)
titolocell.textLabel?.text = progetto
let myFont: UIFont? = UIFont(name: "Arial", size: 18.0)
if let aFont = myFont {
titolocell.textLabel?.font = aFont
}
}
//distacco 2
if indexPath.row == 8 {
let voidcell2 = tableView.dequeueReusableCell(withIdentifier: "voidcell2", for: indexPath)
voidcell2.textLabel?.text = ""
}
//Tempo residuo alla fine del SC
if indexPath.row == 9 {
let tempocell = tableView.dequeueReusableCell(withIdentifier: "tempocell", for: indexPath)
tempocell.textLabel?.text = "Quanto manca alla fine del mio progetto:"
let myFont: UIFont? = UIFont(name: "Arial", size: 18.0)
if let aFont = myFont {
tempocell.textLabel?.font = aFont
tempocell.textLabel?.textColor = UIColor.red
}
}
//countdown
let countdowncell = tableView.dequeueReusableCell(withIdentifier: "countdowncell", for: indexPath)
if indexPath.row == 10 {
let countdowncell = tableView.dequeueReusableCell(withIdentifier: "countdowncell", for: indexPath)
countdowncell.textLabel?.text = calcolaCountdown()
}else{
countdowncell.textLabel?.text = guestInfoList[indexPath.row]
}
//Data inizio servizio civile
if indexPath.row == 11 {
let datainiziocell = tableView.dequeueReusableCell(withIdentifier: "datainiziocell", for: indexPath)
var myMutableString = NSMutableAttributedString()
let myString: NSString = "Data inizio del mio servizio civile: \(datainizioservizio!)" as NSString
myMutableString = NSMutableAttributedString(string: myString as String, attributes: [NSFontAttributeName:UIFont(name: "Arial", size: 18.0)!])
myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.red, range: NSRange(location:0,length:36))
// set label Attribute
labName?.attributedText = myMutableString
datainiziocell.textLabel?.font = UIFont.boldSystemFont(ofSize: 12)
datainiziocell.textLabel?.text = myString as String?
datainiziocell.textLabel?.attributedText = myMutableString
}
//Data fine servizio civile
if indexPath.row == 12 {
let datafinecell = tableView.dequeueReusableCell(withIdentifier: "datafinecell", for: indexPath)
var myMutableString = NSMutableAttributedString()
let myString: NSString = "Data fine del mio servizio civile: \(datafineservizio!)" as NSString
myMutableString = NSMutableAttributedString(string: myString as String, attributes: [NSFontAttributeName:UIFont(name: "Arial", size: 18.0)!])
myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.red, range: NSRange(location:0,length:34))
// set label Attribute
labName?.attributedText = myMutableString
datafinecell.textLabel?.text = myString as String?
datafinecell.textLabel?.attributedText = myMutableString
}
//Stampa Monitoraggio
if indexPath.row == 13 {
let monitoraggiocell = tableView.dequeueReusableCell(withIdentifier: "monitoraggiocell", for: indexPath)
if monitoraggio_tre == "OK" {
monitoraggiocell.textLabel?.text = "3° Monitoraggio disponibile"
let myFont: UIFont? = UIFont(name: "Arial", size: 18.0)
if let aFont = myFont {
monitoraggiocell.textLabel?.font = aFont
}
monitoraggiostep = 2
let myFirstButton = UIButton()
myFirstButton.setTitle(" ", for: .normal)
myFirstButton.setTitleColor(UIColor.blue, for: .normal)
myFirstButton.frame = CGRect(x: 345, y: 575, width: 10, height: 10)
myFirstButton.addTarget(self, action: #selector(self.pressed(sender:)), for: .touchUpInside)
self.view.addSubview(myFirstButton)
}
else {
if monitoraggio_due == "OK" {
monitoraggiocell.textLabel?.text = "2° Monitoraggio disponibile"
let myFont: UIFont? = UIFont(name: "Arial", size: 18.0)
if let aFont = myFont {
monitoraggiocell.textLabel?.font = aFont
}
monitoraggiostep = 1
let myFirstButton = UIButton()
myFirstButton.setTitle(" ", for: .normal)
myFirstButton.setTitleColor(UIColor.blue, for: .normal)
myFirstButton.frame = CGRect(x: 290, y: 575, width: 10, height: 10)
myFirstButton.addTarget(self, action: #selector(self.pressed(sender:)), for: .touchUpInside)
self.view.addSubview(myFirstButton)
}
else {
if monitoraggio_uno == "OK" {
monitoraggiocell.textLabel?.text = "1° Monitoraggio disponibile"
let myFont: UIFont? = UIFont(name: "Arial", size: 18.0)
if let aFont = myFont {
monitoraggiocell.textLabel?.font = aFont
}
monitoraggiostep = 0
let myFirstButton = UIButton()
myFirstButton.setTitle(" ", for: .normal)
myFirstButton.setTitleColor(UIColor.blue, for: .normal)
myFirstButton.frame = CGRect(x: 236, y: 575, width: 10, height: 10)
myFirstButton.addTarget(self, action: #selector(self.pressed(sender:)), for: .touchUpInside)
self.view.addSubview(myFirstButton)
}
else {
if monitoraggio_uno != "OK" {
monitoraggiocell.textLabel?.text = "Nessun monitoraggio disponibile"
let myFont: UIFont? = UIFont(name: "Arial", size: 18.0)
if let aFont = myFont {
monitoraggiocell.textLabel?.font = aFont
}
monitoraggiostep = 0
}
}
}
}
//Configurazioni grafiche
progressBar = FlexibleSteppedProgressBar()
progressBar.translatesAutoresizingMaskIntoConstraints = false
progressBar.numberOfPoints = 3
progressBar.lineHeight = 9
progressBar.radius = 15
progressBar.progressRadius = 25
progressBar.progressLineHeight = 3
progressBar.delegate = self
progressBar.useLastState = true
progressBar.selectedBackgoundColor = UIColor.green
progressBar.selectedOuterCircleStrokeColor = UIColor.red
progressBar.lastStateOuterCircleStrokeColor = UIColor.red
progressBar.centerLayerDarkBackgroundTextColor = UIColor.red
progressBar.currentSelectedCenterColor = UIColor.red
//imposta valore monitoraggio
progressBar.completedTillIndex = monitoraggiostep
progressBar.currentIndex = monitoraggiostep
//inserimento e posizionamento
progressBar.frame = CGRect(x: 230, y: 11, width: 130, height: 20)
monitoraggiocell.contentView.addSubview(progressBar)
}
return countdowncell
}
//Calcolo Countdown
func calcolaCountdown() -> String!
{
var test = ""
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd/MM/yy"
let startTime = Date()
let endTime = dateFormatter.date(from: datafineservizio!)
let timeDifference = userCalendar.dateComponents(requestedComponent, from: startTime, to: endTime!)
let dateLabelOutlet = "\(timeDifference.month!) Mesi \(timeDifference.day!) Giorni \(timeDifference.hour!) Ore \(timeDifference.minute!) Minuti \(timeDifference.second!) Secondi"
if timeDifference.second! < 0 {
test = "Servizio terminato"
}
else {
test = dateLabelOutlet
}
return test
}
func ricalcolaCellaCountdown(){
let indexPathCountdown = IndexPath(row: 10, section: 0)
guestInfoTableView.reloadRows(at: [indexPathCountdown], with: .none)
}
func ricalcolaCellaMonitoraggio(){
let indexPathCountdown = IndexPath(row: 13, section: 0)
guestInfoTableView.reloadRows(at: [indexPathCountdown], with: .none)
}
@objc func pressed(sender: UIButton!) {
guard let url = URL(string: "https://www.amesci.org/mobile/serviziocivile/monitoraggio.htm") else {
return //be safe
}
if #available(iOS 10.0, *) {
UIApplication.shared.open(url, options: [:], completionHandler: nil)
} else {
UIApplication.shared.openURL(url)
}
}
//Generazione Barra di caricamento del monitoraggio
func progressBar(_ progressBar: FlexibleSteppedProgressBar,
didSelectItemAtIndex index: Int) {
progressBar.currentIndex = index
if index > maxIndex {
maxIndex = index
progressBar.completedTillIndex = maxIndex
}
}
func progressBar(_ progressBar: FlexibleSteppedProgressBar,
canSelectItemAtIndex index: Int) -> Bool {
return false
}
//rinomina valore step monitoraggio
func progressBar(_ progressBar: FlexibleSteppedProgressBar,
textAtIndex index: Int, position: FlexibleSteppedProgressBarTextLocation) -> String {
if progressBar == self.progressBar {
if position == FlexibleSteppedProgressBarTextLocation.center {
switch index {
case 0: return "1"
case 1: return "2"
case 2: return "3"
default: return "0"
}
}
}
return ""
}
}
这是我的主要表格配置：
修改
这就是显示控制台：
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Attempted to dequeue multiple cells for the same index path, which is not allowed. If you really need to dequeue more cells than the table view is requesting, use the -dequeueReusableCellWithIdentifier: method (without an index path). Cell identifier: countdowncell, index path: <NSIndexPath: 0x604000038760> {length = 2, path = 0 - 0}'
修改
我在if/else声明中将每个单元格投入，因为Larme建议我这样做...结果是一样的。这里是片段和聊天记录，也许我还是不明白：
func tableView（_ tableView：UITableView，cellForRowAt indexPath：IndexPath） - ＆gt; UITableViewCell {
//Nome
if indexPath.row == 0 {
let nomecell = tableView.dequeueReusableCell(withIdentifier: "nomecell", for: indexPath)
var myMutableString = NSMutableAttributedString()
let myString: NSString = "Nome: \(nome!)" as NSString
myMutableString = NSMutableAttributedString(string: myString as String, attributes: [NSFontAttributeName:UIFont(name: "Arial", size: 18.0)!])
myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.red, range: NSRange(location:0,length:5))
// set label Attribute
labName?.attributedText = myMutableString
nomecell.textLabel?.font = UIFont.boldSystemFont(ofSize: 12)
nomecell.textLabel?.text = myString as String?
nomecell.textLabel?.attributedText = myMutableString
}
else {
//Cognome
if indexPath.row == 1 {
let cognomecell = tableView.dequeueReusableCell(withIdentifier: "cognomecell", for: indexPath)
var myMutableString = NSMutableAttributedString()
let myString: NSString = "Cognome: \(cognome!)" as NSString
myMutableString = NSMutableAttributedString(string: myString as String, attributes: [NSFontAttributeName:UIFont(name: "Arial", size: 18.0)!])
myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.red, range: NSRange(location:0,length:8))
// set label Attribute
labName?.attributedText = myMutableString
cognomecell.textLabel?.text = myString as String?
cognomecell.textLabel?.attributedText = myMutableString
}
else {
//codvolcell
if indexPath.row == 2 {
let codvolcell = tableView.dequeueReusableCell(withIdentifier: "codvolcell", for: indexPath)
var myMutableString = NSMutableAttributedString()
let myString: NSString = "Il mio Codice Volontario: \(codvolontario!)" as NSString
myMutableString = NSMutableAttributedString(string: myString as String, attributes: [NSFontAttributeName:UIFont(name: "Arial", size: 18.0)!])
myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.red, range: NSRange(location:0,length:25))
// set label Attribute
labName?.attributedText = myMutableString
codvolcell.textLabel?.text = myString as String?
codvolcell.textLabel?.attributedText = myMutableString
}
else {
...
monitoraggiocell.contentView.addSubview(progressBar)
}
}
}
}
}
}
}
}
}
}
}
}
}
let the_chosen_one = tableView.dequeueReusableCell(withIdentifier: "nomecell", for: indexPath)
return the_chosen_one
}
chatlog：
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Attempted to dequeue multiple cells for the same index path, which is not allowed. If you really need to dequeue more cells than the table view is requesting, use the -dequeueReusableCellWithIdentifier: method (without an index path). Cell identifier: nomecell, index path: <NSIndexPath: 0x6000008244e0> {length = 2, path = 0 - 0}'
修改
我通过重写所有表来解决问题。伙计们记住：永远保存项目的备份副本！这救了我：
显然我在Main.storyboard上设置了一个比代码声明的单元格更多的单元格。
2 个答案:
答案 0 :(得分：1)
您可能没有为您的表设置/分配数据源和委托。当数组guestInfoList有一些值/元素时，重新加载表。
试试这个，看看：
override func viewDidLoad() {
super.viewDidLoad()
//aggiorna cella monitoraggio
ricalcolaCellaMonitoraggio()
//avvia funzione riempimento celle
populateGuestInfoList()
//configurazione countdown
Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(ricalcolaCellaCountdown), userInfo: nil, repeats: true)
// delegate and datasource
guestInfoTableView.delegate = self
guestInfoTableView.dataSource = self
}
答案 1 :(得分：0)
尝试将其放入viewDidLoad()：
guestInfoTableView.dataSource = self
guestInfoTableView.delegate = self
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