[英]Can't reload UITableView
我正在嘗試設計View,以便在其中顯示與Firebase數據庫同步的元素。 每當數組中的元素更改時,它都會重復。 嘗試使用
self.tableView.reloadData()
但沒有任何變化。 也嘗試過
self.tableView.beginUpdates()
self.tableView.reloadRowsAtIndexPaths(NSArray.init(object: indexPath) as! [NSIndexPath], withRowAnimation: .Automatic)
self.tableView.endUpdates()
而且它沒有像以前那樣工作。 我嘗試使用功能在主線程中執行重新加載tableView失敗
performSelectorOnMainThread
我正在為你們發布我的代碼,以便有人可以幫助我。 我是iOS編程的新手,我不知道何時在tableView中重新加載數據。 即使閱讀了蘋果的文檔。
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let alert = UIAlertController(title: "Akcja", message: "Wybierz akcję", preferredStyle: .ActionSheet)
let changeFieldNumberAction = UIAlertAction(title: "Zmień numer boiska", style: .Default, handler: {(action) in
self.showAlertOfChangingFieldNumber(indexPath)
})
let sendToRefereeAction = UIAlertAction(title: "Wskaż sędziego", style: .Default, handler: {(action) in
//self.championshitTournamentMode = false
})
let cancelAction = UIAlertAction(title: "Anuluj", style: .Cancel, handler: nil)
alert.addAction(cancelAction)
alert.addAction(changeFieldNumberAction)
alert.addAction(sendToRefereeAction)
self.presentViewController(alert, animated: true, completion: nil)
}
func showAlertOfChangingFieldNumber(indexPath: NSIndexPath) {
let fieldNumberAlert = UIAlertController(title: "Numer boiska", message: "Wpisz numer boiska", preferredStyle: .Alert)
fieldNumberAlert.addTextFieldWithConfigurationHandler({(textField: UITextField!) -> Void in
textField.placeholder = "Numer boiska"
textField.keyboardType = UIKeyboardType.NumberPad
})
let saveAction = UIAlertAction(title: "Zapisz", style: .Default, handler: {(action) -> Void in
let fieldNumberTextField = fieldNumberAlert.textFields![0] as UITextField
let fieldNumber = Int(fieldNumberTextField.text!)
self.updateGameFieldNumber(fieldNumber!, indexPath: indexPath)
})
let cancelAction = UIAlertAction(title: "Anuluj", style: .Cancel, handler: nil)
fieldNumberAlert.addAction(cancelAction)
fieldNumberAlert.addAction(saveAction)
self.presentViewController(fieldNumberAlert, animated: true, completion: nil)
}
func updateGameFieldNumber(fieldNumber: Int, indexPath: NSIndexPath){
let gameKey = games[indexPath.row].key
let ref = FIRDatabase.database().reference().child("games").child(gameKey)
games[indexPath.row].fieldNumber = fieldNumber
ref.updateChildValues(games[indexPath.row].toAnyObject() as! [NSObject : AnyObject])
//self.games.removeAtIndex(indexPath.row+1)
self.tableView.beginUpdates()
self.tableView.reloadRowsAtIndexPaths(NSArray.init(object: indexPath) as! [NSIndexPath], withRowAnimation: .Automatic)
self.tableView.endUpdates()
}
我的tableView委托函數和基於Firebase數據庫填充數組的函數如下所示:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! GameViewCellTableViewCell
if games[indexPath.row].fieldNumber == 0 {
cell.fieldNumberLabel.text = "-"
} else {
cell.fieldNumberLabel.text = String(games[indexPath.row].fieldNumber)
}
cell.firstParticipantLabel.text = games[indexPath.row].firstParticipant
cell.secondParticipantLabel.text = games[indexPath.row].secondParticipant
cell.gameImage.image = UIImage(named: "tenisBall")
if games[indexPath.row].completed != true {
cell.backgroundColor = UIColor.init(red: 1, green: 109.0/255, blue: 95.0/255, alpha: 1)
} else {
cell.backgroundColor = UIColor.init(red: 160/255, green: 1, blue: 86/255, alpha: 1)
}
return cell
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.games.count
}
func getGames() {
let ref = FIRDatabase.database().reference().child("games")
ref.observeEventType(.Value, withBlock: {snapshot in
for item in snapshot.children {
let gameItem = GameItem(snapshot: item as! FIRDataSnapshot)
if(gameItem.tournamentName == self.tournamentName) {
self.games.append(gameItem)
}
}
self.tableView.reloadData()
})
}
它會重復,因為您沒有更新“游戲”數組中的值,而是將修改后的值附加到數組中。 這發生在“ getgames()”方法中。
在 - 的里面
func getGames()
后
self.games.append(gameItem)
dispatch_async(dispatch_get_main_queue(), {
self.tableView.reloadData()
})
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