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在我的應用程序中，有一個添加按鈕，單擊時會添加一個新的tableviewcell。但問題是我第一次獲得重複的單元格。從本質上講，當我點擊第二次時，我得到2個副本，第三個3等....請參閱圖像的屏幕截圖： 
第一次獲取重複的tableview單元格
上面的圖像是第一個屏幕。點擊「+」將增加一個新的細胞，它看起來像下面的圖片：在保存後 
現在， 
現在，如果我走了這一觀點，並回來，再次單擊添加和創建一個新的單元格，它給了我上面段落中提到的重複內容（即，第二次是2，第三次是3，等等）。 下面是截圖：
這裏是我使用的代碼：
@IBAction func addBasket(_ sender: UIButton) {
let prefs = UserDefaults.standard
let status = prefs.string(forKey: "status")
if(status != nil){
if(status == "pending"){
if(BasketItemList.count < 5) {
self.addpost()
} else {
let alert = SCLAlertView()
alert.showWarning("Basket", subTitle: "Upgrade to add more")
}
} else {
if(BasketItemList.count < 50) {
self.addpost()
} else {
let alert = SCLAlertView()
alert.showWarning("Basket", subTitle: "Upgrade to add more")
}
}
}
}
func addpost() {
let appearance = SCLAlertView.SCLAppearance(
showCloseButton: false
)
let alert = SCLAlertView(appearance : appearance)
let txt = alert.addTextField("Enter name")
alert.addButton("Save") {
if txt.text?.characters.count != 0 {
let basketname : String = txt.text!
let userID = FIRAuth.auth()?.currentUser?.uid
let postitem : [String :AnyObject] = ["userid" : userID! as AnyObject , "basketname" : basketname as AnyObject ]
let dbref = FIRDatabase.database().reference()
dbref.child("BasketList").childByAutoId().setValue(postitem)
self.Basketdata2()
let appearance = SCLAlertView.SCLAppearance(
kDefaultShadowOpacity: 0,
showCloseButton: false
)
let alertView = SCLAlertView(appearance: appearance)
alertView.showTitle(
"Saved", // Title of view
subTitle: "", // String of view
duration: 2.0, // Duration to show before closing automatically, default: 0.0
completeText: "Done", // Optional button value, default: ""
style: .success, // Styles - see below.
colorStyle: 0xA429FF,
colorTextButton: 0xFFFFFF
)
} else {
let alert = SCLAlertView()
alert.showError("Oops!", subTitle: "Basket name should not be empty")
self.tableviewbasket.reloadData()
}
}
alert.addButton("Cancel"){
}
alert.showEdit("Add basket", subTitle: "Please enter your basket name")
}
func Basketdata2() {
HUD.show(.labeledProgress(title: "Loading...", subtitle: ""))
let databaseref = FIRDatabase.database().reference()
var userID = FIRAuth.auth()?.currentUser?.uid
if userID == nil {
userID = userfbid
}
databaseref.child("BasketList").queryOrdered(byChild: "userid").queryEqual(toValue: userID!).observeSingleEvent(of: .value, with: { (snapshot) in
if snapshot.exists() {
self.tableviewbasket.backgroundView = nil;
HUD.hide()
} else {
HUD.hide()
self.tableviewbasket.setContentOffset(CGPoint(x : 0, y: -98), animated: true)
if (self.BasketItemList.count == 0) {
// tableView is empty. You can set a backgroundView for it.
let label = UILabel(frame: CGRect(x: 5, y: 0, width: self.tableviewbasket.bounds.size.width, height:self.tableviewbasket.bounds.size.height))
label.text = "The best preparation for tomorrow \n is doing your best today.\n Please create your first basket."
label.textColor = UIColor.black;
label.textAlignment = .center
label.numberOfLines = 4
label.sizeToFit()
label.font = UIFont(name: "AvenirNext-Regular", size: 16.0)
self.tableviewbasket.backgroundView = label;
self.tableviewbasket.separatorStyle = .none;
}
}
})
}
func Basketdata() {
HUD.show(.labeledProgress(title: "Please wait...", subtitle: ""))
self.BasketItemList.removeAll()
self.Basketid.removeAll()
let databaseref = FIRDatabase.database().reference()
let userID = FIRAuth.auth()?.currentUser?.uid
databaseref.child("BasketList").queryOrdered(byChild: "userid").queryEqual(toValue: userID!).observeSingleEvent(of: .value, with: { (snapshot) in
if snapshot.exists() {
databaseref.child("BasketList").queryOrdered(byChild: "userid").queryEqual(toValue: userID!).observe(.childAdded, with: {
(snapshot) in
if let dictionary = snapshot.value as? [String : AnyObject] {
let basketitem = BasketList(text : "")
basketitem.setValuesForKeys(dictionary)
self.BasketItemList.append(basketitem)
self.Basketid.append(snapshot.key)
DispatchQueue.main.async {
if !self.BasketItemList.isEmpty {
HUD.hide()
self.tableviewbasket.reloadData()
}
}
} else {
self.tableviewbasket.reloadData()
HUD.hide()
}
})
} else {
if (self.BasketItemList.count == 0) {
// tableView is empty. You can set a backgroundView for it.
let label = UILabel(frame: CGRect(x: 5, y: 0, width: self.tableviewbasket.bounds.size.width, height:self.tableviewbasket.bounds.size.height))
label.text = "The best preparation for tomorrow \nis doing your best today"
label.textColor = UIColor.black;
label.textAlignment = .center
label.numberOfLines = 2
label.sizeToFit()
label.font = UIFont(name: "AvenirNext-Regular", size: 16.0)
self.tableviewbasket.backgroundView = label;
self.tableviewbasket.separatorStyle = .none;
}
HUD.hide()
}
})
}
有人可以幫助我瞭解什麼是錯我的代碼？謝謝！
編輯：我已經提到這個線程沒有任何的運氣：Getting duplicate cells with UITableViewController cellForRowAtIndexPath
編輯2：此外，當我走出這一觀點的，去了同樣的觀點，重複的值vansihed。
編輯3：沒有任何成功試過答案。
添加警報顯示警告確定操作。 –
您的Firebase數據庫可以嗎？ –
是的，firebase數據庫工作正常。 – BizDev