我只是想知道如何在firebase中通过.observeEventType更新我的显示数据 - 以及我拥有的一系列字典。我有一个表视图，带有删除按钮功能。但是，我只能从firebase中删除值，而不是字典数组。我在viewDidLoad中有observeEventType，得到我的数据：
var dict = [String:String]()
dict["data"] = snapshot.value!["data"] as? String
array.append(dict)
但是，在numberOfRowsInSection中我有array.count，我得到一个错误，计数错误。我该如何解决这个问题？从字典数组中删除值，完整地查看整个数据并显示新数据，或者我该怎么办？
顺便说一句：当应用程序崩溃，我再次构建它时 - 删除的值已经消失，数据显示正常 - 但是，我只想让删除部分顺利运行。提前致谢。
整个代码：
func LoadValues() {
var curID = FIRAuth.auth()?.currentUser?.uid
ref.child("Users").child(curID!).child("Prices").observeEventType(.Value) { (snapshot:FIRDataSnapshot) in
if let PermPrice = snapshot.value!["PermanentPrice"] as? Int {
self.dict2["PermanentPrice"] = String(PermPrice)
}
if let Price24 = snapshot.value!["24hours"] as? Int {
self.dict2["24hours"] = String(Price24)
}
if let Price12 = snapshot.value!["12hours"] as? Int {
self.dict2["12hours"] = String(Price12)
}
if let Price6 = snapshot.value!["6hours"] as? Int {
self.dict2["6hours"] = String(Price6)
}
if let Price2 = snapshot.value!["2hours"] as? Int {
self.dict2["2hours"] = String(Price2)
}
self.allTiers.append(self.dict2)
}
}
上面的代码是一个价格层系统，允许用户在5个不同的价格层之间进行选择。它显示在表格视图中。
这将显示在tableview中：
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
if indexPath.row == 0 {
let cell1 = tableView.dequeueReusableCellWithIdentifier("firstCell", forIndexPath: indexPath) as! TierCell1
cell1.deleteButton1.tag = 0
cell1.deleteButton1.addTarget(self, action: "DeleteTier:", forControlEvents: .TouchUpInside)
//let cell1 = tableView.dequeueReusableCellWithIdentifier("firstCell", forIndexPath: indexPath) as! TierCell1
//set the data here
if allTiers[0]["PermanentPrice"] != nil {
cell1.price1.text = "$" + String(allTiers[0]["PermanentPrice"]!)
cell1.text1.text = "Permanent"
PermTextTier = true
} else if allTiers[0]["24hours"] != nil {
cell1.price1.text = "$" + String(allTiers[0]["24hours"]!)
cell1.text1.text = "24 hours"
TextTier24 = true
} else if allTiers[0]["12hours"] != nil {
cell1.price1.text = "$" + String(allTiers[0]["12hours"]!)
cell1.text1.text = "12 hours"
TextTier12 = true
} else if allTiers[0]["6hours"] != nil {
cell1.price1.text = "$" + String(allTiers[0]["6hours"]!)
cell1.text1.text = "6 hours"
TextTier6 = true
} else if allTiers[0]["2hours"] != nil {
cell1.price1.text = "$" + String(allTiers[0]["2hours"]!)
cell1.text1.text = "2 hours"
TextTier2 = true
}
//cell1.text1.text = String(allTiers[0]["PermanentPrice"]!)
return cell1
}
if indexPath.row == 1 {
//let cell2: TierCell2 = TierCell2(style: UITableViewCellStyle.Default, reuseIdentifier: "secondCell") as! TierCell2
//set the data here
let cell2 = tableView.dequeueReusableCellWithIdentifier("secondCell", forIndexPath: indexPath) as! TierCell2
cell2.deleteButton2.tag = 1
cell2.deleteButton2.addTarget(self, action: "DeleteTier:", forControlEvents: .TouchUpInside)
if allTiers[0]["24hours"] != nil && TextTier24 == false {
cell2.price2.text = "$" + String(allTiers[0]["24hours"]!)
cell2.text2.text = "24 hours"
TextTier24 = true
} else if allTiers[0]["12hours"] != nil && TextTier12 == false {
cell2.price2.text = "$" + String(allTiers[0]["12hours"]!)
cell2.text2.text = "12 hours"
TextTier12 = true
} else if allTiers[0]["6hours"] != nil && TextTier6 == false {
cell2.price2.text = "$" + String(allTiers[0]["6hours"]!)
cell2.text2.text = "6 hours"
TextTier6 = true
} else if allTiers[0]["2hours"] != nil && TextTier2 == false {
cell2.price2.text = "$" + String(allTiers[0]["2hours"]!)
cell2.text2.text = "2 hours"
TextTier2 = true
}
return cell2
}
if indexPath.row == 2 {
//let cell2: TierCell2 = TierCell2(style: UITableViewCellStyle.Default, reuseIdentifier: "secondCell") as! TierCell2
//set the data here
let cell3 = tableView.dequeueReusableCellWithIdentifier("thirdCell", forIndexPath: indexPath) as! TierCell3
cell3.deleteButton3.tag = 2
cell3.deleteButton3.addTarget(self, action: "DeleteTier:", forControlEvents: .TouchUpInside)
if allTiers[0]["12hours"] != nil && TextTier12 == false {
cell3.price3.text = "$" + String(allTiers[0]["12hours"]!)
cell3.text3.text = "12 hours"
TextTier12 = true
} else if allTiers[0]["6hours"] != nil && TextTier6 == false {
cell3.price3.text = "$" + String(allTiers[0]["6hours"]!)
cell3.text3.text = "6 hours"
TextTier6 = true
} else if allTiers[0]["2hours"] != nil && TextTier2 == false {
cell3.price3.text = "$" + String(allTiers[0]["2hours"]!)
cell3.text3.text = "2 hours"
TextTier2 = true
}
return cell3
}
if indexPath.row == 3 {
//let cell2: TierCell2 = TierCell2(style: UITableViewCellStyle.Default, reuseIdentifier: "secondCell") as! TierCell2
//set the data here
let cell4 = tableView.dequeueReusableCellWithIdentifier("fourthCell", forIndexPath: indexPath) as! TierCell4
cell4.deleteButton4.tag = 3
cell4.deleteButton4.addTarget(self, action: "DeleteTier:", forControlEvents: .TouchUpInside)
if allTiers[0]["6hours"] != nil && TextTier6 == false {
cell4.price4.text = "$" + String(allTiers[0]["6hours"]!)
cell4.text4.text = "6 hours"
TextTier6 = true
} else if allTiers[0]["2hours"] != nil && TextTier2 == false {
cell4.price4.text = "$" + String(allTiers[0]["2hours"]!)
cell4.text4.text = "2 hours"
TextTier2 = true
}
return cell4
}
if indexPath.row == 4 {
//let cell2: TierCell2 = TierCell2(style: UITableViewCellStyle.Default, reuseIdentifier: "secondCell") as! TierCell2
//set the data here
let cell5 = tableView.dequeueReusableCellWithIdentifier("fifthCell", forIndexPath: indexPath) as! TierCell5
cell5.deleteButton5.tag = 4
cell5.deleteButton5.addTarget(self, action: "DeleteTier:", forControlEvents: .TouchUpInside)
if allTiers[0]["2hours"] != nil && TextTier2 == false {
cell5.price5.text = "$" + String(allTiers[0]["2hours"]!)
cell5.text5.text = "2 hours"
TextTier2 = true
}
return cell5
} else {
let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "none")
return cell
}
}
此代码看起来相当混乱，但我只想在任何时候在顶部显示最高价格等级。删除值时，这不会更新。
答案 0 :(得分：0)
您的代码存在一些设计问题，我将开始在您的案例中寻找更好的方法来处理TableView。所以，记住它。
使用您当前的TableView代码，如果我没有错过任何内容，那么为了实现您正在寻找的内容，您应该如何检索数据：
func LoadValues() {
var curID = FIRAuth.auth()?.currentUser?.uid
ref.child("Users").child(curID!).child("Prices").observeEventType(.Value, withBlock: { snapshot in
if let PermPrice = snapshot.value!["PermanentPrice"] as? Int {
self.dict2["PermanentPrice"] = String(PermPrice)
}
if let Price24 = snapshot.value!["24hours"] as? Int {
self.dict2["24hours"] = String(Price24)
}
if let Price12 = snapshot.value!["12hours"] as? Int {
self.dict2["12hours"] = String(Price12)
}
if let Price6 = snapshot.value!["6hours"] as? Int {
self.dict2["6hours"] = String(Price6)
}
if let Price2 = snapshot.value!["2hours"] as? Int {
self.dict2["2hours"] = String(Price2)
}
self.allTiers.removeAll()
self.allTiers.append(self.dict2)
}
}