我正在从 Firebase 读取数据，然后在 tableview 单元格中显示这些数据。还有一个存储在本地的文件，其中包含每个单元格的已读/未读状态。该文件包含 Firebase 中每个孩子的密钥，我将其与每个单元格中的数据相匹配。
基本上，如果单元格具有在文件中也找到的键，则该数据被用户视为“已读取”。但是，如果单元格具有在本地文件中没有等效项的密钥，则此数据被视为“未读”。
到目前为止，这完美无缺。然后我为每个单元格添加了两个滑动功能。先标记为已读，也标记为未读。当标记为“已读”时，滑动会调用一个函数，该函数将单元格的密钥写入本地文件。相反，当标记为“未读”时，滑动会调用另一个从本地文件中删除密钥的函数。这也很完美。
但是，在滑动时，我还必须更改单元格背景颜色以反映“已读”或“未读”。这会导致问题，因为重新加载单元格以供重用......在我的情况下，我在重新加载之前获得了 7 个单元格。
这意味着如果我有超过 7 个单元格，并且我将某些内容标记为“已读”，我最终会更改多个单元格的背景颜色。文件写入工作正常......只是背景颜色被复制了。
我将 editActionsForRowAt 函数中的颜色更改如下：
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
let Action2 = UITableViewRowAction(style: .default, title: "Mark Read", handler: { (action, indexPath) in
// 函数在设置颜色之前继续做一些事情...
if filteredMessageIDforSwipe.count == 0 {
let selectedCell = self.Nomination2TableView.cellForRow(at: indexPath) as! Nomination2TableViewCell
selectedCell.contentView.backgroundColor = UIColor(hexString: "#ffffff")
请注意，我没有选择一个单元格......而是滑动，然后尝试更改被滑动单元格的单元格背景颜色。
显然，我只希望我刷过的单元格改变颜色，而不是另一个单元格（如果我有超过 7 个单元格）。
谢谢！
N。
编辑：我已经按照下面的建议修改了 editActionsForRowAt，但没有效果。
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
selectedRowIndexForReadUnread = indexPath.row
let Action2 = UITableViewRowAction(style: .default, title: "Mark Read", handler: { (action, indexPath) in
if filteredMessageIDforSwipe.count == 0 && selectedRowIndexForReadUnread = indexPath.row {
let selectedCell = self.Nomination2TableView.cellForRow(at: indexPath) as! Nomination2TableViewCell
selectedCell.contentView.backgroundColor = UIColor(hexString: "#ffffff")
编辑：作为参考，这里是 editActionsForRowAt 函数... Action2 和 Action5 是相关的。
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
selectedRowIndexForReadUnread = indexPath.row
if tableView == self.Nomination2SearchTableView {
let Action1 = UITableViewRowAction(style: .default, title: "Select", handler: { (action, indexPath) in
self.Nomination2SearchTableView.isHidden = true
self.Nomination2TableView.isHidden = false
NominationState = "Active"
let SearchObject: Nomination2SearchModel
SearchObject = Nomination2SearchList[indexPath.row]
userIDStringforNominationSearch = SearchObject.UserIDString!
let FullName = SearchObject.Full_Name
self.FullNameLabel.isHidden = false
self.FullNameLabel.text = "Showing " + FullName! + "'s Shout Outs"
self.LoadDataFromNominationafterSearch()
self.ActiveButton.setTitleColor(.orange, for: .normal)
let banner = NotificationBanner(title: "Tip", subtitle: "Swipe to select a user.", style: .info)
banner.haptic = .none
banner.show()
//We are setting the editor mode to the opposite of what is displayed in the tableview, because EditorMode text is what is displayed when you swipe the cell.
// EditorMode = "Set to Complete"
})
return [Action1]
}
if tableView == self.Nomination2TableView{
if NominationState == "Active" {
let Action2 = UITableViewRowAction(style: .default, title: "Mark Read", handler: { (action, indexPath) in
let searchObject9: Nomination2Model
searchObject9 = Nomination2List[indexPath.row]
let messageIDKey = searchObject9.key
let filename = self.getDocumentsDirectory().appendingPathComponent("output.txt")
do {
let textStringFromFile = try String(contentsOf: filename, encoding: .utf8)
var result: [(messageID: String, readStatus: String)] = []
// var indexCount = result.count
let rows = textStringFromFile.components(separatedBy: "\n")
for row in rows {
let columns = row.components(separatedBy: ",")
result.append((columns[0], columns[1]))
}
filteredMessageIDforSwipe = result.filter { $0.messageID == (messageIDKey) }
}
catch{
}
if filteredMessageIDforSwipe.count == 0 {
let selectedCell = self.Nomination2TableView.cellForRow(at: indexPath) as! Nomination2TableViewCell
// let selectedCellForReadMessages:UITableViewCell = self.Nomination2TableView.cellForRow(at: indexPath)! as! Nomination2TableViewCell
selectedCell.contentView.backgroundColor = UIColor(hexString: "#ffffff")
// let myReadCell = self.Nomination2TableView.cellForRow(at: indexPath) as! Nomination2TableViewCell
// myReadCell.NominationNameLabel.textColor = UIColor.lightGray
// myReadCell.NominationTextLabel.textColor = UIColor.lightGray
let NominationObject: Nomination2Model
NominationObject = Nomination2List[indexPath.row]
nominationKeyForWhenCellSelected = NominationObject.key
self.writeFile()
// self.removeRowFromFile()
}
if filteredMessageIDforSwipe.count > 0 {
let alert = UIAlertController(title: "Failure",
message: "Shout-out is already read!",
preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default))
self.present(alert, animated: true, completion: nil)
}
})
let Action5 = UITableViewRowAction(style: .default, title: "Mark Unread", handler: { (action, indexPath) in
let searchObject9: Nomination2Model
searchObject9 = Nomination2List[indexPath.row]
let messageIDKey = searchObject9.key
let filename = self.getDocumentsDirectory().appendingPathComponent("output.txt")
do {
let textStringFromFile = try String(contentsOf: filename, encoding: .utf8)
var result: [(messageID: String, readStatus: String)] = []
// var indexCount = result.count
let rows = textStringFromFile.components(separatedBy: "\n")
for row in rows {
let columns = row.components(separatedBy: ",")
result.append((columns[0], columns[1]))
}
filteredMessageIDforSwipe = result.filter { $0.messageID == (messageIDKey) }
}
catch{
}
if filteredMessageIDforSwipe.count > 0 {
let selectedCell:UITableViewCell = tableView.cellForRow(at: indexPath)!
selectedCell.contentView.backgroundColor = UIColor(hexString: "#fcf0e5")
// let myCell = self.Nomination2TableView.cellForRow(at: indexPath) as! Nomination2TableViewCell
// myCell.NominationNameLabel.textColor = UIColor.orange
// myCell.NominationTextLabel.textColor = UIColor.black
let NominationObject: Nomination2Model
NominationObject = Nomination2List[indexPath.row]
nominationKeyForWhenCellSelected = NominationObject.key
// self.writeFile()
self.removeRowFromFile()
}
if filteredMessageIDforSwipe.count == 0 {
let alert = UIAlertController(title: "Failure",
message: "Shout-out is already unread!",
preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default))
self.present(alert, animated: true, completion: nil)
}
})
Action2.backgroundColor = UIColor.lightGray
Action5.backgroundColor = UIColor.blue
return[Action2, Action5]
}
if NominationState == "Approve"{
let Action3 = UITableViewRowAction(style: .default, title: NominationState, handler: { (action, indexPath) in
let searchObject9: Nomination2Model
searchObject9 = Nomination2List[indexPath.row]
ForName = searchObject9.ForName!
FromName = searchObject9.FromName!
ForWhat = searchObject9.ForWhat!
key = searchObject9.key!
ForUserID = searchObject9.ForUserID!
FromUserID = searchObject9.FromUserID!
PointsGifted = searchObject9.PointsGifted!
NominationText = searchObject9.NominationText!
ImageNameNominations = searchObject9.ImageNameString!
ImageURLNominations = searchObject9.ImageURL!
databaseReference = Database.database().reference()
databaseReference.child("Users").child(FromUserID).observeSingleEvent(of: DataEventType.value, with: { (snapshot) in
let value = snapshot.value as? NSDictionary
let CurrentPointsRedeemed = value?["Points_Redeemed"] as? Int
let CurrentPointsBalance = value? ["Points_Balance"] as? Int
let NewPointsRedeemed = CurrentPointsRedeemed! + PointsGifted
let NewPointsBalance = CurrentPointsBalance! - PointsGifted
if NewPointsBalance >= 0{
databaseReference.child("Users").child(FromUserID).updateChildValues(["Points_Redeemed": NewPointsRedeemed])
databaseReference.child("Users").child(FromUserID).updateChildValues(["Points_Balance": NewPointsBalance])
self.postToFirebase()
self.giftPoints()
self.pendingCount()
Nomination2List.remove(at: indexPath.row)
tableView.deleteRows(at: [indexPath], with: .fade)
}
if NewPointsBalance <= 0{
let alert = UIAlertController(title: "Nominations",
message: "Not Enough Points for approval",
preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default))
self.present(alert, animated: true, completion: nil)
}
})
})
Action3.backgroundColor = UIColor.blue
return[Action3]
}
//here
//Action2.backgroundColor = UIColor.blue
//return[Action2]
else{
return [UITableViewRowAction]()
}
}
else {
return [UITableViewRowAction]()
}
}