UIView不圆形，UITableView细胞回收

Question

我有一个UIView在一个UITableView的单元格内。我的cellForRowAtIndexPath四舍五入该视图。当我打开视图控制器并查看表格时，所有可见视图都被舍入。但是，当我向下滚动时，出现的第一个新单元格不具有圆角视图。我如何解决它？

我cellForRowAtIndex看起来是这样的：

let cell = tableView.dequeueReusableCell(withIdentifier: "RepeatingCell", for: indexPath) as! CustomTableViewCell 
cell.delegate = self 
tableView.contentInset = UIEdgeInsetsMake(10, 0, 0, 0) 

if (indexPath as NSIndexPath).row < tableListInfo_Context.count { 
    let task = tableListInfo_Context[(indexPath as NSIndexPath).row     
    let accState = task.value(forKey: "state") as? String 
    //Removed assigning labels their text 
    let mainView = cell.mainView 
    mainView.isHidden = false 
    let circleView = cell.viewToRound 
    circleView?.isHidden = false 
    circleView?.layer.cornerRadius = (circleView?.frame.size.width)!/2 
    circleView?.layer.masksToBounds = true   
    cell.layoutMargins = UIEdgeInsetsMake(0, 1000, 0, 1000) 
} else { 
    //My last cell hides several views to reveal a view under them 
    //If I comment this one line out, I get the not-rounded problem only once and it does not show up again even if I continue scrolling up/down 
    let mainView = cell.mainView 
    mainView.isHidden = true 
    let circleView = cell.viewToRound 
    circleView?.isHidden = true 
} 

我明白UITableViews回收细胞，我认为这很可能导致我的问题。我认为这与我隐藏视图的最后一个单元格有关。

在20个单元格的列表中，有时非圆角视图显示为第一个在屏幕上滚动，有时是第二个。随着我向上/向下滚动，随机地观看视频不会变圆！我知道有一个原因/模式，但我不知道是什么。

我也尝试添加舍入代码willDisplayCell：

let circleView = myCell.mainCircle 
circleView?.layer.cornerRadius = (circleView?.frame.size.width)!/2 
circleView?.layer.masksToBounds = true 

然而，这并没有解决这个问题。这是多么不协调令人非常沮丧。任何帮助，将不胜感激。

全码的要求邓肯：

func buildCell_RepeatableCell (indexPath: IndexPath) -> CustomTableViewCell   { 
    let cell = tableView.dequeueReusableCell(withIdentifier: "RepeatingCell",  for: indexPath) as! CustomTableViewCell 
    cell.delegate = self 

    tableToSV_Left.constant = 10 
    tableToSV_Right.constant = 10 
    tableView.contentInset = UIEdgeInsetsMake(10, 0, 0, 0) 

    if (indexPath as NSIndexPath).row < curLifeList_Context.count { 
     resetDataCell_ToDefaultLaylout(cell: cell, hideExpand: true) 
     let task = curLifeList_Context[(indexPath as NSIndexPath).row] 
     let accState = task.value(forKey: "state") as? String 
     cell.nameLabel!.text = task.value(forKey: "name") as? String 
     cell.descLabel!.text = task.value(forKey: "desc") as? String 
     let redTrashIcon = UIImage(named: "trash") 
     let maskedIcon = redTrashIcon?.maskWithColor(color: .red) 
     cell.row5_LeftBtnImg?.image = maskedIcon 
     let doneGreen = UIColor(colorLiteralRed: 83/255, green: 223/255, blue: 56/225, alpha: 0.9) 
     let greenCheck = UIImage(named: "check_Green") 
     let maskedCheck = greenCheck?.maskWithColor(color: doneGreen) 
     cell.row5_RightBtnImg?.image = maskedCheck 
     roundQtyCircle(view: cell.mainCircle) 
     if accState == "Selected" { 
      cell.circleLine.backgroundColor = doneGreen 
      cell.mainCircle.borderColor = doneGreen 
      cell.hdrCrossOutLine.isHidden = false 
      cell.row5_RightBtnImg.alpha = 0.5 
     } else { 
      cell.circleLine.backgroundColor = UIColor(colorLiteralRed: 211/255, green: 211/255, blue: 211/255, alpha: 0.9) 
      cell.mainCircle.borderColor = UIColor(colorLiteralRed: 211/255, green: 211/255, blue: 211/255, alpha: 0.9) 
      cell.hdrCrossOutLine.isHidden = true 
      cell.row5_RightBtnImg.alpha = 1.0 
     } 
     cell.dataHdr_Left!.text = doneColon_lczd 
     cell.dataHdr_Right!.text = lastDoneColon_lczd 
     cell.dataVal_Left!.text = "0" 
     cell.dataVal_Right!.text = "-" 
     if let lastCompDate = task.value(forKey: "lastCompleted") as? Date { 
      cell.dataVal_Left!.text = "\(task.value(forKey: "timesCompleted") as! Int)" 
      if NSCalendar.current.isDateInToday(lastCompDate) { 
       cell.dataVal_Right!.text = "Today" 
       cell.dataBotDtl_Right.text = "" 
      } else { 
       let secondsUntilChange = (lastCompDate.seconds(from: now)) * -1 
       print("Seconds ago \(secondsUntilChange)") 
       var timeAgo = getDateString(secondsUntilChange, resetDate: lastCompDate) 
       timeAgo.remove(at: timeAgo.startIndex) 
       cell.dataVal_Right!.text = timeAgo 
      } 
     } 
     cell.layoutMargins = UIEdgeInsetsMake(0, 1000, 0, 1000) 
    } else { 
     buildAddNew_ForRepeatableCell(cell: cell) 
    } 

    return cell 
    } 

    func resetDataCell_ToDefaultLaylout (cell: CustomTableViewCell, hideExpand: Bool) { 
    cell.addnewBtn.isHidden = true 
    cell.nameLabel.isHidden = false 
    cell.dataHdr_Left.isHidden = false 
    cell.dataHdr_Right.isHidden = false 
    cell.dataTopDtl_Right.isHidden = false 
    cell.dataBotDtl_Right.isHidden = false 
    cell.mainBox.isHidden = false 
} 

func buildAddNew_ForRepeatableCell (cell: CustomTableViewCell) { 
    cell.addnewBtn.isHidden = false 
    cell.descLabel.text = addNew_lczd //For editor 
    cell.mainBox.isHidden = true 
    cell.layoutMargins = UIEdgeInsetsMake(0, 1000, 0, 1000) 
    cell.container.layoutIfNeeded() 
} 

Answer 1

而是在cellForRowAtIndexPath设置视图的图层属性的，在你的CustomTableViewCell类设置。您可以在awakeFromNib方法中设置它们。

总之把你的下面的代码移到awakeFromNib。

let circleView = cell.viewToRound 
    circleView?.layer.cornerRadius = (circleView?.frame.size.width)!/2 
    circleView?.layer.masksToBounds = true 

须藤代码可能是这样的：

awakeFromNib(){ 
self.viewToRound?.layer.cornerRadius = (viewToRound?.frame.size.width)!/2 
viewToRound?.layer.masksToBounds = true 

} 

Answer 2

试试这个，它会工作。

override func awakeFromNib() { 
     super.awakeFromNib() 
     self.viewToRound?.layer.cornerRadius = (viewToRound?.frame.size.width)!/2 
     viewToRound?.layer.masksToBounds = true 
    } 


override func prepareForReuse() { 
     super.prepareForReuse() 
     self.viewToRound?.layer.cornerRadius = (viewToRound?.frame.size.width)!/2 
     viewToRound?.layer.masksToBounds = true 
    } 

Answer 3

@Adeel已经告诉过你他的评论中的问题和解决方案。

你总是需要在每种情况下完全配置你的单元格。请记住，当您获得再生细胞时，它可能处于任何可能的剩余状态。

在你的情况，关键位：

if (indexPath as NSIndexPath).row < tableListInfo_Context.count { 
    //Configure cells that are not the last cell 
} else { 
    //Configure cells the last cell 
    mainView.isHidden = true 
} 

你隐藏在您正在配置的最后一个单元格的情况下mainView，但不取消隐藏它，如果它不是最后一个单元格。因此，如果您配置最后一个单元格，请将其滚动到屏幕外，然后向屏幕顶部滚动，再循环单元格将被重用，而不是最后一个单元格的indexPath，并且它的mainView将永远不会被隐藏。

if (indexPath as NSIndexPath).row < tableListInfo_Context.count { 
    //Configure cells that are not the last cell 
    //----------------------------- 
    // This is what you are missing 
    mainView.isHidden = false 
    //----------------------------- 
} else { 
    //Configure cells the last cell 
    mainView.isHidden = true 
} 

@ VishalSonawane的回答是好，但要作出这样的工作，你应该使用2个不同的标识符，一个对所有细胞，但最后一个，和不同的标识符，用细胞预先配置MAINVIEW隐藏，为最后一个单元格。这样你不会得到一个循环的最后一个单元格，并尝试将它用于表格视图中的其他位置之一。