添加和刪除單元格選擇視圖

Question

我有一個表格顯示每個單元格中的一些數據，當選中單元格時，它應該展開並顯示更多數據。我有代碼的基本知識，但是當單元格被選中時，數據不會顯示，直到選中另一個單元格。數據似乎在選中時自動複製到其他單元格中。我相信我只需要移動方法的調用，儘管認爲我已經嘗試了所有組合，但找不到解決方案。繼承人的代碼，我想事項：

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { 

    let answers = questions[indexPath.row].answers?.allObjects as! [Answer] 
    let cell = tableView.cellForRow(at: indexPath as IndexPath) as! CollectedDataTableViewCell 

    switch selectedIndexPath { 
    case nil: 
     cell.contentView.viewWithTag(indexPath.row + 1)?.removeFromSuperview() 
     selectedIndexPath = indexPath as NSIndexPath? 
    default: 
     if selectedIndexPath! as IndexPath == indexPath { 
      addAnswerViews(cell: cell, answers: answers, index: indexPath.row + 1) 
      selectedIndexPath = nil 
     } else { 
      cell.contentView.viewWithTag(indexPath.row + 1)?.removeFromSuperview() 
      selectedIndexPath = indexPath as NSIndexPath? 
     } 
    } 

    tableView.reloadRows(at: [indexPath as IndexPath], with: UITableViewRowAnimation.automatic) 

    self.tableView.scrollToRow(at: indexPath, at: .top, animated: true) 
} 

func addAnswerViews(cell: CollectedDataTableViewCell, answers: [Answer], index: Int) { 

    var extra = CGFloat(0) 
    var percentage: Double = 0 

    let percentFormatter = NumberFormatter() 

    percentFormatter.numberStyle = .percent 
    percentFormatter.multiplier = 100 
    percentFormatter.minimumFractionDigits = 1 
    percentFormatter.maximumFractionDigits = 2 

    answers.forEach { answer in 
     let height = self.height - 6 
     let width = cell.contentView.frame.width 
     let view = UIView(frame: CGRect(x: 0, y: height + extra, width: width, height: height)) 
     view.tag = index 

     let answerLabel = UILabel(frame: CGRect(x: 15, y: 0, width: width - 30, height: height/2)) 
     answerLabel.backgroundColor = .clear 
     answerLabel.adjustsFontSizeToFitWidth = true 
     answerLabel.text = answer.text 

     if answer.timesSelected == 0 || answer.timesSelectedCorrectly == 0 { 

      percentage = 0 
     } else { 

      percentage = Double(answer.timesSelectedCorrectly)/Double(answer.timesSelected) 
     } 

     var percentString = percentFormatter.string(from: NSNumber(value: percentage)) 
     if percentage == 1.0 { percentString = "100%"} 
     if percentage == 0.0 { percentString = "0%" } 

     let timesSelectedCorrectlyLabel = UILabel(frame: CGRect(x: 15, y: height/2, width: width/2 - 15, height: height/2)) 
     timesSelectedCorrectlyLabel.backgroundColor = .clear 
     timesSelectedCorrectlyLabel.adjustsFontSizeToFitWidth = true 
     timesSelectedCorrectlyLabel.text = "Times selected correctly: \(answer.timesSelectedCorrectly) - \(percentString!)" 

     let timesSelectedLabel = UILabel(frame: CGRect(x: width/2 - 15, y: height/2, width: width/2 - 15, height: height/2)) 
     timesSelectedLabel.backgroundColor = .clear 
     timesSelectedLabel.adjustsFontSizeToFitWidth = true 
     timesSelectedLabel.text = "Times selected: \(answer.timesSelected)" 

     view.addSubview(answerLabel) 
     view.addSubview(timesSelectedCorrectlyLabel) 
     view.addSubview(timesSelectedLabel) 

     cell.contentView.addSubview(view) 
     extra += height 
    } 
} 

Answer 1

修改您的didSelectRowAtIndexPath方法爲:)

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { 

    let answers = questions[indexPath.row].answers?.allObjects as! [Answer] 
    let cell = tableView.cellForRow(at: indexPath as IndexPath) as! CollectedDataTableViewCell 

    if self.previouslySelectedIndexPath != nil { 
     cell.contentView.viewWithTag(previouslySelectedIndexPath.row + 1)?.removeFromSuperview() 
    } 
    addAnswerViews(cell: cell, answers: answers, index: indexPath.row + 1) 

    if self.previouslySelectedIndexPath != nil { 
     tableView.reloadRows(at: [indexPath,self.previouslySelectedIndexPath], with: UITableViewRowAnimation.automatic) 
    } 
    else { 
     tableView.reloadRows(at: [indexPath as IndexPath], with: UITableViewRowAnimation.automatic) 
    } 
    self.previouslySelectedIndexPath = indexPath 
    self.tableView.scrollToRow(at: indexPath, at: .top, animated: true) 
}