如何避免tableview单元的可重用性？

Question

当我点击选择按钮indexpath.row == 0或任何所以,只能用相应的"会话标签值"会改变,但这里不会发生.它会改变下面的单元格值,即indexpath == 7或8,我认为这里是单元格的重用,所以我怎么能避免它.

我的代码如下.

1.UITableViewCell类:

import UIKit

class DemoTableViewCell: UITableViewCell {


    @IBOutlet weak var mSelectButton: UIButton!
    @IBOutlet weak var mDateLabel: UILabel!
    @IBOutlet weak var mSessionLabel: UILabel!    

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }
}

1. ViewController类: -

   导入UIKit

       class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
   
           var month_year = ""
           var fromYear = ""
           var toYear = ""
           var monthYearList = ""
           var monthYearListArray = [String]()
           let picker : UIDatePicker = UIDatePicker()
   
           var from_date = ""
           var to_date = ""
   
           //
           var selectedTagValue = Int()
           var aSheetValue = ""
           var isFromActionSheet = Bool()
           var isFromFinalClick = Bool()
           var intArray = [Int]()
   
           @IBOutlet weak var mTableView: UITableView!
   
           // MARK:- ViewController Life Cycle Methods
   
           override func viewDidLoad() {
               super.viewDidLoad()
           }
   
           override func viewWillAppear(_ animated: Bool) {
               self.printDatesBetweenInterval(self.dateFromString("2017-07-01"), self.dateFromString("2017-07-12"))
           }
   
           //MARK:- UITableViewDataSource and Delegate Methods
   
           func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
   
               return monthYearListArray.count
           }
   
           func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
   
               let cell = tableView.dequeueReusableCell(withIdentifier: "DemoTableViewCell")! as! DemoTableViewCell
   
               cell.mDateLabel.text = monthYearListArray[indexPath.row]
   
               if isFromActionSheet{
   
                   if indexPath.row == selectedTagValue{
                       cell.mSessionLabel.text = aSheetValue
                       isFromActionSheet = false
                   }
               }
   
               cell.mSelectButton.tag = indexPath.row
               print("cell.mButtonOutlet.tag: \(cell.mSelectButton.tag)")
   
               cell.mSelectButton.addTarget(self, action: #selector(ViewController.actionOnSelectButtonClick(_:)), for: .touchUpInside)
   
               if isFromFinalClick{
                   if cell.mSessionLabel.text == "Full Day"{
                       self.intArray.append(1)
   
                   }else if cell.mSessionLabel.text == "First Half"{
                       self.intArray.append(2)
                   }else{
                       self.intArray.append(3)
                   }
               }
   
               return cell
           }
   
   
           // MARK:- IBAction Methods
   
           func actionOnSelectButtonClick(_ sender: UIButton)  {
               let mButton : UIButton = sender
               selectedTagValue = mButton.tag
               print("selectedTagValue: \(selectedTagValue)")
               isFromActionSheet = true
               openActionSheet()
           }
   
           // Submit Button
   
           @IBAction func actionOnSubmitButton(_ sender: Any) {
               isFromFinalClick = true
               mTableView.reloadData()
               print("intArray list: \(intArray)")
   
           }
   
           // MARK:- Instance Methods
   
           func openActionSheet()  {
   
               // 1
               let optionMenu = UIAlertController(title: nil, message: "Select Session", preferredStyle: .actionSheet)
   
               // 2
               let fullDayAction = UIAlertAction(title: "Full Day", style: .default, handler: {
                   (alert: UIAlertAction!) -> Void in
                   print("Full Day")
                   self.aSheetValue = "Full Day"
                   self.mTableView.reloadData()
               })
   
               let firstHalfAction = UIAlertAction(title: "First Half", style: .default, handler: {
                   (alert: UIAlertAction!) -> Void in
                   print("First Half")
                   self.aSheetValue = "First Half"
                   self.mTableView.reloadData()
   
               })
               let secondHalfAction = UIAlertAction(title: "Second Half", style: .default, handler: {
                   (alert: UIAlertAction!) -> Void in
                   print("Second Half")
                   self.aSheetValue = "Second Half"
                   self.mTableView.reloadData()
   
               })
   
               //
               let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: {
                   (alert: UIAlertAction!) -> Void in
                   print("Cancelled")
               })
   
               // 4
               optionMenu.addAction(fullDayAction)
               optionMenu.addAction(firstHalfAction)
               optionMenu.addAction(secondHalfAction)
               optionMenu.addAction(cancelAction)
   
   
               // 5
               self.present(optionMenu, animated: true, completion: nil)
           }
   
   
           // MARK:- Date_List Method
   
           func printDatesBetweenInterval(_ startDate: Date, _ endDate: Date) {
               var startDate = startDate
               let calendar = Calendar.current
   
               let fmt = DateFormatter()
               fmt.dateFormat = "yyyy-MM-dd"
   
               while startDate <= endDate {
                   print(fmt.string(from: startDate))
                   self.monthYearList = fmt.string(from: startDate)
                   print("self.monthYearList: \(self.monthYearList)")
                   fmt.dateFormat = "yyyy-MM-dd"
                   monthYearListArray.append(fmt.string(from: startDate))
                   startDate = calendar.date(byAdding: .day, value: 1, to: startDate)!
               }
   
               print("monthYearListArray: \(monthYearListArray)")
               mTableView.reloadData()
           }
   
           func dateFromString(_ dateString: String) -> Date {
               let dateFormatter = DateFormatter()
               dateFormatter.dateFormat = "yyyy-MM-dd"
   
               return dateFormatter.date(from: dateString)!
           }
   
       }
   

Answer 1

不要避免重复使用单元格,而是确保所有UI元素始终处于已定义的状态

 if isFromActionSheet && indexPath.row == selectedTagValue{
     cell.mSessionLabel.text = aSheetValue
     isFromActionSheet = false
 } else {
     cell.mSessionLabel.text = [default value]
     isFromActionSheet = [default value]
 }