uitableViewcell 内的 UIPickerView

Posted 2023-02-24

【中文标题】uitableViewcell 内的 UIPickerView

【英文标题】：PickerView inside tableView cell

【发布时间】：2017-08-08 08:25:56

【问题描述】：

我创建了一个表格视图，它采用日期差异并创建该数量的表格视图单元格，每个表格视图单元格由 textview 和针对 textview 的选取器视图组成以选取值。问题是当我使用 PickerView 为 1 位置选择值时，所选值也会反映在另一个单元格上

控制器代码 这里 hfDetailsArr 包含总天数差异

 --function for getting date difference count  
  let dateFormatter = DateFormatter()

                    dateFormatter.dateFormat = "dd/MM/yyyy"
                    let currentCalendar = NSCalendar.current

                    dateFormatter.date(from: dateFormatter.string(from:date1 as Date))

                    let temp = currentCalendar.dateComponents([.day], from:  dateFormatter.date(from: dateFormatter.string(from:date1 as Date))!, to:  dateFormatter.date(from: dateFormatter.string(from:date2 as Date))!)

                    hfDetailsArr.removeAllObjects();
                    //print(temp.day!)

                    if !(temp.day! < 0) && (temp.day! != 0) 
                    for i in 0 ..< (temp.day! + 1)
                        let HFDetailsDates = currentCalendar.date(byAdding: .day, value: i, to: date1 as Date)
                        DataDetails = dateFormatter.string(from: HFDetailsDates!)
                        hfDetailsArr.add(DataDetails)
                         ApplyForDate.append( dateFormatter.string(from: HFDetailsDates!) + ",")

                        
                //print(ApplyForDate)
                    
            HFDEtailsTable.reloadData()



func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
    if hfDetailsArr.count < 0 && hfDetailsArr.count != 0 
        return 0
    else
    return hfDetailsArr.count

    

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 

    let cell : HFDetailsCell! = tableView.dequeueReusableCell(withIdentifier: "cell") as! HFDetailsCell

    cell.txtHFDateFeild.text = hfDetailsArr[indexPath.row] as? String
       cell.cellDelegate = self
    return cell


func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) 
        print("indeddsdsd \(indexPath.row)")

内部带有pickerview的UITableview单元格代码

protocol HFDetailsCellDelegate : class 
    func ValueSelectedChage(sender:HFDetailsCell ,Id:String ,selectedCell:String)


class HFDetailsCell: UITableViewCell,UITextFieldDelegate,UIPickerViewDelegate,UIPickerViewDataSource

    @IBOutlet var txtHFPicker: UITextField!
    @IBOutlet var txtHFDateFeild: UITextField!
   @IBOutlet  var pickerView: UIPickerView! = UIPickerView()
   var HfDtailsOneArr = ["Select","Full Day Leave","Half Day Leave"]
    var position = 0
    //var intHFStatusDetail = ""
   /// internal static var HFtableView = UITableView()
    weak var cellDelegate: HFDetailsCellDelegate?
  //var LeaveDataIDArr = [String?]()

    override func awakeFromNib() 
        txtHFDateFeild.delegate = self
        pickerView.delegate = self
        txtHFPicker.inputView  = pickerView
        pickerView.backgroundColor = UIColor.white
        super.awakeFromNib()
        // Initialization code


    

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

        // Configure the view for the selected state
    

    @IBAction func txtleaveType(_ sender: UITextField) 



    


 //print("buttonclick")

//    //UIpickerView
    func numberOfComponents(in pickerView: UIPickerView) -> Int 
        return 1
    
    //Set number of rows in components

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int 

        return self.HfDtailsOneArr.count

    
    //Set title for each row
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? 

        return HfDtailsOneArr[row]


    
    // Update textfield text when row is selected
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) 
         //  self.cellDelegate?.ValueSelectedChage(sender:self, Id: HFDetailsLeaveCount(position: row), selectedCell: "")
        txtHFPicker.text = HfDtailsOneArr[row]
       print("pickerText:\(txtHFPicker.text!)")

    
        func HFDetailsLeaveCount(position:Int)-> String 

            switch position 
            case 0:
                return "0"
            case 1:
                return "8"
            case 2:
                return "4"
            default:
                return "nil"
            

    
 

在上图中，如果我选择 04/08 日期的值，那么 12/08 会反映相同的值

-- 任何形式的帮助将不胜感激。谢谢你

【问题讨论】：

这是因为单元格是可重复使用的。您可以谷歌如何处理这个问题，或者表格单元类 prepareForReuse() 中有一种方法。在此您设置 textView.text = "" 因此，当单元格被重用时，它不会采用以前的值，直到您提供一个。

@TusharSharma 我会试试这个，但是还有其他方法吗

是的，您需要 google 并找到对您有帮助的东西。有很多相关的问题。

你在 viewcontroller 的任何地方使用HFDetailsCellDelegate 吗？如果不实现委托方法ValueSelectedChage 来跟踪所选值，否则您将丢失单元格中的所选值。

【参考方案1】：

在表格单元格中，选择器选择调用ValueSelectedChage委托方法

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) 
       self.cellDelegate?.ValueSelectedChage(sender:self, Id: HFDetailsLeaveCount(position: row), selectedCell: HfDtailsOneArr[row])
       txtHFPicker.text = HfDtailsOneArr[row]
       print("pickerText:\(txtHFPicker.text!)")

在 viewcontroller 中创建一个变量以保持选定的值

var hfSelectedDetails: [String: String?]?

在视图控制器中实现委托方法

func ValueSelectedChage(sender:HFDetailsCell ,Id:String ,selectedCell:String) 
     let indexpath = self.tableView.indexPathForRowAtPoint(cell.center)
     let key = "\(indexpath.row)"
     hfSelectedDetails[key] = selectedCell
     ....//other code if any

并在cellForRow 中添加

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 

    let cell : HFDetailsCell! = tableView.dequeueReusableCell(withIdentifier: "cell") as! HFDetailsCell

    cell.txtHFDateFeild.text = hfDetailsArr[indexPath.row] as? String
    cell.cellDelegate = self
    let key = "\(indexPath.row)"
    if let selectedValue = hfSelectedDetails[key] 
        cell.txtHFPicker.text = selectedValue
     else 
        cell.txtHFPicker.text = nil
    
    return cell