当我在 swift iOS 中垂直滚动时，Tableview 单元格数据正在发生变化

Question

我开发了一个 iOS 应用程序，它有几个 tableviews。 如果我不滚动它工作正常，如果我滚动单元格内的表格视图数据数据正在改变请让我在这里完美。 以下是第一个表的代码，其中包含 UISwitch 和文本。 如需参考，请观看视频： https : //drive.google.com/open? id =1hVHnAyGnQFrhvzLSoJjeMzG6wlfxoURm

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
   if let d = self.data {
       return d.count
   }
   return  0

}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    var cell = tableView.dequeueReusableCell(withIdentifier: "cell")

    if let _ = cell {} else {
        cell = UITableViewCell(style: .default, reuseIdentifier: "cell")
    }
    if let d = self.data {
        cell?.textLabel?.text = d[indexPath.row]
        let switchView = UISwitch(frame: .zero)
        switchView.setOn(self.isFolderIsAdded(folderName: d[indexPath.row]), animated: true)
        switchView.tag = indexPath.row // for detect which row switch Changed
        switchView.addTarget(self, action: #selector(self.switchChanged(_:)), for: .valueChanged)
        cell?.accessoryView = switchView

    }
    return cell!
}

func isFolderIsAdded(folderName:String) -> Bool{
    for   val in listOfSelectedFolder{
        if(folderName == val ){
            return true
        }
    }
    return false;
}

@objc func switchChanged(_ sender : UISwitch!){
    if let d = self.data {
        if(sender.isOn){
            self.delegate?.selectedSubFolder(name: d[sender.tag])
           } else {
            self.delegate?.deleteFilesFromFolder(folderName: d[sender.tag])
        }
    }
}

这是第二个表代码，它将具有图像视图和文本。 我创建了名为 TableViewCell 的自定义单元格 . 如需参考，请观看视频： https : //drive.google.com/open? id =11snH5_henOadVCVqS9bL5SZRjcZF3vEU

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableViewContent.dequeueReusableCell(withIdentifier: "myCell", for: indexPath) as! TableViewCell
    if let _ = contentModel[self.currentMode]{
        tempArr1 = appendFolderName(files: contentModel[self.currentMode]!, name: self.currentMode)!

    }
    if indexPath.row < tempArr1.count {
        cell.setupCellData(text: tempArr1[indexPath.row])
    }else{
        if let res = self.getFilesFromSubFolder(contentName: self.currentMode, folderName: self.SelectedFolder) {
            cell.setupCellData(text: res[indexPath.row - tempArr1.count] )

        }
    }
    let bgColorView = UIView()
    bgColorView.backgroundColor = UIColor.gray
    cell.selectedBackgroundView = bgColorView
    return cell
}

func setupCellData(text:String) {
    let temarr = text.components(separatedBy: "@")
    let str =  temarr.last?.capitalized
    let strq = temarr.first?.lowercased()
    let newstr = strq?.components(separatedBy: "-")
    let val = newstr?.last
    let content = val!.lowercased() + "@" +  str!
    self.ContentLabel.text = content
    if ((self.ContentLabel.text?.contains("pps"))!||(self.ContentLabel.text?.contains("pptx"))!||(self.ContentLabel.text?.contains("ppt"))!){
        imageData.image = #imageLiteral(resourceName: "table_Content_ppt")
    }else if ((self.ContentLabel.text?.contains("mp4"))! || (self.ContentLabel.text?.contains("mp3"))!){
        imageData.image = #imageLiteral(resourceName: "table_Content")
    }else if (self.ContentLabel.text?.contains("pdf"))!{
        imageData.image = #imageLiteral(resourceName: "pdf_content")
    }else if (self.ContentLabel.text?.contains("url"))!{
        imageData.image = #imageLiteral(resourceName: "url_content")
    }else if (self.ContentLabel.text?.contains("exe"))!{
        imageData.image = #imageLiteral(resourceName: "application_content")
    }else if (self.ContentLabel.text?.contains("doc"))!{
        imageData.image = #imageLiteral(resourceName: "word_content")
    }else if (self.ContentLabel.text?.contains("bat"))!{
        imageData.image = #imageLiteral(resourceName: "cmd")
    }
    else if (self.ContentLabel.text?.contains("lnk"))!{
        imageData.image = #imageLiteral(resourceName: "cmd")
    }
    else if ((self.ContentLabel.text?.contains("png"))! || (self.ContentLabel.text?.contains("jpg"))! || (self.ContentLabel.text?.contains("jpeg"))! || (self.ContentLabel.text?.contains("psd"))! || (self.ContentLabel.text?.contains("tiff"))! || (self.ContentLabel.text?.contains("gif"))!) {

        imageData.image = #imageLiteral(resourceName: "img")

    }else{
        imageData.image = nil

    }

}

我在 tableview 单元格类中添加了 prepareForReuse() 方法，但结果仍然是滚动后更改了相同的内容。

    override func prepareForReuse() {
    super.prepareForReuse()
    // Clear all content based views and their actions here
     imageData.image = nil
    ContentLabel.text = ""
}

Answer 1

你必须更新listOfSelectedFolder数组switchChanged 。

假设self.data将被声明为非可选将方法更改为

@objc func switchChanged(_ sender : UISwitch){
    let folderName = self.data[sender.tag]
    if sender.isOn {
        listOfSelectedFolder.append(folderName)
        self.delegate?.selectedSubFolder(name: folderName)
    } else {
       if let index = listOfSelectedFolder.index(of: folderName) {
          listOfSelectedFolder.remove(at: index)
       }
       self.delegate?.deleteFilesFromFolder(folderName: folderName)
    }
}

其他方法可以优化

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return self.data.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
    let folderName = self.data[indexPath.row]
    cell.textLabel?.text = folderName
    let switchView = UISwitch(frame: .zero)
    switchView.setOn(self.isFolderAdded(folderName: folderName), animated: true)
    switchView.tag = indexPath.row // for detect which row switch Changed
    switchView.addTarget(self, action: #selector(switchChanged), for: .valueChanged)
    cell.accessoryView = switchView
    return cell
}

func isFolderAdded(folderName: String) -> Bool{
    return listOfSelectedFolder.contains(folderName)
}

但是强烈建议使用自定义结构作为数据模型并添加isSelected属性。 并将listOfSelectedFolder声明为一个集合。

Answer 2

把它放在你的单元格类中

    override func prepareForReuse() {
        super.prepareForReuse()
        // Clear all content based views and their actions here
    }

Answer 3

我之前也遇到过同样的问题，我尝试在 cellForRowAt 中添加 layoutIfNeeded() 并解决了问题。

 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    var cell = tableView.dequeueReusableCell(withIdentifier: "cell")

    if let _ = cell {} else {
        cell = UITableViewCell(style: .default, reuseIdentifier: "cell")
    }
    if let d = self.data {
        cell?.textLabel?.text = d[indexPath.row]
        let switchView = UISwitch(frame: .zero)
        switchView.setOn(self.isFolderIsAdded(folderName: d[indexPath.row]), animated: true)
        switchView.tag = indexPath.row // for detect which row switch Changed
        switchView.addTarget(self, action: #selector(self.switchChanged(_:)), for: .valueChanged)
        cell?.accessoryView = switchView
cell?.layoutIfNeeded() <--- Add this

    }
    return cell!
}