ios - UITableView 搜索后复选标记位于错误的位置

Question

我想在我的 tableView 中搜索，设置复选标记并将带有复选标记的对象保存在 Realm 中。但是，如果我在搜索后设置复选标记并取消搜索，则复选标记位于我单击的indexPath 处，而不是位于对象处。我无法更好地解释它，所以这是一个例子: After I search an exercise.

After I clicked the cancel button

这是我的代码:

class ShowExcercisesTableViewController: UITableViewController, UISearchResultsUpdating, UISearchBarDelegate {

//Properties
let realm = try! Realm()
var request2: Results<Excercise>?{
    didSet{
        tableView.reloadData()
    }
}
var searchOrNot: Excercise?
var searchResults = try! Realm().objects(Excercise.self)
var resultSearchController: UISearchController!
var shouldShowSearchResults = false
var muscleGroupForSearch: String?

//Searchbar Funktionen
func filterResultsWithSearchString(searchString: String){
    let predicate = NSPredicate(format: "name CONTAINS [c]%@ AND muscleGroup =%@ AND copied = false", searchString, muscleGroupForSearch!)
    searchResults = realm.objects(Excercise.self).filter(predicate).sorted(byProperty: "name", ascending: true)
}

func updateSearchResults(for searchController: UISearchController) {
    let searchString = searchController.searchBar.text
    filterResultsWithSearchString(searchString: searchString!)
    tableView.reloadData()
}

func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
    shouldShowSearchResults = true
    tableView.reloadData()
}

func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
    shouldShowSearchResults = false
    tableView.reloadData()
}

func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
    if !shouldShowSearchResults {
        shouldShowSearchResults = true
        tableView.reloadData()
    }
    resultSearchController.searchBar.resignFirstResponder()
}

//Lifecycle
override func viewDidLoad() {
    super.viewDidLoad()

    self.resultSearchController = ({
        let controller = UISearchController(searchResultsController: nil)
        controller.searchResultsUpdater = self
        controller.searchBar.delegate = self
        controller.dimsBackgroundDuringPresentation = false
        controller.searchBar.sizeToFit()
        controller.searchBar.placeholder = "Suche Übungen..."

        self.tableView.tableHeaderView = controller.searchBar

        return controller
    })()

    self.tableView.reloadData()
}

//TableView Funktionen
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    if shouldShowSearchResults {
        return searchResults.count
    }
    else{
        return request2!.count
    }
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell: ShowExcercisesTableViewCell = tableView.dequeueReusableCell(withIdentifier: CellIdentifier.showExcercises, for: indexPath) as! ShowExcercisesTableViewCell
    if shouldShowSearchResults{
        let excercise = searchResults[indexPath.row]
        cell.nameLabel.text = excercise.name
        if fromTrainingPlan{
        if excercise.selected == true{
            cell.accessoryType = .checkmark
        }
        else{
            cell.accessoryType = .none
        }
        }
        return cell
    }
    else{
        let excercise = request2![indexPath.row]
        cell.nameLabel.text = excercise.name
        if fromTrainingPlan{
        if excercise.selected == true{
            cell.accessoryType = .checkmark
            }
        else{
            cell.accessoryType = .none
        }
        }
        return cell
    }
}

//Checkmarks
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    if fromTrainingPlan == true && request2 != nil{
        if shouldShowSearchResults{
            searchOrNot = searchResults[indexPath.row]
        }
        else{
            searchOrNot = request2![indexPath.row]
        }
        tableView.deselectRow(at: indexPath, animated: true)

        let cell: ShowExcercisesTableViewCell = tableView.cellForRow(at: indexPath) as! ShowExcercisesTableViewCell
        do {
            try realm.write {
                searchOrNot!.selected = !searchOrNot!.selected
            }
        }
        catch{
            print(error)
        }

        if searchOrNot!.selected {
            cell.accessoryType = .checkmark
        }
        else {
            cell.accessoryType = .none
        }
    }
}

抱歉有这么多代码，我不确定什么是相关的，什么是不相关的。有没有办法在搜索后在正确的位置设置复选标记？提前致谢!

现在正在运行。

Answer 1

在您的cellForRowAtIndexPath中，您需要禁用不需要的单元格的复选标记。您仅启用具有此功能的单元。

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell: ShowExcercisesTableViewCell = tableView.dequeueReusableCell(withIdentifier: CellIdentifier.showExcercises, for: indexPath) as! ShowExcercisesTableViewCell
    if shouldShowSearchResults{
        let excercise = searchResults[indexPath.row]
        cell.nameLabel.text = excercise.name
        if excercise.selected == true{
            cell.accessoryType = .checkmark
        } else {
            cell.accessoryType = .none // Add this code here
        }
        return cell
    }
    else{
        let excercise = request2![indexPath.row]
        cell.nameLabel.text = excercise.name
        if excercise.selected == true {
            cell.accessoryType = .checkmark
        } else {
            cell.accessoryType = .none // Add this code here
        }
        return cell
    }
}

UITableViews 在内部重用单元格。因此，当您搜索时，您会说第一个单元格有一个复选标记，然后当您取消时，它会返回到表格并查看单元格，而您的cellForRow代码永远不会告诉它单元格 1 不再被检查，因此它在那里保留复选标记。该单元格不会被重新创建，它已经存在，因此您无法假设它处于什么状态(未检查或已检查)。