在 uitableview swift4 中展開和折疊多級部分

Question

我想像下面這樣在 uitableview 中擴展和折疊多級數組

• Cat1
  • 亞類1
    • 信息 1
    • 信息 2
  • 亞類2
    • 信息 1
    • 信息 2
  • 子類別3
    • 信息 1
    • 信息 2
• Cat2
  • 亞類1
    • 信息 1
    • 信息 2

為此，我完成了以下代碼。

struct CellData {
var opened = Bool()
var subCatTitle = String()
var subCatList = [String]()
}
struct MainModel {
var opened = Bool()
var categoryTitle = String()
var categoryList = [CellData]()
} 

我列了清單

 @IBOutlet var expandableThreeStageTableView: UITableView!
    var arrayList = [CellData]()
    var expandableList = [MainModel]()

func loadData(){
    arrayList.append(CellData(opened: false, subCatTitle: "SubCat1", subCatList: ["Info1","Info2","Info3"]))
    arrayList.append(CellData(opened: false, subCatTitle: "SubCat2", subCatList: ["Info1","Info2","Info3"]))
    arrayList.append(CellData(opened: false, subCatTitle: "SubCat3", subCatList: ["Info1","Info2"]))
    arrayList.append(CellData(opened: false, subCatTitle: "SubCat4", subCatList: ["Info1"]))

    expandableList.append(MainModel(opened: true, categoryTitle: "Cat1", categoryList: arrayList))
    expandableList.append(MainModel(opened: false, categoryTitle: "Cat2", categoryList: arrayList))
    expandableList.append(MainModel(opened: false, categoryTitle: "Cat3", categoryList: arrayList))
}

和委托，數據源方法如下

extension TextFieldAsSearchVC : UITableViewDataSource{
func numberOfSections(in tableView: UITableView) -> Int {
        return expandableList.count
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: 
Int) -> Int {
        if expandableList[section].opened{
            if expandableList[section].categoryList[section].opened{
                return 
expandableList[section].categoryList[section].subCatList.count////which extra count should return here
            }else{
                print("COUNT ",expandableList[section].categoryList.count)
                return expandableList[section].categoryList.count + 
1///here +1 is for catname + subcatname

            }
        }else{
            return 1
        }
    }

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

        if indexPath.row == 0{
            let cell = 
expandableThreeStageTableView.dequeueReusableCell(withIdentifier: 
"TextFieldAsSearchVCCell", for: indexPath) as! TextFieldAsSearchVCCell
            cell.lblValue.text = 
expandableList[indexPath.section].categoryTitle
            return cell
        }else if indexPath.row <= 
expandableList[indexPath.section].categoryList.count{
             let cell = 
expandableThreeStageTableView.dequeueReusableCell(withIdentifier: 
"SectionDataCell", for: indexPath) as! SectionDataCell
            cell.rowLabel.text = 
expandableList[indexPath.section].categoryList[indexPath.row - 
1].subCatTitle
            return cell
        }
        else{
            let cell = 
expandableThreeStageTableView.dequeueReusableCell(withIdentifier: 
"SectionDataCell", for: indexPath) as! SectionDataCell
  cell.rowLabel.text = 

 expandableList[indexPath.section].categoryList[indexPath.row].
subCatList[indexPath.row]//how to access rows in subcategories
            return cell
        }
    }
}
extension TextFieldAsSearchVC : UITableViewDelegate{
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: 
IndexPath) {
        if indexPath.row == 0{
            if expandableList[indexPath.section].opened{
                expandableList[indexPath.section].opened = false
                //now reload the section
                let sections = IndexSet(integer: indexPath.section)
                expandableThreeStageTableView.reloadSections(sections, 
with: .automatic)
            }else{
                expandableList[indexPath.section].opened = true
                //now reload sections
                let sections = IndexSet(integer: indexPath.section)
                expandableThreeStageTableView.reloadSections(sections, 
with: .automatic)
            }

        }else {
            if 
expandableList[indexPath.section].categoryList[indexPath.row].opened{

expandableList[indexPath.section].categoryList[indexPath.row].opened = 
false
                expandableThreeStageTableView.reloadRows(at: 
[IndexPath(index: indexPath.row)], with: .automatic)
            }else{

expandableList[indexPath.section].categoryList[indexPath.row].opened = 
true
                expandableThreeStageTableView.reloadRows(at: 
[IndexPath(index: indexPath.row)], with: .automatic)
            }
        }
    }
}

從上面的代碼中，我可以展開和折疊類別，但不能展開和折疊子類別。當我嘗試單擊子類別時，它給了我一個錯誤

*** Terminating app due to uncaught exception 
'NSInternalInconsistencyException', reason: 'Invalid index path for use 
with UITableView. Index paths passed to table view must contain exactly 
two indices specifying the section and row. Please use the category on 
NSIndexPath in NSIndexPath+UIKitAdditions.h if possible.'

如何處理這種類型的邏輯？

Answer 1

您遇到的具體錯誤發生在這一行：

expandableThreeStageTableView.reloadRows(at: [IndexPath(index: indexPath.row)], with: .automatic)

IndexPath需要row和一個section ； 你只是提供了一行。 所以它應該是這樣的：

expandableThreeStageTableView.reloadRows(at: [IndexPath(row: indexPath.row, section: indexPath.section)], with: .automatic)

如果您真的只需要重新加載當前的indexPath ，只需像這樣調用它：

expandableThreeStageTableView.reloadRows(at: [indexPath], with: .automatic)

這將解決您遇到的錯誤，但我不知道這是否能解決您的問題。