Swift:'尝试删除第0部分中的第0行,在更新之前只包含0行'

Question

为什么我收到此错误？我需要做什么？

*断言失败 - [UITableView _endCellAnimationsWithContext:],/ BuildRoot/Library/People/com.apple.xbs/Sources/UIKit/UIKit-3600.8.1/UITableView.m:1442 2017-07-06 20:25:30.736267- 0400 BlogApp [1482:340583]*由于未捕获的异常'NSInternalInconsistencyException'而终止应用程序,原因:'尝试从更新之前仅包含0行的第0部分删除第0行'

崩溃就在这里

// ----- Inserting Cell to followedArray -----
let blogObject: Blog = filteredArray[indexPath.section][indexPath.row]
let indexOfObjectInArray = mainArray.index(of: blogObject)

followedArray.insert(blogObject, at: 0)

// ----- Removing Cell from filteredArray -----
filteredArray.remove(at: [indexPath.section][indexPath.row])
mainArray.remove(at: indexOfObjectInArray!)
let rowToRemove = indexPath.row
self.myTableView.deleteRows(at: [IndexPath(row: rowToRemove, section: 0)], with: .fade)

self.myTableView.endUpdates()

我从来没有使用数组数组, var filteredArray = [[Blog]]() 所以也许我只是没有正确访问它或正确删除它.

我刚刚发布了关于修复我正在使用的SearchBar问题的帖子,但是当我尝试它时,我遇到了这个崩溃.当我在搜索对象时单击跟随按钮时会发生这种情况.我不太了解,因为我是SearchBar代码的新手.

从filteredArray中删除单元格时出现问题,可能无法正确访问它,因此无法删除它？我已经逐行设置了断点,并且在从filteredArray中删除单元格时崩溃了

此外,我有一个SearchBar的一般问题,并获得了新的代码,所以这可能会有所帮助.

Swift:让SearchBar搜索两个部分,而不是将它们组合起来

如有任何其他信息,请告诉我,谢谢.

// Follow Button
@IBAction func followButtonClick(_ sender: UIButton!) {

    // Adding row to tag
    let buttonPosition = (sender as AnyObject).convert(CGPoint.zero, to: self.myTableView)
    if let indexPath = self.myTableView.indexPathForRow(at: buttonPosition) {

        // Change Follow to Following
        (sender as UIButton).setImage(UIImage(named: "follow.png")!, for: .normal)
        cell.followButton.isHidden = true
        cell.followedButton.isHidden = false

        // Checking wether to import from mainArray or filteredArray to followedArray
        if !(searchController.isActive && searchController.searchBar.text != "") {

            self.myTableView.beginUpdates()

            // Save identifier into followedIdentifier array
            self.followedIdentifiers.insert(mainArray[indexPath.row].blogID)

            // ----- Inserting Cell to followedArray -----
            followedArray.insert(mainArray[indexPath.row], at: 0)
            myTableView.insertRows(at: [IndexPath(row: 0, section: 0)], with: .fade)

            // ----- Removing Cell from mainArray -----
            mainArray.remove(at: indexPath.row)
            let rowToRemove = indexPath.row
            self.myTableView.deleteRows(at: [IndexPath(row: rowToRemove, section: 1)], with: .fade)

            self.myTableView.endUpdates()

            // After Updating Table, Save the Archived Data to File Manager
            saveData()
        }
        else { // **** Crash in this section ****

            self.myTableView.beginUpdates()

            // Remove identifier into followedIdentifier array
            self.followedIdentifiers.remove(followedArray[indexPath.row].blogID)

            // ----- Inserting Cell to followedArray -----
            let blogObject: Blog = filteredArray[indexPath.section][indexPath.row]
            let indexOfObjectInArray = mainArray.index(of: blogObject)

            followedArray.insert(blogObject, at: 0)

            //------------------------
            // CRASH SHOULD BE HERE (breakpoints lead me here)
            //------------------------

            // ----- Removing Cell from filteredArray -----
            filteredArray.remove(at: [indexPath.section][indexPath.row])
            mainArray.remove(at: indexOfObjectInArray!)
            let rowToRemove = indexPath.row
            self.myTableView.deleteRows(at: [IndexPath(row: rowToRemove, section: 0)], with: .fade)

            self.myTableView.endUpdates()

            // After Updating Table, Save the Archived Data to File Manager
            saveData()
        }
    }
}

我的其余代码,可能有助于解决问题

var mainArray = [Blog]()
var followedArray = [Blog]()
var filteredArray = [[Blog]]()

// Number of Rows in Section
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    if !(searchController.isActive && searchController.searchBar.text != "") {

        if section == 0 {
            return followedArray.count
        } else {
            return mainArray.count
        }
    } else {
        return filteredArray[section].count
    }
}

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

    let CellIdentifier = "Cell"
    var cell = tableView.dequeueReusableCell(withIdentifier: CellIdentifier) as! CustomCell

    if cell != cell {
        cell = CustomCell(style: UITableViewCellStyle.default, reuseIdentifier: CellIdentifier)
    }

    // Configuring the cell
    var blogObject: Blog

    if !(searchController.isActive && searchController.searchBar.text != "") {
        if indexPath.section == 0 {
            blogObject = followedArray[indexPath.row]
            cell.populateCell(blogObject, isFollowed: true, indexPath: indexPath, parentView: self)
        } else {
            blogObject = mainArray[indexPath.row]
            cell.populateCell(blogObject, isFollowed: false, indexPath: indexPath, parentView: self)
        }
    } else {
        blogObject = filteredArray[indexPath.section][indexPath.row]
        cell.populateCell(blogObject, isFollowed: false, indexPath: indexPath, parentView: self)
    }

    return cell
}

取消关注按钮代码

同样的问题应该在这里,因为它与跟随按钮相反.

// Unfollow Button
@IBAction func followedButtonClick(_ sender: UIButton!) {

    // Adding row to tag
    let buttonPosition = (sender as AnyObject).convert(CGPoint.zero, to: self.myTableView)
    if let indexPath = self.myTableView.indexPathForRow(at: buttonPosition) {

        // Change Following to Follow
        (sender as UIButton).setImage(UIImage(named: "followed.png")!, for: .normal)
        cell.followButton.isHidden = false
        cell.followedButton.isHidden = true

        self.myTableView.beginUpdates()

        // Remove identifier into followedIdentifier array
        self.followedIdentifiers.remove(followedArray[indexPath.row].blogID)

        // ----- Inserting Cell to mainArray -----
        mainArray.insert(followedArray[indexPath.row], at: 0)
        myTableView.insertRows(at: [IndexPath(row: 0, section: 1)], with: .fade)

        // ----- Removing Cell from followedArray -----
        followedArray.remove(at: indexPath.row)
        let rowToRemove = indexPath.row
        self.myTableView.deleteRows(at: [IndexPath(row: rowToRemove, section: 0)], with: .fade)

        self.myTableView.endUpdates()

        // After Updating Table, Save the Archived Data to File Manager
        saveData()
    }
}

Answer 1

您必须先从 TableView 中删除单元格！

// ----- Removing Cell from filteredArray -----
self.myTableView.deleteRows(at: [indexPath], with: .fade)
filteredArray.remove(at: [indexPath.section][indexPath.row])
mainArray.remove(at: indexOfObjectInArray!)

试试看。