ios - 使用获取的结果 Controller 对删除的行进行动画处理

Question

我正在寻找从表格 View 中删除项目的动画。我将获取结果 Controller 与 CoreData 结合使用。我遇到的问题是关于行数必须如何与项目数匹配的异常。

这是我删除时遇到的错误:

reason: 'Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (4) must be equal to the number of rows contained in that section before the update (3), plus or minus the number of rows inserted or deleted from that section (0 inserted, 0 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).'

这是代码:

override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
    guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
    let context = appDelegate.persistentContainer.viewContext

    if editingStyle == .delete {
        // Delete the row from the data source
        context.delete(fetchedResultsController.object(at: indexPath))

        do {
            try context.save()
            // Animate deleted row
            tableView.deleteRows(at: [indexPath], with: .fade)
        } catch {
            print("There was an error: \(error)")
        }
    }
}

谢谢。

Answer 1

您还需要从数组(或任何数据源)中删除该项目。

基本上，当您在 UITableView 中设置删除动画时，tableView(_:numberOfRowsInSection:) 必须少返回一个对象(或者无论您删除多少个项目)