Dispatch.main.async 部分中的行数无效

Question

我在快速检查我的任务时遇到问题，这导致应用程序崩溃并出现错误：

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (7) must be equal to the number of rows contained in that section before the update (9), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).'

点击单选按钮时的代码

func RadioTapped(_ cell: TableViewCell) {
    if let indexPath = tableView.indexPath(for: cell) {
        // Removes task from coreData
        let task = self.tasks[indexPath.row]

        self.context.delete(task)
        do {
            self.tasks = try self.context.fetch(TodayTask.fetchRequest())
            (UIApplication.shared.delegate as! AppDelegate).saveContext()

            // Animate the removal of task cell
            DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(800),execute: {
                self.tableView.deleteRows(at: [indexPath], with: .fade)                    
            })
        } catch {
            print("Fetching failed")
        }
    }
}

Answer 1

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (7) must be equal to the number of rows contained in that section before the update (9), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).'

此崩溃意味着您正在删除 table 行。您没有更新 arrayCount，例如您在 numberOfRowsInSection 方法中定义了 8，然后在删除该行之前，您还需要根据要删除的行更新行数。否则，当您的 deleteRows 将被调用时，它也会调用 numberOfRowsInSection 方法，并且计数将不匹配并且会崩溃。

Dispatch.main.async 部分中的行数无效

Dispatch.main.async invalid number of rows in section

core-data

dispatch

ios

swift