删除表格单元格导致崩溃 [英] Deleting table cell causes crash

问题描述

当使用 deleteRowsAtIndexPaths 删除表格单元格时，如果我尝试使用滑动手势删除单元格以进入编辑模式，然后点击删除，我会崩溃.如果我通过切换编辑/完成按钮进入编辑模式，然后删除单元格，表格会正常更新而不会出现问题.

When deleting table cell using deleteRowsAtIndexPaths I get a crash if I attempt the delete the cell using a swipe gesture to enter editing mode and then hit delete. If I enter editing mode by toggling an edit/done button then delete cell the table gracefully updates without a problem.

我也尝试过使用 [table beginUpdates] &[table endUpdates] 也没有成功.[table reloadData] 也适用于任何一种情况同样如您所见，我已经尝试过 [table reloadSections:[NSIndexSet indexSetWithIndex: indexPath.section] withRowAnimation: UITableViewRowAnimationFade]; 在使用编辑/完成按钮进入编辑模式时发生相同的崩溃.

I've also tried using [table beginUpdates] & [table endUpdates] also without success. Also [table reloadData] works in either case Also as you can see I've tried [table reloadSections:[NSIndexSet indexSetWithIndex: indexPath.section] withRowAnimation: UITableViewRowAnimationFade]; with the same crash when entering editing mode with edit/done button.

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath 
{
    if (editingStyle == UITableViewCellEditingStyleDelete) 
    {
        NSMutableArray *temp = nil;
        switch (indexPath.section)
        {
            case 0:
            {
                temp = self.entireSavedArray;
                break;
            }
            case 1:
            {
                temp = self.entireSavedArray2014;
                break;
            }
            case 2:
            {
                temp = self.entireSavedArray2013;
                break;
            }
            case 3:
            {
                temp = self.entireSavedArray2012;
                break;
            } 
            case 4:
            {
                temp = self.entireSavedArray2011;
                break;
            }          
            case 5:
            {
                temp = self.entireSavedArray2010;
                break;
            }
            default:
                break;
        }
        [temp removeObjectAtIndex: ((int)indexPath.row * 11)];
        [temp removeObjectAtIndex: ((int)indexPath.row * 11)];
        [temp removeObjectAtIndex: ((int)indexPath.row * 11)];
        [temp removeObjectAtIndex: ((int)indexPath.row * 11)];
        [temp removeObjectAtIndex: ((int)indexPath.row * 11)];
        [temp removeObjectAtIndex: ((int)indexPath.row * 11)];
        [temp removeObjectAtIndex: ((int)indexPath.row * 11)];
        [temp removeObjectAtIndex: ((int)indexPath.row * 11)];
        [temp removeObjectAtIndex: ((int)indexPath.row * 11)];
        [temp removeObjectAtIndex: ((int)indexPath.row * 11)];
        [temp removeObjectAtIndex: ((int)indexPath.row * 11)];

        [self.table deleteRowsAtIndexPaths: [NSArray arrayWithObjects: indexPath, nil] withRowAnimation: UITableViewRowAnimationFade];
        //[tableView reloadSections:[NSIndexSet indexSetWithIndex: indexPath.section] withRowAnimation: UITableViewRowAnimationFade];
    }
}

推荐答案

问题在于滑动手势无需点击编辑/完成按钮即可将表格置于编辑模式.这通常不会有问题，但是当表格未处于编辑模式时，我将占位符单元格添加到表格中，然后在按下完成按钮时将它们添加回来.(我更改了我的数据模型)当我最初创建应用程序时，我通过在点击编辑/完成按钮时进行调整来解决这个问题.

The issue was the fact that the swiping gesture puts the table into edit mode without tapping the edit/done button. This normally would not be a problem, however when the table was not in edit mode I added place holder cells into the table, then adding them back when the done button was pressed. (I changed my data model) When I originally created the app I had solved that by making the adjustments when the edit/done button was tapped.

解决方案:由于滑动手势进入编辑模式而不点击编辑/完成按钮，我需要以另一种方式进行调整.我通过使用:

Solution: Since the swiping gesture enters edit mode without tapping the edit/done button I needed to make the adjustments in another way. I did this by using:

- (void)tableView:(UITableView*)tableView willBeginEditingRowAtIndexPath:(NSIndexPath *)indexPath{
[self makeAdjustments];
}

并在此处进行调整:

- (void)tableView:(UITableView*)tableView didEndEditingRowAtIndexPath:(NSIndexPath *)indexPath{
[self makeAdjustments];
}

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