ios - tableView:commitEditingStyle:forRowAtIndexPath: 怎么能用 nil indexPath 调用？

Question

我终于找到了一个奇怪的崩溃。它是由使用indexPathtableView:commitEditingStyle:forRowAtIndexPath:调用引起的。nil但怎么可能呢？

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // DEBUG
        if (indexPath == nil) {
            NSLog(@"Deleting row at nil indexPath in %@", self);
        }
        [self deleteItemAtIndexPath:indexPath fromTableView:tableView];
    }
}

这是堆栈跟踪：

6    XXX     -[ListViewController tableView:commitEditingStyle:forRowAtIndexPath:] (ListViewController.m:427)
7    UIKit   -[UITableView(UITableViewInternal) animateDeletionOfRowWithCell:] + 85
8    UIKit   -[UIApplication sendAction:to:from:forEvent:] + 73
9    UIKit   -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 31
10   UIKit   -[UIControl sendAction:to:forEvent:] + 45
11   UIKit   -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 503
12   UIKit   -[UIApplication sendAction:to:from:forEvent:] + 73
13   UIKit   -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 31
14   UIKit   -[UIControl sendAction:to:forEvent:] + 45
15   UIKit   -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 503
16   UIKit   -[UIControl touchesEnded:withEvent:] + 489
17   UIKit   -[UIWindow _sendTouchesForEvent:] + 525
18   UIKit   -[UIApplication sendEvent:] + 381
19   UIKit   _UIApplicationHandleEvent + 6155
20   GraphicsServices    _PurpleEventCallback + 591
21   CoreFoundation  __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
22   CoreFoundation  __CFRunLoopDoSources0 + 213
23   CoreFoundation  __CFRunLoopRun + 647
24   CoreFoundation  CFRunLoopRunSpecific + 357
25   CoreFoundation  CFRunLoopRunInMode + 105
26   GraphicsServices    GSEventRunModal + 75
27   UIKit   UIApplicationMain + 1121
28   XXX     main (main.m:16)
29   XXX     start + 40

Answer 1

例外是由于 index 处存在数据，但 indexPath 已被删除。您需要删除索引处的数组对象。

尝试以下操作：

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath 
   {
      if (editingStyle == UITableViewCellEditingStyleDelete) 
      {
         [self deleteItemAtIndexPath:indexPath fromTableView:tableView];
         NSMutableArray * tempArray = [yourDataArray mutableCopy];
        [tempArray removeObjectAtIndex: indexPath.row];
         yourDataArray = tempArray;
        [tableView reloadData];
      }
   }