ios - 由于未捕获的异常 'NSInternalInconsistencyException' 而终止应用程序

Question

如果用户触摸 UITableView 并为以下代码更新 TableView

[self.myTableView beginUpdates];
[myTableView endUpdates];

然后它会产生以下崩溃报告。

2013-12-17 17:27:33.446 planobot[12300:a0b] *** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-2903.23/UITableView.m:1330
2013-12-17 17:27:33.469 planobot[12300:a0b] *** 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 (1) must be equal to the number of rows contained in that section before the update (7), 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).'
*** First throw call stack:
(
    0   CoreFoundation                      0x0210e5e4 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x01e918b6 objc_exception_throw + 44
    2   CoreFoundation                      0x0210e448 +[NSException raise:format:arguments:] + 136
    3   Foundation                          0x00fe5fee -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 116
    4   UIKit                               0x0024485d -[UITableView _endCellAnimationsWithContext:] + 13402
    5   UIKit                               0x00253caa -[UITableView endUpdatesWithContext:] + 51
    6   UIKit                               0x00253cd8 -[UITableView endUpdates] + 41
    7   planobot                            0x0004f34a -[DailyReportViewController tableView:didSelectRowAtIndexPath:] + 1658
    8   UIKit                               0x002557b1 -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 1513
    9   UIKit                               0x00255924 -[UITableView _userSelectRowAtPendingSelectionIndexPath:] + 279
    10  UIKit                               0x00259908 __38-[UITableView touchesEnded:withEvent:]_block_invoke + 43
    11  UIKit                               0x00190183 ___afterCACommitHandler_block_invoke + 15
    12  UIKit                               0x0019012e _applyBlockToCFArrayCopiedToStack + 403
    13  UIKit                               0x0018ff5a _afterCACommitHandler + 532
    14  CoreFoundation                      0x020d64ce __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 30
    15  CoreFoundation                      0x020d641f __CFRunLoopDoObservers + 399
    16  CoreFoundation                      0x020b4344 __CFRunLoopRun + 1076
    17  CoreFoundation                      0x020b3ac3 CFRunLoopRunSpecific + 467
    18  CoreFoundation                      0x020b38db CFRunLoopRunInMode + 123
    19  GraphicsServices                    0x02fec9e2 GSEventRunModal + 192
    20  GraphicsServices                    0x02fec809 GSEventRun + 104
    21  UIKit                               0x00173d3b UIApplicationMain + 1225
    22  planobot                            0x000a6a4d main + 141
    23  planobot                            0x000022b5 start + 53
)
libc++abi.dylib: terminating with uncaught exception of type NSException

为什么应用程序会抛出 NSInternalInconsistencyException？

Answer 1

当我的计数不正确时，我经常会看到这种情况。基于此:

reason: 'Invalid update: invalid number of rows in section 0.  The number of rows contained in an existing section after the update (1) must be equal to the number of rows contained in that section before the update (7), 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).'

我猜你的表中有 7 个元素(由 tableView:numberOfRowsInSection: 报告)返回 7，现在返回 1。这让我相信你认为调用

 [self.myTableView beginUpdates];
 [myTableView endUpdates];

删除行时就足够了。

但是您需要先告诉 UITableView 哪些行被删除(或添加)。这将取决于您的具体情况，但如果您想要删除第零部分的前七行，它看起来像这样。

NSMutableArray *indexes = [[NSMutableArray alloc] init];
for (int i = 0; i <= 6; i++)
{
    [indexes addObject:[NSIndexPath indexPathForItem:i inSection:0]];
}
[myTable beginUpdates];
[myTable deleteRowsAtIndexPaths:indexes withRowAnimation:NO];
[myTable endUpdates];

正如@Marco 所说，只需使用相同的指针指向您的表，否则会有点困惑，我在我的示例中就是这样做的。

或者，如果您只是想告诉您的表完全重新加载，您可以调用 reloadData instaed。

[myTable reloadData];

我认为这会比另一种手动指定要添加或删除哪些行的方法效率低，但在 7 的表中我认为它会很好。