我有一个UITableView,它更新和工作正常,直到它获得超过16个项目,然后当尝试终止更新后调用insertRowsAtIndexPaths崩溃.

正在添加的NSIndexPath都是有效的. -numberOfRowsInSection返回正确的数字.它不是抛出与数据集相关的错误,而是与其崩溃

*** Terminating app due to uncaught exception ‘NSInvalidArgumentException’,reason: ‘*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil’

当在tableView上调用endUpdates时.

数据源全部存在,NSIndexPaths很好.该代码在0到16行之间工作正常,但是当我添加第17个时,它会崩溃.另外,如果我启动它22项,它的工作正常,当我添加23rd它崩溃…如果我调用重新加载数据,而不是进行更新和插入过程它的工作正常,所以这与数据本身无关,和它不应该与我如何插入行,因为它工作通过16 …

我完全感到困惑这是我的更新方法.它始终被主线程调用.

- (void)updateConversation:(NSNotification*)notification
{
    NSDictionary *updateInfo = [notification userInfo];
    //NSLog(@"Got update %@",updateInfo);

    if ([[updateInfo objectForKey:@"success"] integerValue] == YES) {
        [self updateConversationUI];

        int addedStatementCount = [[updateInfo objectForKey:@"addedStatementCount"] intValue];

        if (addedStatementCount > 0) {
            //[self.tableView reloadData];
            [self.tableView beginUpdates];
            int prevIoUsStatmentCount = [[updateInfo objectForKey:@"prevIoUsStatmentCount"] intValue];

            NSLog(@"owner %i,Was %i,now %i,change of %i",self.owner,prevIoUsStatmentCount,(int)self.conversation.statements.count,addedStatementCount);

            NSMutableArray *rowPaths = [[NSMutableArray alloc] init];

            for (int i = prevIoUsStatmentCount; i < prevIoUsStatmentCount + addedStatementCount; i++) {
                NSIndexPath *path = [NSIndexPath indexPathForRow:i inSection:0];
                [rowPaths addObject:path];
            }

            [self.tableView insertRowsAtIndexPaths:rowPaths withRowAnimation:UITableViewRowAnimationBottom];        
            [self.tableView endUpdates];
            [self.tableView scrollToRowAtIndexPath:[rowPaths lastObject] atScrollPosition:UITableViewScrollPositionBottom animated:YES];
        }
    }
}

通过[self.tableView endUpdates]的其他崩溃是UITableView

*** Terminating app due to uncaught exception 'NSInvalidArgumentException',reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
*** First throw call stack:
(
    0   CoreFoundation                      0x000000010189b795 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x00000001015fe991 objc_exception_throw + 43
    2   CoreFoundation                      0x0000000101852564 -[__NSArrayM insertObject:atIndex:] + 820
    3   UIKit                               0x0000000100317900 __46-[UITableView _updateWithItems:updateSupport:]_block_invoke691 + 173
    4   UIKit                               0x00000001002b5daf +[UIView(UIViewAnimationWithBlocks) _setupAnimationWithDuration:delay:view:options:factory:animations:start:animationStateGenerator:completion:] + 460
    5   UIKit                               0x00000001002b6004 +[UIView(UIViewAnimationWithBlocks) animateWithDuration:delay:options:animations:completion:] + 57
    6   UIKit                               0x00000001003174cb -[UITableView _updateWithItems:updateSupport:] + 2632
    7   UIKit                               0x0000000100312b18 -[UITableView _endCellAnimationsWithContext:] + 11615
    8   Dev App                         0x0000000100006036 -[ConversationViewController updateConversation:] + 998
    9   CoreFoundation                      0x00000001018f121c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
    10  CoreFoundation                      0x000000010185370d _CFXNotificationPost + 2381
    11  Dev App                         0x00000001000055ac -[ConversationManager postNotification:] + 92
    12  Foundation                          0x0000000101204557 __NSThreadPerformPerform + 227
    13  CoreFoundation                      0x000000010182aec1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    14  CoreFoundation                      0x000000010182a792 __CFRunLoopDoSources0 + 242
    15  CoreFoundation                      0x000000010184661f __CFRunLoopRun + 767
    16  CoreFoundation                      0x0000000101845f33 CFRunLoopRunSpecific + 467
    17  GraphicsServices                    0x00000001039a23a0 GSEventRunModal + 161
    18  UIKit                               0x0000000100261043 UIApplicationMain + 1010
    19  Dev App                         0x0000000100003613 main + 115
    20  libdyld.dylib                       0x0000000101f2a5fd start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

这似乎是操作系统中的一个错误,堆栈将表明它与动画块有关,但无论我将动画设置为什么,包括没有.

并重新声明.这可以通过16个项目,然后插入导致崩溃的项目.它也是在初始设置时调用加载数据,它将加载任何数量的项目,包括超过16.但是当再次调用时,纯粹是从16或更高的更新到更高的事情会崩溃.

最奇怪的问题我还没有遇到表视图…

在iOS 7下的设备和模拟器上,最新的Xcode供参考.