Deleting a row causes app to end; no console output - iphone

Question

I've got a UITableViewController with a bunch of random items in it. I want to be able to add items to it, and delete items from it. I have a UITextField in the first section header, so you can type in a word/phrase and add it to the list.
You can delete words from the list without issue, however, if you add a word to the list, then try to delete it, the app ends and returns to the home screen; nothing appears in the console.
I'm not sure where the problem lies. Here's the addNewWord method I've been using:
- (void)addNewWord
{
NSString *newWord = [textField text];
[array insertObject:newWord atIndex:0];
NSLog(#"%d", [array count]);
[textField setText:#""];
[[self tableView] reloadData];
}
And here is the -(void) tableView:commitEditingStyle:forRowAtIndexPath method
- (void)tableView:(UITableView *)tableView
commitEditingStyle:(UITableViewCellEditingStyle)editingStyle
forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
[array removeObjectAtIndex:[indexPath row]];
[tableView beginUpdates];
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
withRowAnimation:UITableViewRowAnimationRight];
[tableView endUpdates];
}
NSLog(#"%d", [array count]);
}
That's all I've come up with as to where the problem might be, which is also why I'm stuck.
Any insight is greatly appreciated. Thank you very much!
-Edit: Added [tableView beginUpdates]; and [tableView endUpdates]; same results. Any other ideas?
-Edit2: When I added the [tableView beginUpdates]; and [tableView endUpdates];, I get an exception. Here's the console output:
2010-09-30 05:56:40.172 DictionaryWordsTest[2350:207] *** Assertion failure in
-[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/
UIKit-1262.60.3/UITableView.m:920
2010-09-30 05:56:40.175 DictionaryWordsTest[2350:207] *** 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 (17) must be equal to the
number of rows contained in that section before the update (17),
plus or minus the number of rows inserted or deleted from that section
(0 inserted, 1 deleted).'
*** Call stack at first throw:
(
0 CoreFoundation 0x02486b99 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x025d640e objc_exception_throw + 47
2 CoreFoundation 0x0243f238 +[NSException raise:format:arguments:] + 136
3 Foundation 0x000b2e37 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 116
4 UIKit 0x00332d37 -[UITableView(_UITableViewPrivate) _endCellAnimationsWithContext:] + 8719
5 UIKit 0x00322a01 -[UITableView endUpdates] + 42
6 DictionaryWordsTest 0x00002a73 -[DictionaryViewController tableView:commitEditingStyle:forRowAtIndexPath:] + 140
7 UIKit 0x0031f96d -[UITableView(UITableViewInternal) animateDeletionOfRowWithCell:] + 101
8 UIKit 0x002b87f8 -[UIApplication sendAction:to:from:forEvent:] + 119
9 UIKit 0x00343de0 -[UIControl sendAction:to:forEvent:] + 67
10 UIKit 0x00346262 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
11 UIKit 0x00344e0f -[UIControl touchesEnded:withEvent:] + 458
12 UIKit 0x002dc3d0 -[UIWindow _sendTouchesForEvent:] + 567
13 UIKit 0x002bdcb4 -[UIApplication sendEvent:] + 447
14 UIKit 0x002c29bf _UIApplicationHandleEvent + 7672
15 GraphicsServices 0x02d66822 PurpleEventCallback + 1550
16 CoreFoundation 0x02467ff4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
17 CoreFoundation 0x023c8807 __CFRunLoopDoSource1 + 215
18 CoreFoundation 0x023c5a93 __CFRunLoopRun + 979
19 CoreFoundation 0x023c5350 CFRunLoopRunSpecific + 208
20 CoreFoundation 0x023c5271 CFRunLoopRunInMode + 97
21 GraphicsServices 0x02d6500c GSEventRunModal + 217
22 GraphicsServices 0x02d650d1 GSEventRun + 115
23 UIKit 0x002c6af2 UIApplicationMain + 1160
24 DictionaryWordsTest 0x00001f58 main + 102
25 DictionaryWordsTest 0x00001ee9 start + 53
)
terminate called after throwing an instance of 'NSException'

Answer 1

You need to wrap your -[tableView deleteRowsAtIndexPaths] call with [tableView beginUpdates] and [tableView endUpdates].

Answer 2

Oddly enough, the answer ended up being something other than what I had expected. I'm not sure what the difference is, and why I was getting no console output, but here's what I ended up doing.
In addNewWord, instead of using reloadData, I used these methods to reload the tableView, and insert the word at the top (So I didn't have to scroll to the bottom of the view to see the new word):
- (void)addNewWord
{
[[self tableView] beginUpdates];
NSString *newWord = [textField text];
[array insertObject:newWord atIndex:0];
[textField setText:#""];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationLeft];
[[self tableView] endUpdates];
}
Then, I think the key is, that addNewWord isn't called from:
[textField addTarget:self action:#selector(addNewWord) forControlEvents:UIControlEventEditingDidEndOnExit];
But, I added a button next to my textfield that calls it. Everything works now.