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要重新创建,只需在CoreDataRecipes下载并运行项目.然后(1)点击,例如,Macaroons查看配方中的成分,(2)滑动以删除成分和(3)刷上另一种成分.崩溃.
我的问题是：我是否错过了示例项目代码中的错误,或者这实际上是操作系统中的错误？其次,是否有一种解决方法可以识别这种情况并对其进行防御,但是仍然允许滑动删除？ (现在,我只是通过从tableView返回UITableViewCellEdiTingStyleNone来禁用滑动删除：ediTingStyleForRowATindexPath：除非我已经处于编辑模式.)
在这样的列表中,“编辑”按钮向tableVC发送setEdiTing：YES,在新行中添加“添加项”按钮(显然允许向列表中添加新项),并且现有项获得添加红色减号图标以允许删除.完成后,Done发送setEdiTing：NO,删除新行和图标.一切正常. (参见下面的调试输出中的案例1).
相反,如果用户只想删除单个项目,则可以通过滑动项目来执行此操作(并通过按delete键确认).为了保持一致,滑动还向tableVC发送setEdiTing：YES,然后delete按钮都发送commitEdiTingStyle：delete消息和setEdiTing：NO消息.问题是系统要求在这两个消息之间的表中行数,而不是在setEdiTing：NO之后.因此,它记得还有一行而不是实际的行.然后,如果您对表执行任何操作(例如再次单击“编辑”,再次插入“添加”行),则会看到不一致的行数和崩溃.请参见下面输出中的案例2.
顺便说一句,我认为如果你进行滑动删除会有第二个错误,但是改变主意并点击完成(而不是点击删除以外的任何地方).它再次递归调用setEdiTing：YEs.见输出中的案例3
============= >>CASE 1: Using Edit control to setEdiTing 2013-12-29 11:02:04.032 Recipes[10287:70b] Num Rows: 4 2013-12-29 11:02:04.035 Recipes[10287:70b] Num Rows: 4 -Hit Edit 2013-12-29 11:02:14.720 Recipes[10287:70b] setEdiTing: On 2013-12-29 11:02:14.725 Recipes[10287:70b] InserTing Add row 4 2013-12-29 11:02:14.726 Recipes[10287:70b] Num Rows: 4 +1 2013-12-29 11:02:14.727 Recipes[10287:70b] Providing Add Cell for row 4 -Hit EditControl ("-") then delete 2013-12-29 11:02:21.806 Recipes[10287:70b] deleting ingredient at row 2 2013-12-29 11:02:21.808 Recipes[10287:70b] Num Rows: 3 +1 -Hit Done 2013-12-29 11:02:28.032 Recipes[10287:70b] setEdiTing: Off 2013-12-29 11:02:28.036 Recipes[10287:70b] deleting Add row 3 2013-12-29 11:02:28.036 Recipes[10287:70b] Num Rows: 3 CASE 2: Using Swipe to delete 2013-12-29 11:03:21.705 Recipes[10304:70b] Num Rows: 4 2013-12-29 11:03:21.707 Recipes[10304:70b] Num Rows: 4 -Swipe on row 2 2013-12-29 11:03:34.357 Recipes[10304:70b] setEdiTing: On 2013-12-29 11:03:34.358 Recipes[10304:70b] InserTing Add row 4 2013-12-29 11:03:34.359 Recipes[10304:70b] Num Rows: 4 +1 2013-12-29 11:03:34.359 Recipes[10304:70b] Providing Add Cell for row 4 -Hit delete 2013-12-29 11:03:38.427 Recipes[10304:70b] deleting ingredient at row 2 2013-12-29 11:03:38.431 Recipes[10304:70b] Num Rows: 3 +1 2013-12-29 11:03:38.432 Recipes[10304:70b] setEdiTing: Off 2013-12-29 11:03:38.434 Recipes[10304:70b] deleting Add row 3 NOTE THAT IT DOES >>NOT<< CALL numberOfRows during this delete,but complains that current numberOfRows is wrong. 2013-12-30 23:54:26.349 Recipes[16694:70b] *** Assertion failure in -[UITableView _endCellAnimationsWithContext:],/sourceCache/UIKit_Sim/UIKit-2935.80.1/UITableView.m:1366 2013-12-30 23:54:26.352 Recipes[16694:70b] *** TerminaTing app due to uncaught exception 'NSInternalInconsistencyException',reason: 'Invalid update: invalid number of rows in section 1. the number of rows contained in an exisTing section after the update (4) must be equal to the number of rows contained in that section before the update (4),plus or minus the number of rows inserted or deleted from that section (1 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 0x01b48c94 __exceptionPreprocess + 180 1 libobjc.A.dylib 0x018c78b6 objc_exception_throw + 44 2 CoreFoundation 0x01b48af8 +[NSException raise:format:arguments:] + 136 3 Foundation 0x005aa1ae -[NSAssertionHandler handleFailureInMethod:object:file:linenumber:description:] + 116 4 UIKit 0x00ab3463 -[UITableView _endCellAnimationsWithContext:] + 13402 5 UIKit 0x00ac313a -[UITableView endupdatesWithContext:] + 51 6 UIKit 0x00ac3168 -[UITableView endupdates] + 41 7 Recipes 0x00009a8c -[RecipeDetailViewController setEdiTing:animated:] + 908 8 UIKit 0x00cab0b5 -[UITableViewController tableView:willBeginEdiTingRowATindexPath:] + 49 9 UIKit 0x00abbb39 -[UITableView _sendWillBeginEdiTingForIndexPath:] + 73 10 UIKit 0x00ac772d -[UITableView _swipeCellAtPoint:] + 346 11 UIKit 0x00c44cd0 -[UITableViewCellScrollView gestureRecognizerShouldBegin:] + 354 12 UIKit 0x00d6d676 -[UIGestureRecognizer _shouldBegin] + 1309 13 UIKit 0x00d69f95 -[UIGestureRecognizer setState:] + 171 14 UIKit 0x00d9a9d7 -[UIPanGestureRecognizer touchesMoved:withEvent:] + 142 15 UIKit 0x00e4dd5a -[UIScrollViewPanGestureRecognizer touchesMoved:withEvent:] + 89 16 UIKit 0x00a1c148 -[UIWindow _sendGesturesForEvent:] + 649 17 UIKit 0x00a1d2e1 -[UIWindow sendEvent:] + 1021 18 UIKit 0x009eff32 -[UIApplication sendEvent:] + 242 19 UIKit 0x009d9ec3 _UIApplicationHandleEventQueue + 11455 20 CoreFoundation 0x01ad1f5f __CFRUNLOOP_IS_CALLING_OUT_TO_A_sourcE0_PERFORM_FUNCTION__ + 15 21 CoreFoundation 0x01ad18eb __CFRunLoopDosources0 + 235 22 CoreFoundation 0x01aee9be __CFRunLoopRun + 910 23 CoreFoundation 0x01aee1e3 CFRunLoopRunSpecific + 467 24 CoreFoundation 0x01aedffb CFRunLoopRunInMode + 123 25 Graphicsservices 0x02f5a2c2 GSEventRunModal + 192 26 Graphicsservices 0x02f5a0e9 GSEventRun + 104 27 UIKit 0x009dcabb UIApplicationMain + 1225 28 Recipes 0x0000257d main + 125 29 Recipes 0x000024f5 start + 53 ) >>CASE 3: Using Swipe to delete but then not deleting,with "Done" 2013-12-29 11:05:20.802 Recipes[10319:70b] Num Rows: 4 2013-12-29 11:05:20.805 Recipes[10319:70b] Num Rows: 4 -Swipe on row 2 2013-12-29 11:05:25.166 Recipes[10319:70b] setEdiTing: On 2013-12-29 11:05:25.167 Recipes[10319:70b] InserTing Add row 4 2013-12-29 11:05:25.168 Recipes[10319:70b] Num Rows: 4 +1 2013-12-29 11:05:25.168 Recipes[10319:70b] Providing Add Cell for row 4 -Hit Done 2013-12-29 11:05:27.685 Recipes[10319:70b] setEdiTing: Off 2013-12-29 11:05:27.686 Recipes[10319:70b] setEdiTing: Off Breakpoint at beginning of setEdiTingAnimated shows: #0 0x00008edb in -[RecipeDetailViewController setEdiTing:animated:] at /Users/hugh/Downloads/iPhoneCoreDataRecipes-2/Classes/RecipeDetailViewController.m:150 #1 0x00c90f1b in -[UITableViewController tableView:didEndEdiTingRowATindexPath:] () #2 0x00aadcbb in -[UITableView _sendDidEndEdiTingForIndexPath:] () #3 0x00ac4a1f in -[UITableView _endSwipeTodeleteRowDiddelete:] () #4 0x00abbdbb in -[UITableView _setEdiTing:animated:forced:] () #5 0x00abbf58 in -[UITableView setEdiTing:animated:] () #6 0x00c90982 in -[UITableViewController setEdiTing:animated:] () #7 0x00008f16 in -[RecipeDetailViewController setEdiTing:animated:] at /Users/hugh/Downloads/iPhoneCoreDataRecipes-2/Classes/RecipeDetailViewController.m:150 #8 0x00afc3ae in -[UIViewController(UINavigationControllerItem) _toggleEdiTing:] () #9 0x01853874 in -[NSObject performSELEctor:withObject:withObject:] () #10 0x009d60c2 in -[UIApplication sendAction:to:from:forEvent:] () #11 0x00caac9b in -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] () NOTE THE REcursIVE CALL TO setEdiTing:animated: AND CONTinUING LEADS TO THE CRASH: 2013-12-29 11:05:27.688 Recipes[10319:70b] deleting Add row 4 2013-12-29 11:05:27.689 Recipes[10319:70b] Num Rows: 4 2013-12-29 11:05:27.693 Recipes[10319:70b] deleting Add row 4 2013-12-29 11:05:27.694 Recipes[10319:70b] Num Rows: 4 2013-12-29 11:05:27.694 Recipes[10319:70b] *** Assertion failure in -[UITableView _endCellAnimationsWithContext:],/sourceCache/UIKit_Sim/UIKit-2903.23/UITableView.m:1076 2013-12-29 11:05:27.697 Recipes[10319:70b] *** TerminaTing app due to uncaught exception 'NSInternalInconsistencyException',reason: 'attempt to delete row 4 from section 1 which only contains 4 rows before the update' *** First throw call stack: ( 0 CoreFoundation 0x01abe5e4 __exceptionPreprocess + 180 1 libobjc.A.dylib 0x018418b6 objc_exception_throw + 44 2 CoreFoundation 0x01abe448 +[NSException raise:format:arguments:] + 136 3 Foundation 0x005a3fee -[NSAssertionHandler handleFailureInMethod:object:file:linenumber:description:] + 116 4 UIKit 0x00aa3373 -[UITableView _endCellAnimationsWithContext:] + 3952 5 UIKit 0x00ab4caa -[UITableView endupdatesWithContext:] + 51 6 UIKit 0x00ab4cd8 -[UITableView endupdates] + 41 7 Recipes 0x000091fc -[RecipeDetailViewController setEdiTing:animated:] + 908 8 UIKit 0x00afc3ae -[UIViewController(UINavigationControllerItem) _toggleEdiTing:] + 73 9 libobjc.A.dylib 0x01853874 -[NSObject performSELEctor:withObject:withObject:] + 77 10 UIKit 0x009d60c2 -[UIApplication sendAction:to:from:forEvent:] + 108 11 UIKit 0x00caac9b -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 139 12 libobjc.A.dylib 0x01853874 -[NSObject performSELEctor:withObject:withObject:] + 77 13 UIKit 0x009d60c2 -[UIApplication sendAction:to:from:forEvent:] + 108 14 UIKit 0x009d604e -[UIApplication sendAction:@R_33_10586@rget:fromSender:forEvent:] + 61 15 UIKit 0x00ace0c1 -[UIControl sendAction:to:forEvent:] + 66 16 UIKit 0x00ace484 -[UIControl _sendActionsForEvents:withEvent:] + 577 17 UIKit 0x00acd733 -[UIControl touchesEnded:withEvent:] + 641 18 UIKit 0x00a1351d -[UIWindow _sendTouchesForEvent:] + 852 19 UIKit 0x00a14184 -[UIWindow sendEvent:] + 1232 20 UIKit 0x009e7e86 -[UIApplication sendEvent:] + 242 21 UIKit 0x009d218f _UIApplicationHandleEventQueue + 11421 22 CoreFoundation 0x01a4783f __CFRUNLOOP_IS_CALLING_OUT_TO_A_sourcE0_PERFORM_FUNCTION__ + 15 23 CoreFoundation 0x01a471cb __CFRunLoopDosources0 + 235 24 CoreFoundation 0x01a6429e __CFRunLoopRun + 910 25 CoreFoundation 0x01a63ac3 CFRunLoopRunSpecific + 467 26 CoreFoundation 0x01a638db CFRunLoopRunInMode + 123 27 Graphicsservices 0x02eae9e2 GSEventRunModal + 192 28 Graphicsservices 0x02eae809 GSEventRun + 104 29 UIKit 0x009d4d3b UIApplicationMain + 1225 30 Recipes 0x00001ced main + 125 31 Recipes 0x00001c65 start + 53
在tableView：commitEdiTingStyle：ediTingStyle：forRowATindexPath：中,在swipe-to-delete的情况下,我们知道’self.ediTing’此时为NO,所以如果你在deleteRows之后添加一个hack调用’self.ediTing’,tableView似乎更新了它的内部numberOfRows.具体来说,之后：
[self.tableView deleteRowsATindexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationTop];
加：
if (!self.ediTing) self.ediTing = NO;
其次,在setEdiTing：animated：中,在删除之前检查附加的“Add Item”行是否实际存在.具体来说,替换：
} else { [self.tableView deleteRowsATindexPaths:ingredientsInserTindexPath withRowAnimation:UITableViewRowAnimationTop]; overviewTextField.placeholder = @""; }
有：
} else { if (ingredientsCount < [self.tableView numberOfRowsInSection:INGREDIENTS_SECTION]) { [self.tableView deleteRowsATindexPaths:ingredientsInserTindexPath withRowAnimation:UITableViewRowAnimationTop]; } overviewTextField.placeholder = @""; }
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