ios - 以 NSException 类型的未捕获异常终止 - 删除 TableView 行

Question

我正在使用 Swift 开发一个基于 TableView 的应用程序。我整天都在尝试删除 tableview 行，但我一直收到此异常。不确定这是什么。这里是我必须删除该行的代码。不知道还有什么可以尝试说实话。这应该是一项简单的任务，Swift 应该让我们轻松完成，但这确实阻碍了我。

代码:

override func tableView(tableView: UITableView!, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath!) {
    let appDel:AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate
    let context: NSManagedObjectContext = appDel.managedObjectContext
    if editingStyle == UITableViewCellEditingStyle.Delete {
            // do something with unwrappedIndexPath.row

            context.deleteObject(myData.objectAtIndex(indexPath.row) as NSManagedObject)
            tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)

        var error: NSError? = nil
        if !context.save(&error) {
            abort()
        }

    }
}

错误:

(
    "<MyData: 0x10bba1a90> (entity: MyData; id: 0xd0000000001c0000 <x-coredata://8A0231EE-899F-48F9-953B-CAB1252FD1D0/MyData/p7> ; data: <fault>)"
)
<MyData: 0x10d84ba20> (entity: MyData; id: 0xd000000000300000 <x-coredata://8A0231EE-899F-48F9-953B-CAB1252FD1D0/MyData/p12> ; data: {
    name = test;
    skills = te;
})
Data Saved
(
    "<MyData: 0x10bba1a90> (entity: MyData; id: 0xd0000000001c0000 <x-coredata://8A0231EE-899F-48F9-953B-CAB1252FD1D0/MyData/p7> ; data: {\n    name = Rob;\n    skills = Dev;\n})",
    "<MyData: 0x10bf1dec0> (entity: MyData; id: 0xd000000000300000 <x-coredata://8A0231EE-899F-48F9-953B-CAB1252FD1D0/MyData/p12> ; data: <fault>)"
)
2014-06-13 21:51:51.452 coreDataApp[2090:38878] *** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-3185.20/UITableView.m:1487
2014-06-13 21:51:51.487 coreDataApp[2090:38878] *** 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 (2) must be equal to the number of rows contained in that section before the update (2), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 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                      0x0000000100848e35 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x00000001022f49a0 objc_exception_throw + 45
    2   CoreFoundation                      0x0000000100848c9a +[NSException raise:format:arguments:] + 106
    3   Foundation                          0x0000000100cdb6fb -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 195
    4   UIKit                               0x0000000101190b3b -[UITableView _endCellAnimationsWithContext:] + 11785
    5   coreDataApp                         0x000000010000454c _TFC11coreDataApp23dataTableViewController9tableViewfS0_FTGSQCSo11UITableView_18commitEditingStyleOSC27UITableViewCellEditingStyle17forRowAtIndexPathGSQCSo11NSIndexPath__T_ + 2332
    6   coreDataApp                         0x0000000100004927 _TToFC11coreDataApp23dataTableViewController9tableViewfS0_FTGSQCSo11UITableView_18commitEditingStyleOSC27UITableViewCellEditingStyle17forRowAtIndexPathGSQCSo11NSIndexPath__T_ + 103
    7   UIKit                               0x00000001011b1e51 -[UITableView animateDeletionOfRowWithCell:] + 114
    8   UIKit                               0x00000001013409db -[UITableViewCell _swipeDeleteButtonPushed] + 60
    9   UIKit                               0x00000001010c4333 -[UIApplication sendAction:to:from:forEvent:] + 75
    10  UIKit                               0x00000001011c086d -[UIControl _sendActionsForEvents:withEvent:] + 467
    11  UIKit                               0x00000001011bfc3f -[UIControl touchesEnded:withEvent:] + 522
    12  UIKit                               0x000000010144efb7 _UIGestureRecognizerUpdate + 7670
    13  UIKit                               0x0000000101105d66 -[UIWindow _sendGesturesForEvent:] + 1041
    14  UIKit                               0x0000000101106993 -[UIWindow sendEvent:] + 667
    15  UIKit                               0x00000001010d7dd1 -[UIApplication sendEvent:] + 246
    16  UIKit                               0x00000001010e2dda _UIApplicationHandleEventFromQueueEvent + 11315
    17  UIKit                               0x00000001010bfc5f _UIApplicationHandleEventQueue + 1461
    18  CoreFoundation                      0x000000010077fbd1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    19  CoreFoundation                      0x000000010077522d __CFRunLoopDoSources0 + 269
    20  CoreFoundation                      0x000000010077485d __CFRunLoopRun + 861
    21  CoreFoundation                      0x0000000100774296 CFRunLoopRunSpecific + 470
    22  GraphicsServices                    0x0000000104462ce4 GSEventRunModal + 161
    23  UIKit                               0x00000001010c3308 UIApplicationMain + 2994
    24  coreDataApp                         0x00000001000096ad top_level_code + 77
    25  coreDataApp                         0x00000001000096ea main + 42
    26  libdyld.dylib                       0x0000000102852145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

Answer 1

您忘记从数据模型中删除对象

myData.removeObjectAtIndex(indexPath!.row)

这不是真正的 Swift 问题，在 Obj-C 中也会发生同样的问题。