我刚开始创建新的核对清单应用程序。
到目前为止，我已将一个Table View对象和Table View Cell对象添加到main.storyboard中应用程序的UI中。
然后我转到我的View Controller头文件，并确保将超类类型更改为“UITableViewController”。
然后我转到我的View Controller主文件并添加了以下方法：
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 1;
}
-(UITableViewCell *)tableview:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"ChecklistItem"];
return cell;
}
我一直收到断点错误，无法让应用程序在iPhone模拟器上运行。我尝试从头开始并重新创建这个应用程序3次，并尝试使用不同的模拟器，但仍然没有任何工作。
每当我尝试运行应用程序时，这是调试控制台中的最终输出：
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
此外，这里有一个链接，指向我尝试运行程序并获取断点错误时我的xcode的截图：http://oi40.tinypic.com/25im3kn.jpg
我过去曾多次遇到过断点错误，但通常可以通过调试＆gt;来解决所有问题。停用断点但这对我现在不起作用。
非常感谢任何帮助。谢谢。
PS。此外，这是调试控制台日志中的整个输出：
2013-12-18 18:25:55.183 Checklists[4910:70b] *** Assertion failure in -[UITableView _configureCellForDisplay:forIndexPath:], /SourceCache/UIKit_Sim/UIKit- 2903.23/UITableView.m:6246
2013-12-18 18:25:55.190 Checklists[4910:70b] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath:'
*** First throw call stack:
(
0 CoreFoundation 0x017385e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x014bb8b6 objc_exception_throw + 44
2 CoreFoundation 0x01738448 +[NSException raise:format:arguments:] + 136
3 Foundation 0x0109bfee -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 116
4 UIKit 0x003123d5 __53-[UITableView _configureCellForDisplay:forIndexPath:]_block_invoke + 426
5 UIKit 0x0028b3ef +[UIView(Animation) performWithoutAnimation:] + 82
6 UIKit 0x0028b438 +[UIView(Animation) _performWithoutAnimation:] + 40
7 UIKit 0x00312226 -[UITableView _configureCellForDisplay:forIndexPath:] + 108
8 UIKit 0x0031863d -[UITableView _createPreparedCellForGlobalRow:withIndexPath:] + 442
9 UIKit 0x003186f3 -[UITableView _createPreparedCellForGlobalRow:] + 69
10 UIKit 0x002fc774 -[UITableView _updateVisibleCellsNow:] + 2378
11 UIKit 0x0030fe95 -[UITableView layoutSubviews] + 213
12 UIKit 0x00294267 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 355
13 libobjc.A.dylib 0x014cd81f -[NSObject performSelector:withObject:] + 70
14 QuartzCore 0x03b462ea -[CALayer layoutSublayers] + 148
15 QuartzCore 0x03b3a0d4 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
16 QuartzCore 0x03b46235 -[CALayer layoutIfNeeded] + 160
17 UIKit 0x0034f613 -[UIViewController window:setupWithInterfaceOrientation:] + 304
18 UIKit 0x0026e177 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:isRotating:] + 5212
19 UIKit 0x0026cd16 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:] + 82
20 UIKit 0x0026cbe8 -[UIWindow _setRotatableViewOrientation:updateStatusBar:duration:force:] + 117
21 UIKit 0x0026cc70 -[UIWindow _setRotatableViewOrientation:duration:force:] + 67
22 UIKit 0x0026bd0a __57-[UIWindow _updateToInterfaceOrientation:duration:force:]_block_invoke + 120
23 UIKit 0x0026bc6c -[UIWindow _updateToInterfaceOrientation:duration:force:] + 400
24 UIKit 0x0026c9c3 -[UIWindow setAutorotates:forceUpdateInterfaceOrientation:] + 870
25 UIKit 0x0026ffb6 -[UIWindow setDelegate:] + 449
26 UIKit 0x00341737 -[UIViewController _tryBecomeRootViewControllerInWindow:] + 180
27 UIKit 0x00265c1c -[UIWindow addRootViewControllerViewIfPossible] + 609
28 UIKit 0x00265d97 -[UIWindow _setHidden:forced:] + 312
29 UIKit 0x0026602d -[UIWindow _orderFrontWithoutMakingKey] + 49
30 UIKit 0x0027089a -[UIWindow makeKeyAndVisible] + 65
31 UIKit 0x00223cd0 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1851
32 UIKit 0x002283a8 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 824
33 UIKit 0x0023c87c -[UIApplication handleEvent:withNewEvent:] + 3447
34 UIKit 0x0023cde9 -[UIApplication sendEvent:] + 85
35 UIKit 0x0022a025 _UIApplicationHandleEvent + 736
36 GraphicsServices 0x036df2f6 _PurpleEventCallback + 776
37 GraphicsServices 0x036dee01 PurpleEventCallback + 46
38 CoreFoundation 0x016b3d65 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
39 CoreFoundation 0x016b3a9b __CFRunLoopDoSource1 + 523
40 CoreFoundation 0x016de77c __CFRunLoopRun + 2156
41 CoreFoundation 0x016ddac3 CFRunLoopRunSpecific + 467
42 CoreFoundation 0x016dd8db CFRunLoopRunInMode + 123
43 UIKit 0x00227add -[UIApplication _run] + 840
44 UIKit 0x00229d3b UIApplicationMain + 1225
45 Checklists 0x00001b7d main + 141
46 libdyld.dylib 0x01d7670d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
PPS。进行更改后，我的视图控制器主文件现在看起来像这样：
#import "ChecklistsViewController.h"
@interface ChecklistsViewController ()
@end
@implementation ChecklistsViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 1;
}
-(UITableViewCell *)tableview:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"ChecklistItem"]; if(!cell) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"ChecklistItem"]; }
return cell;
}
@end
我仍然收到错误，现在这是控制台日志显示的内容：
2013-12-18 18:42:14.609 Checklists[5014:70b] *** Assertion failure in -[UITableView _configureCellForDisplay:forIndexPath:], /SourceCache/UIKit_Sim/UIKit- 2903.23/UITableView.m:6246
2013-12-18 18:42:14.614 Checklists[5014:70b] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath:'
*** First throw call stack:
(
0 CoreFoundation 0x017395e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x014bc8b6 objc_exception_throw + 44
2 CoreFoundation 0x01739448 +[NSException raise:format:arguments:] + 136
3 Foundation 0x0109cfee -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 116
4 UIKit 0x003133d5 __53-[UITableView _configureCellForDisplay:forIndexPath:]_block_invoke + 426
5 UIKit 0x0028c3ef +[UIView(Animation) performWithoutAnimation:] + 82
6 UIKit 0x0028c438 +[UIView(Animation) _performWithoutAnimation:] + 40
7 UIKit 0x00313226 -[UITableView _configureCellForDisplay:forIndexPath:] + 108
8 UIKit 0x0031963d -[UITableView _createPreparedCellForGlobalRow:withIndexPath:] + 442
9 UIKit 0x003196f3 -[UITableView _createPreparedCellForGlobalRow:] + 69
10 UIKit 0x002fd774 -[UITableView _updateVisibleCellsNow:] + 2378
11 UIKit 0x00310e95 -[UITableView layoutSubviews] + 213
12 UIKit 0x00295267 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 355
13 libobjc.A.dylib 0x014ce81f -[NSObject performSelector:withObject:] + 70
14 QuartzCore 0x03b472ea -[CALayer layoutSublayers] + 148
15 QuartzCore 0x03b3b0d4 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
16 QuartzCore 0x03b47235 -[CALayer layoutIfNeeded] + 160
17 UIKit 0x00350613 -[UIViewController window:setupWithInterfaceOrientation:] + 304
18 UIKit 0x0026f177 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:isRotating:] + 5212
19 UIKit 0x0026dd16 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:] + 82
20 UIKit 0x0026dbe8 -[UIWindow _setRotatableViewOrientation:updateStatusBar:duration:force:] + 117
21 UIKit 0x0026dc70 -[UIWindow _setRotatableViewOrientation:duration:force:] + 67
22 UIKit 0x0026cd0a __57-[UIWindow _updateToInterfaceOrientation:duration:force:]_block_invoke + 120
23 UIKit 0x0026cc6c -[UIWindow _updateToInterfaceOrientation:duration:force:] + 400
24 UIKit 0x0026d9c3 -[UIWindow setAutorotates:forceUpdateInterfaceOrientation:] + 870
25 UIKit 0x00270fb6 -[UIWindow setDelegate:] + 449
26 UIKit 0x00342737 -[UIViewController _tryBecomeRootViewControllerInWindow:] + 180
27 UIKit 0x00266c1c -[UIWindow addRootViewControllerViewIfPossible] + 609
28 UIKit 0x00266d97 -[UIWindow _setHidden:forced:] + 312
29 UIKit 0x0026702d -[UIWindow _orderFrontWithoutMakingKey] + 49
30 UIKit 0x0027189a -[UIWindow makeKeyAndVisible] + 65
31 UIKit 0x00224cd0 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1851
32 UIKit 0x002293a8 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 824
33 UIKit 0x0023d87c -[UIApplication handleEvent:withNewEvent:] + 3447
34 UIKit 0x0023dde9 -[UIApplication sendEvent:] + 85
35 UIKit 0x0022b025 _UIApplicationHandleEvent + 736
36 GraphicsServices 0x036e02f6 _PurpleEventCallback + 776
37 GraphicsServices 0x036dfe01 PurpleEventCallback + 46
38 CoreFoundation 0x016b4d65 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
39 CoreFoundation 0x016b4a9b __CFRunLoopDoSource1 + 523
40 CoreFoundation 0x016df77c __CFRunLoopRun + 2156
41 CoreFoundation 0x016deac3 CFRunLoopRunSpecific + 467
42 CoreFoundation 0x016de8db CFRunLoopRunInMode + 123
43 UIKit 0x00228add -[UIApplication _run] + 840
44 UIKit 0x0022ad3b UIApplicationMain + 1225
45 Checklists 0x00002aed main + 141
46 libdyld.dylib 0x01d7770d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
答案 0 :(得分：2)
问题是代码dequeueReusableCellWithIdentifier没有返回单元格。
"ChecklistItem" 如果dequeueReusableCellWithIdentifier返回nil，则会创建一个新单元格。
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"ChecklistItem"];
if(!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"ChecklistItem"];
}
那应该解决你的问题。