ios 无法将具有标识符的单元格出列
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时间：2020-08-30 23:21:45 来源:igfitidea点击:
Unable to dequeue a cell with identifier
提问by thirdage
here's the method causing the problem:
这是导致问题的方法：
-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"TableCell";
TableCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier
forIndexPath:indexPath];
// Configure the cell...
int row = [indexPath row];
Books *book = [myBooks objectAtIndex:row];
cell.bookName.text = book.bookName;
return cell;
}
full log:
完整日志：
2014-02-05 23:19:09.458 Books[1425:a0b] *** Assertion failure in -[UITableView dequeueReusableCellWithIdentifier:forIndexPath:], /SourceCache/UIKit_Sim/UIKit-2903.2/UITableView.m:5251
2014-02-05 23:19:09.471 Books[1425:a0b] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'unable to dequeue a cell with identifier TableCell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard'
*** 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 0x0109d23e -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 116
4 UIKit 0x003135e3 -[UITableView dequeueReusableCellWithIdentifier:forIndexPath:] + 170
5 Books 0x000032df -[TableViewController tableView:cellForRowAtIndexPath:] + 127
6 UIKit 0x0031dd2f -[UITableView _createPreparedCellForGlobalRow:withIndexPath:] + 412
7 UIKit 0x0031de03 -[UITableView _createPreparedCellForGlobalRow:] + 69
8 UIKit 0x00302124 -[UITableView _updateVisibleCellsNow:] + 2378
9 UIKit 0x003155a5 -[UITableView layoutSubviews] + 213
10 UIKit 0x00299dd7 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 355
11 libobjc.A.dylib 0x014ce81f -[NSObject performSelector:withObject:] + 70
12 QuartzCore 0x03af372a -[CALayer layoutSublayers] + 148
13 QuartzCore 0x03ae7514 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
14 QuartzCore 0x03af3675 -[CALayer layoutIfNeeded] + 160
15 UIKit 0x00354ca3 -[UIViewController window:setupWithInterfaceOrientation:] + 304
16 UIKit 0x00273d27 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:isRotating:] + 5212
17 UIKit 0x002728c6 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:] + 82
18 UIKit 0x00272798 -[UIWindow _setRotatableViewOrientation:updateStatusBar:duration:force:] + 117
19 UIKit 0x00272820 -[UIWindow _setRotatableViewOrientation:duration:force:] + 67
20 UIKit 0x002718ba __57-[UIWindow _updateToInterfaceOrientation:duration:force:]_block_invoke + 120
21 UIKit 0x0027181c -[UIWindow _updateToInterfaceOrientation:duration:force:] + 400
22 UIKit 0x00272573 -[UIWindow setAutorotates:forceUpdateInterfaceOrientation:] + 870
23 UIKit 0x00275b66 -[UIWindow setDelegate:] + 449
24 UIKit 0x00346dc7 -[UIViewController _tryBecomeRootViewControllerInWindow:] + 180
25 UIKit 0x0026b7cc -[UIWindow addRootViewControllerViewIfPossible] + 609
26 UIKit 0x0026b947 -[UIWindow _setHidden:forced:] + 312
27 UIKit 0x0026bbdd -[UIWindow _orderFrontWithoutMakingKey] + 49
28 UIKit 0x0027644a -[UIWindow makeKeyAndVisible] + 65
29 UIKit 0x002298e0 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1851
30 UIKit 0x0022dfb8 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 824
31 UIKit 0x0024242c -[UIApplication handleEvent:withNewEvent:] + 3447
32 UIKit 0x00242999 -[UIApplication sendEvent:] + 85
33 UIKit 0x0022fc35 _UIApplicationHandleEvent + 736
34 GraphicsServices 0x0368c2eb _PurpleEventCallback + 776
35 GraphicsServices 0x0368bdf6 PurpleEventCallback + 46
36 CoreFoundation 0x016b4dd5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
37 CoreFoundation 0x016b4b0b __CFRunLoopDoSource1 + 523
38 CoreFoundation 0x016df7ec __CFRunLoopRun + 2156
39 CoreFoundation 0x016deb33 CFRunLoopRunSpecific + 467
40 CoreFoundation 0x016de94b CFRunLoopRunInMode + 123
41 UIKit 0x0022d6ed -[UIApplication _run] + 840
42 UIKit 0x0022f94b UIApplicationMain + 1225
43 Books 0x000038bd main + 141
44 libdyld.dylib 0x01d75725 start + 0
45 ??? 0x00000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
回答by bsarr007
You can directly set the identifier using the storyboard like this.
您可以像这样使用故事板直接设置标识符。
回答by Dima
From the documentation:
从文档：
Important: You must register a class or nib file using the registerNib:forCellReuseIdentifier: or registerClass:forCellReuseIdentifier: method before calling this method.
重要提示：在调用此方法之前，您必须使用 registerNib:forCellReuseIdentifier: 或 registerClass:forCellReuseIdentifier: 方法注册一个类或 nib 文件。
You need to register the cell as a usable class for that identifier. Call this after you initialize your UITableView(probably in viewDidLoad)
您需要将该单元格注册为该标识符的可用类。在初始化您的UITableView（可能在viewDidLoad）后调用它
[self.tableView registerClass:[TableCell class] forCellReuseIdentifier:CellIdentifier]
This assumes CellIdentifierhas been moved somewhere where it can be accessed from here.
这假设CellIdentifier已被移动到可以从这里访问的某个地方。
回答by Gago
Try this:
尝试这个：
-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"TableCell";
TableCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(!cell)
{
cell = [[[TableCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell...
int row = [indexPath row];
Books *book = [myBooks objectAtIndex:row];
cell.bookName.text = book.bookName;
return cell;
}
