TableView异常failed to obtain a cell from its dataSource

最新推荐文章于 2022-03-04 14:30:11 发布

番薯大佬

最新推荐文章于 2022-03-04 14:30:11 发布

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分类专栏： iOS 开发问题集

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本文分析了UITableView在尝试获取未正确初始化的cell时引发的闪退问题。通过详细阐述异常堆栈跟踪信息，指出了cell初始化不当的具体原因，并强调了在实现多类型cell时检查所有类型的重要性。

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通常是cell初始化为结果返回nil导致闪退异常。

只要排查cell的初始化方法就可以了。但如果是多个类型的cell区分并且实例化时，一定要注意检查每个类型是否都包含在里面，我就是因为少了一个类型所以一直没发现问题，总认为自己初始化cell的方法没有问题。

细心、细心、细心。重要的事情说三遍。

017-01-06 16:56:12.948 VSTMALL[9971:225217] *** Assertion failure in -[VSTOrderDetailsTableView _configureCellForDisplay:forIndexPath:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3512.30.14/UITableView.m:7962
2017-01-06 16:56:13.009 VSTMALL[9971:225217] UMLOG: error: session_id=1C71ACC182677983147A2013A199D367, context=UITableView (<VSTOrderDetailsTableView: 0x7f8305145000; baseClass = UITableView; frame = (0 0; 320 460); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x7f8306a78fe0>; layer = <CALayer: 0x7f8306a70c00>; contentOffset: {0, 0}; contentSize: {320, 248}>) failed to obtain a cell from its dataSource (<VSTOrderDetailsTableView: 0x7f8305145000; baseClass = UITableView; frame = (0 0; 320 460); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x7f8306a78fe0>; layer = <CALayer: 0x7f8306a70c00>; contentOffset: {0, 0}; contentSize: {320, 248}>)
(null)
((
	0   CoreFoundation                      0x0000000109e91e65 __exceptionPreprocess + 165
	1   libobjc.A.dylib                     0x00000001098dedeb objc_exception_throw + 48
	2   CoreFoundation                      0x0000000109e91cca +[NSException raise:format:arguments:] + 106
	3   Foundation                          0x00000001069814de -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 198
	4   UIKit                               0x0000000107827049 -[UITableView _configureCellForDisplay:forIndexPath:] + 225
	5   UIKit                               0x0000000107832e6d -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 808
	6   UIKit                               0x0000000107832f7b -[UITableView _createPreparedCellForGlobalRow:willDisplay:] + 74
	7   UIKit                               0x0000000107807a39 -[UITableView _updateVisibleCellsNow:isRecursive:] + 2996
	8   UIKit                               0x000000010783c01c -[UITableView _performWithCachedTraitCollection:] + 92
	9   UIKit                               0x0000000107822edc -[UITableView layoutSubviews] + 224
	10  UIKit                               0x00000001077904a3 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 703
	11  QuartzCore                          0x00000001097ba59a -[CALayer layoutSublayers] + 146
	12  QuartzCore                          0x00000001097aee70 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
	13  QuartzCore                          0x00000001097aecee _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
	14  QuartzCore                          0x00000001097a3475 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 277
	15  QuartzCore                          0x00000001097d0c0a _ZN2CA11Transaction6commitEv + 486
	16  QuartzCore                          0x00000001097d137c _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 92
	17  CoreFoundation                      0x0000000109dbd367 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
	18  CoreFoundation                      0x0000000109dbd2d7 __CFRunLoopDoObservers + 391
	19  CoreFoundation                      0x0000000109db2f2b __CFRunLoopRun + 1147
	20  CoreFoundation                      0x0000000109db2828 CFRunLoopRunSpecific + 488
	21  GraphicsServices                    0x000000010caa2ad2 GSEventRunModal + 161
	22  UIKit                               0x00000001076d9610 UIApplicationMain + 171
	23  VSTMALL                             0x0000000104b6b73f main + 111
	24  libdyld.dylib                       0x000000010af5e92d start + 1
	25  ???                                 0x0000000000000001 0x0 + 1
)