使用UISearchDisplayController是否可以在不调用实际行数的数据源的情况下进行tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath方法调用？
这是崩溃的堆栈跟踪（iOS 7.1.2）：
Hardware Model: iPhone4,1
Application Specific Information:
*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array'
Last Exception Backtrace:
0 CoreFoundation 0x3085df83 __exceptionPreprocess + 131
1 libobjc.A.dylib 0x3b0d8ccf objc_exception_throw + 36
2 CoreFoundation 0x307947cb -[__NSArrayM objectAtIndex:] + 228
3 MyApp 0x0016cbb3 -[BaseContactsViewController tableView:cellForRowAtIndexPath:] (BaseContactsViewController.m:338)
4 UIKit 0x331ad8f7 -[UITableView _createPreparedCellForGlobalRow:withIndexPath:] + 408
5 UIKit 0x33154c27 -[UITableView _updateVisibleCellsNow:] + 1804
6 UIKit 0x33147c5d -[UITableView _setNeedsVisibleCellsUpdate:withFrames:] + 166
7 UIKit 0x33147ba3 -[UITableView _rectChangedWithNewSize:oldSize:] + 480
8 UIKit 0x331541cd -[UITableView setBounds:] + 262
9 UIKit 0x3317066d -[UIView(Geometry) _applyISEngineLayoutValues] + 278
10 UIKit 0x33094549 -[UIView(Geometry) _resizeWithOldSuperviewSize:] + 162
11 UIKit 0x33172ca3 -[UIScrollView _resizeWithOldSuperviewSize:] + 40
12 CoreFoundation 0x307a2abd __53-[__NSArrayM enumerateObjectsWithOptions:usingBlock:]_block_invoke + 90
13 CoreFoundation 0x307a29cb -[__NSArrayM enumerateObjectsWithOptions:usingBlock:] + 196
14 UIKit 0x330851bd -[UIView(Geometry) resizeSubviewsWithOldSize:] + 118
15 UIKit 0x331712e9 -[UIView(AdditionalLayoutSupport) _is_layout] + 134
16 UIKit 0x3307afc1 -[UIView(Hierarchy) layoutSubviews] + 70
17 UIKit 0x3307ad59 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 378
18 QuartzCore 0x32cf862b -[CALayer layoutSublayers] + 140
19 QuartzCore 0x32cf3e3b CA::Layer::layout_if_needed(CA::Transaction*) + 348
20 UIKit 0x3308fe8b -[UIView(Hierarchy) layoutBelowIfNeeded] + 548
21 UIKit 0x33129eeb -[UINavigationController _layoutViewController:] + 808
22 UIKit 0x331ddcc5 -[UINavigationController _setNavigationBarHidden:edge:duration:] + 1270
23 UIKit 0x3326c011 -[UINavigationController _setNavigationBarHidden:edgeIfNotNavigating:duration:] + 530
24 UIKit 0x33196109 -[UISearchDisplayController setActive:animated:] + 8614
25 UIKit 0x3326abcd -[UISearchDisplayController searchBarTextDidBeginEditing:] + 246
26 UIKit 0x3326aaaf -[UISearchBar(UISearchBarStatic) _searchFieldBeginEditing] + 88
27 UIKit 0x330b0037 -[UIApplication sendAction:to:from:forEvent:] + 88
28 UIKit 0x330affd7 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 28
29 UIKit 0x330affb1 -[UIControl sendAction:to:forEvent:] + 42
30 UIKit 0x3309b717 -[UIControl _sendActionsForEvents:withEvent:] + 372
31 UIKit 0x3309acfd -[UITextField willAttachFieldEditor:] + 666
32 UIKit 0x33097805 -[UIFieldEditor becomeFieldEditorForView:] + 818
33 UIKit 0x33176f15 -[UITextField _becomeFirstResponder] + 158
34 UIKit 0x3326a91f -[UISearchBarTextField _becomeFirstResponder] + 76
35 UIKit 0x330f9127 -[UIResponder becomeFirstResponder] + 360
36 UIKit 0x330f93e7 -[UIView(Hierarchy) becomeFirstResponder] + 104
37 UIKit 0x33175c17 -[UITextField becomeFirstResponder] + 44
38 UIKit 0x333fe579 -[UISearchBar(UISearchBarStatic) becomeFirstResponder] + 34
39 UIKit 0x33200fed _UIGestureRecognizerSendActions + 194
40 UIKit 0x330ac4e3 -[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:] + 1136
41 UIKit 0x33453aed ___UIGestureRecognizerUpdate_block_invoke + 46
42 UIKit 0x33073353 _UIGestureRecognizerRemoveObjectsFromArrayAndApplyBlocks + 216
43 UIKit 0x33071a9b _UIGestureRecognizerUpdate + 280
44 UIKit 0x330aad49 -[UIWindow _sendGesturesForEvent:] + 770
45 UIKit 0x330aa66f -[UIWindow sendEvent:] + 664
46 UIKit 0x3307f8cd -[UIApplication sendEvent:] + 194
47 UIKit 0x3307df77 _UIApplicationHandleEventQueue + 7100
48 CoreFoundation 0x3082920b __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 12
49 CoreFoundation 0x308286db __CFRunLoopDoSources0 + 204
50 CoreFoundation 0x30826ecf __CFRunLoopRun + 620
51 CoreFoundation 0x30791ebf CFRunLoopRunSpecific + 520
52 CoreFoundation 0x30791ca3 CFRunLoopRunInMode + 104
53 GraphicsServices 0x356eb663 GSEventRunModal + 136
54 UIKit 0x330de14d UIApplicationMain + 1134
55 MyApp 0x0013f55b main (main.m:16)
56 libdyld.dylib 0x3b5e5ab7 start + 0
根据我的理解，搜索栏编辑字段中有一个点按，并开始搜索。如果我们从数据源获得正确的行数，则不可能出现此类异常。所以我的建议是数据源没有要求行数。
以下是我的数据源实现：
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (_searchDisplayController.active)
{
// return number of search items
}
// return number of regular items in section
}
我使用active属性来了解我是否需要提供多个搜索项而不是常规项。我的另一个建议是，由于某种原因，搜索控制器在数据源调用时没有激活，但在表委托调用时是活动的。
答案 0 :(得分：0)
是。对于tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath，您只需返回一个空单元格而不表示数据源。
tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
return cell;
}
您的崩溃是由BaseContactsViewController.m:338引起的。您正尝试从空数据集中获取索引0处的对象。你在那条线上有什么？