更新 2
用户点击 ViewController1 中的按钮后，我的应用程序在模态显示时崩溃。在我的故事板中，我有一个标准的present modallysegue 设置来弹出 UINavController/UITableViewController 包含UISearchBar. 每次都这样失败。
但是，在我的 中AppDelegate，如果我将窗口设置rootViewController为相同的 UINavController/UITableViewController，一切都会按预期工作。
出于某种原因，通过 segue 转换然后执行 UISearchBar 会导致崩溃。
更新 1
点击一个字母时，我现在收到以下错误：
2015-02-03 12:23:35.262 Afar D[28348:2740681] -[NSNull length]: unrecognized selector sent to instance 0x10e352ce0
2015-02-03 12:23:40.313 Afar D[28348:2740681] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSNull length]: unrecognized selector sent to instance 0x10e352ce0'
*** First throw call stack:
(
0 CoreFoundation 0x000000010e0a9f35 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010dd42bb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010e0b104d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3 CoreFoundation 0x000000010e00927c ___forwarding___ + 988
4 CoreFoundation 0x000000010e008e18 _CF_forwarding_prep_0 + 120
5 CoreFoundation 0x000000010df89a7b CFStringCompareWithOptionsAndLocale + 219
6 Foundation 0x000000010d6822b7 -[NSString compare:options:range:] + 29
7 UIKit 0x000000010c5f53b4 -[UIPhysicalKeyboardEvent _matchesKeyCommand:] + 224
8 UIKit 0x000000010c53c12e -[UIResponder(Internal) _keyCommandForEvent:] + 285
9 UIKit 0x000000010c53c197 -[UIResponder(Internal) _keyCommandForEvent:] + 390
10 UIKit 0x000000010c53c197 -[UIResponder(Internal) _keyCommandForEvent:] + 390
11 UIKit 0x000000010c53c197 -[UIResponder(Internal) _keyCommandForEvent:] + 390
12 UIKit 0x000000010c53c197 -[UIResponder(Internal) _keyCommandForEvent:] + 390
13 UIKit 0x000000010c53c197 -[UIResponder(Internal) _keyCommandForEvent:] + 390
14 UIKit 0x000000010c53c197 -[UIResponder(Internal) _keyCommandForEvent:] + 390
15 UIKit 0x000000010c53c197 -[UIResponder(Internal) _keyCommandForEvent:] + 390
16 UIKit 0x000000010c3d8f0a -[UIApplication _handleKeyUIEvent:] + 126
17 UIKit 0x000000010c5c7fcc -[UIKeyboardImpl _handleKeyEvent:executionContext:] + 66
18 UIKit 0x000000010c75bbb7 -[UIKeyboardLayoutStar completeRetestForTouchUp:timestamp:interval:executionContext:] + 3611
19 UIKit 0x000000010c75a8e5 -[UIKeyboardLayoutStar touchUp:executionContext:] + 1374
20 UIKit 0x000000010c5d531b __28-[UIKeyboardLayout touchUp:]_block_invoke + 242
21 UIKit 0x000000010cb23914 -[UIKeyboardTaskQueue continueExecutionOnMainThread] + 332
22 UIKit 0x000000010c5d521c -[UIKeyboardLayout touchUp:] + 252
23 UIKit 0x000000010c5d5cc6 -[UIKeyboardLayout touchesEnded:withEvent:] + 319
24 UIKit 0x000000010c40b308 -[UIWindow _sendTouchesForEvent:] + 735
25 UIKit 0x000000010c40bc33 -[UIWindow sendEvent:] + 683
26 UIKit 0x000000010c3d89b1 -[UIApplication sendEvent:] + 246
27 UIKit 0x000000010c3e5a7d _UIApplicationHandleEventFromQueueEvent + 17370
28 UIKit 0x000000010c3c1103 _UIApplicationHandleEventQueue + 1961
29 CoreFoundation 0x000000010dfdf551 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
30 CoreFoundation 0x000000010dfd541d __CFRunLoopDoSources0 + 269
31 CoreFoundation 0x000000010dfd4a54 __CFRunLoopRun + 868
32 CoreFoundation 0x000000010dfd4486 CFRunLoopRunSpecific + 470
33 GraphicsServices 0x000000010fc109f0 GSEventRunModal + 161
34 UIKit 0x000000010c3c4420 UIApplicationMain + 1282
35 My App 0x000000010a5e1c63 main + 115
36 libdyld.dylib 0x000000010e75a145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
我正在使用 iOS8 的新功能UISearchController来管理UISearchBar用于过滤表格中的数据。如果我激活UISearchBar，应用程序会在我输入第一个字母时立即崩溃（有趣的是，屏幕键盘不会出现在模拟器中，但我认为这不相关）。
为了缩小范围，我已经评论了我的几乎所有内容，UIViewController以便UITableView什么都不渲染。我已经实现了UISearchControllerDelegate，UISearchBarDelegate这样我就可以在调用每个方法时进行记录。但是，在输入第一个字母后，我没有收到任何控制台消息。我什至不知道我可以在哪里设置断点。
这是我得到的崩溃：
-[NSNull length]: unrecognized selector sent to instance 0x107602ce0
请注意，在我的文件中，我没有在任何地方调用长度。幕后的东西是，但我不知道是什么。
这是我设置 UISearchController 的代码：
- (void)viewDidLoad
{
[super viewDidLoad];
self.searchController = [[UISearchController alloc] initWithSearchResultsController:nil];
self.searchController.searchResultsUpdater = self;
self.searchController.definesPresentationContext = true;
self.searchController.hidesNavigationBarDuringPresentation = false;
[self.searchController.searchBar sizeToFit];
self.tableView.tableHeaderView = self.searchController.searchBar;
self.searchController.searchBar.delegate = self;
self.searchController.delegate = self;
}
根据要求，这是我的委托方法（实施只是为了查看在输入第一个字母后是否调用了任何东西 - 他们没有）：
#pragma mark - UISearchResultsUpdating
- (void)updateSearchResultsForSearchController:(UISearchController *)searchController
{
NSLog(@"%s", __PRETTY_FUNCTION__);
}
#pragma mark - UISearchControllerDelegate
- (void)didDismissSearchController:(UISearchController *)searchController
{
NSLog(@"%s", __PRETTY_FUNCTION__);
}
- (void)didPresentSearchController:(UISearchController *)searchController
{
NSLog(@"%s", __PRETTY_FUNCTION__);
}
- (void)presentSearchController:(UISearchController *)searchController
{
NSLog(@"%s", __PRETTY_FUNCTION__);
}
- (void)willDismissSearchController:(UISearchController *)searchController
{
NSLog(@"%s", __PRETTY_FUNCTION__);
}
- (void)willPresentSearchController:(UISearchController *)searchController
{
NSLog(@"%s", __PRETTY_FUNCTION__);
}
#pragma mark - UISearchBarDelegate
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
NSLog(@"%s", __PRETTY_FUNCTION__);
}
- (BOOL)searchBar:(UISearchBar *)searchBar shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
NSLog(@"%s", __PRETTY_FUNCTION__);
return true;
}
- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar
{
NSLog(@"%s", __PRETTY_FUNCTION__);
return true;
}
- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar
{
NSLog(@"%s", __PRETTY_FUNCTION__);
}
- (BOOL)searchBarShouldEndEditing:(UISearchBar *)searchBar
{
NSLog(@"%s", __PRETTY_FUNCTION__);
return true;
}
- (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar
{
NSLog(@"%s", __PRETTY_FUNCTION__);
}