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我有一个UIButton是在着陆时会弹出一个UIViewController查看。在viewDidLoad，应用程序用的一个异常崩溃：的iOS崩溃
- [的UILabel stringByTrimmingCharactersInSet：]：无法识别的选择发送到实例0x16674e30
这里是代码导致崩溃：
viewController.navigationController.navigationBar.barStyle = UIBarStyleBlack;
UIImage *logo = [UIImage imageNamed:backgroundImageName];
UIImageView *logoView = [[UIImageView alloc] init];
logoView.image = logo;
logoView.frame = CGRectMake(0, 0, 50, 30);
viewController.navigationItem.titleView = logoView; // crash at this line
最后一行是导致崩溃的一个。我将SWRevealController用作幻灯片左侧抽屉样式菜单。我有5其他UIViewControllers使用完全相同的代码，并正常工作，但我无法找到他们和其他类之间的任何区别。我知道这看起来可能有点模糊，但我不确定现在到了哪里来解决这个问题。任何帮助将不胜感激。
这里是在主线程崩溃的堆栈：
#0 0x378416a0 in objc_exception_throw()
#1 0x2d4e47b6 in -[NSObject(NSObject) doesNotRecognizeSelector:]()
#2 0x2d4e30ae in ___forwarding___()
#3 0x2d431dc8 in __forwarding_prep_0___()
#4 0x2fcfc78e in -[UINavigationItem initWithTitle:]()
#5 0x2fcfc6dc in -[UIViewController(UINavigationControllerItem) navigationItem]()
#6 0x00110b94 in -[CSUtility addleftButtonToNavItem:rightButton:background:rightButtonTitle:forViewController:revealViewController:overrideLeft:] at /Users/shawn/Documents/TruthIt/TruthIOS/TruthiOS/TruthiOS/CSUtility.m:59
#7 0x0012cd92 in -[CSQuestionDetailViewController viewDidLoad] at /Users/shawn/Documents/TruthIt/TruthIOS/TruthiOS/TruthiOS/CSQuestionDetailViewController.m:227
#8 0x2fc6995a in -[UIViewController loadViewIfRequired]()
#9 0x2fc69718 in -[UIViewController view]()
#10 0x2fdf5c2a in -[UINavigationController _startCustomTransition:]()
#11 0x2fd13a16 in -[UINavigationController _startDeferredTransitionIfNeeded:]()
#12 0x2fd13820 in -[UINavigationController __viewWillLayoutSubviews]()
#13 0x2fd137b8 in -[UILayoutContainerView layoutSubviews]()
#14 0x2fc65352 in -[UIView(CALayerDelegate) layoutSublayersOfLayer:]()
#15 0x2f8eb942 in -[CALayer layoutSublayers]()
#16 0x2f8e7166 in CA::Layer::layout_if_needed(CA::Transaction*)()
#17 0x2f8e6ff8 in CA::Layer::layout_and_display_if_needed(CA::Transaction*)()
#18 0x2f8e6a0c in CA::Context::commit_transaction(CA::Transaction*)()
#19 0x2f8e681e in CA::Transaction::commit()()
#20 0x2f8e054c in CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*)()
#21 0x2d4abf68 in __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__()
#22 0x2d4a98f6 in __CFRunLoopDoObservers()
#23 0x2d4a9c42 in __CFRunLoopRun()
#24 0x2d414470 in CFRunLoopRunSpecific()
#25 0x2d414252 in CFRunLoopRunInMode()
#26 0x321482ea in GSEventRunModal()
#27 0x2fcc9844 in UIApplicationMain()
#28 0x00111d7c in main at /Users/shawn/Documents/TruthIt/TruthIOS/TruthiOS/TruthiOS/main.m:16
这是还挺有趣的，如果切换视图代码到viewWillAppear我还是从我的代码获得崩溃只是没有。下面是堆栈跟踪：
Thread 1, Queue : com.apple.main-thread
#0 0x378416a0 in objc_exception_throw()
#1 0x2d4e47b6 in -[NSObject(NSObject) doesNotRecognizeSelector:]()
#2 0x2d4e30ae in ___forwarding___()
#3 0x2d431dc8 in __forwarding_prep_0___()
#4 0x2fcfc78e in -[UINavigationItem initWithTitle:]()
#5 0x2fcfc6dc in -[UIViewController(UINavigationControllerItem) navigationItem]()
#6 0x2fd1559a in -[UINavigationController _hasTranslucentNavigationBarIncludingViewController:]()
#7 0x2fd1542c in -[UINavigationController _shouldNavigationBarInsetViewController:orOverlayContent:]()
#8 0x2fd14c3e in -[UINavigationController _frameForViewController:]()
#9 0x2fdf5c48 in -[UINavigationController _startCustomTransition:]()
#10 0x2fd13a16 in -[UINavigationController _startDeferredTransitionIfNeeded:]()
#11 0x2fd13820 in -[UINavigationController __viewWillLayoutSubviews]()
#12 0x2fd137b8 in -[UILayoutContainerView layoutSubviews]()
#13 0x2fc65352 in -[UIView(CALayerDelegate) layoutSublayersOfLayer:]()
#14 0x2f8eb942 in -[CALayer layoutSublayers]()
#15 0x2f8e7166 in CA::Layer::layout_if_needed(CA::Transaction*)()
#16 0x2f8e6ff8 in CA::Layer::layout_and_display_if_needed(CA::Transaction*)()
#17 0x2f8e6a0c in CA::Context::commit_transaction(CA::Transaction*)()
#18 0x2f8e681e in CA::Transaction::commit()()
#19 0x2f8e054c in CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*)()
#20 0x2d4abf68 in __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__()
#21 0x2d4a98f6 in __CFRunLoopDoObservers()
#22 0x2d4a9c42 in __CFRunLoopRun()
#23 0x2d414470 in CFRunLoopRunSpecific()
#24 0x2d414252 in CFRunLoopRunInMode()
#25 0x321482ea in GSEventRunModal()
#26 0x2fcc9844 in UIApplicationMain()
#27 0x00124cf4 in main at /Users/shawn/Documents/TruthIt/TruthIOS/TruthiOS/TruthiOS/main.m:16
的想法好，谢谢rmaddy我认为你是对的东西，但我仍然没有得到它相当所有的竟然有办法。我（愚蠢地，我知道，我在这里急着编码）有一个名称标题定义的UILabel。我改变了对questionTitle，现在我收到一个不同的错误 - [的UILabel copyWithZone]无法识别的选择发送到实例，再一次在这里是堆栈跟踪：
Thread 1, Queue : com.apple.main-thread
#0 0x378416a0 in objc_exception_throw()
#1 0x2d4e47b6 in -[NSObject(NSObject) doesNotRecognizeSelector:]()
#2 0x2d4e30ae in ___forwarding___()
#3 0x2d431dc8 in __forwarding_prep_0___()
#4 0x2fcfb9a8 in -[UIViewController setTitle:]()
#5 0x2de203b6 in -[NSObject(NSKeyValueCoding) setValue:forKey:]()
#6 0x2de31ffc in -[NSObject(NSKeyValueCoding) setValue:forKeyPath:]()
#7 0x2d4507e8 in -[NSArray makeObjectsPerformSelector:]()
#8 0x2ffc44de in -[UINib instantiateWithOwner:options:]()
#9 0x2ff260fa in -[UIViewController _loadViewFromNibNamed:bundle:]()
#10 0x2fd87b58 in -[UIViewController loadView]()
#11 0x2fc6979c in -[UIViewController loadViewIfRequired]()
#12 0x2fc69718 in -[UIViewController view]()
#13 0x2fdf5c2a in -[UINavigationController _startCustomTransition:]()
#14 0x2fd13a16 in -[UINavigationController _startDeferredTransitionIfNeeded:]()
#15 0x2fd13820 in -[UINavigationController __viewWillLayoutSubviews]()
#16 0x2fd137b8 in -[UILayoutContainerView layoutSubviews]()
#17 0x2fc65352 in -[UIView(CALayerDelegate) layoutSublayersOfLayer:]()
#18 0x2f8eb942 in -[CALayer layoutSublayers]()
#19 0x2f8e7166 in CA::Layer::layout_if_needed(CA::Transaction*)()
#20 0x2f8e6ff8 in CA::Layer::layout_and_display_if_needed(CA::Transaction*)()
#21 0x2f8e6a0c in CA::Context::commit_transaction(CA::Transaction*)()
#22 0x2f8e681e in CA::Transaction::commit()()
#23 0x2f8e054c in CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*)()
#24 0x2d4abf68 in __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__()
#25 0x2d4a98f6 in __CFRunLoopDoObservers()
#26 0x2d4a9c42 in __CFRunLoopRun()
#27 0x2d414470 in CFRunLoopRunSpecific()
#28 0x2d414252 in CFRunLoopRunInMode()
#29 0x321482ea in GSEventRunModal()
#30 0x2fcc9844 in UIApplicationMain()
#31 0x0008cccc in main at /Users/shawn/Documents/TruthIt/TruthIOS/TruthiOS/TruthiOS/main.m:16
试过一个cmd-shift-k？另外，尝试在视图中包装图像视图？ – Undo
是的，我只是再试一次，没有骰子。 :( –
你可以发布你的筹码？ –