在iOS7中测试我的应用程序时遇到了一个问题。该应用程序目前在iOS5和iOS6中运行良好。基于堆栈跟踪，看起来私有方法会导致问题。
2013-11-21 17:00:56.565 MyApp[706:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'An override of -[UINavigationController navigationBar] is returning an object that is not a kind of UINavigationBar'
*** First throw call stack:
(
0 CoreFoundation 0x0244d5e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x01eee8b6 objc_exception_throw + 44
2 CoreFoundation 0x0244d3bb +[NSException raise:format:] + 139
3 UIKit 0x00af796c -[UINavigationController _confirmBarAccessMethods] + 277
4 UIKit 0x00af7b19 -[UINavigationController initWithNibName:bundle:] + 271
5 MyApp 0x000b8bd8 -[CustomUINavigationController initWithNibName:bundle:] + 152
6 UIKit 0x00af77b3 -[UINavigationController initWithRootViewController:] + 86
7 MyApp 0x000b8ea1 -[CustomUINavigationController initWithRootViewController:] + 113
8 MyApp 0x0000260a -[AppDelegate application:didFinishLaunchingWithOptions:] + 666
9 UIKit 0x009c7355 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 309
10 UIKit 0x009c7b95 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1536
11 UIKit 0x009cc3a8 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 824
12 UIKit 0x009e087c -[UIApplication handleEvent:withNewEvent:] + 3447
13 UIKit 0x009e0de9 -[UIApplication sendEvent:] + 85
14 UIKit 0x009ce025 _UIApplicationHandleEvent + 736
15 GraphicsServices 0x0478b2f6 _PurpleEventCallback + 776
16 GraphicsServices 0x0478ae01 PurpleEventCallback + 46
17 CoreFoundation 0x023c8d65 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
18 CoreFoundation 0x023c8a9b __CFRunLoopDoSource1 + 523
19 CoreFoundation 0x023f377c __CFRunLoopRun + 2156
20 CoreFoundation 0x023f2ac3 CFRunLoopRunSpecific + 467
21 CoreFoundation 0x023f28db CFRunLoopRunInMode + 123
22 UIKit 0x009cbadd -[UIApplication _run] + 840
23 UIKit 0x009cdd3b UIApplicationMain + 1225
24 MyApp 0x00002337 main + 295
25 MyApp 0x00002205 start + 53
)
libc++abi.dylib: terminating with uncaught exception of type NSException
只有在iOS7中进行测试时才会发生此崩溃。一旦调用[super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]，就会发生这种情况。我找不到有关_confirmBarAccessMethods的任何信息。我假设它是一个私有的UINavigationController方法。
以下是CustomUINavigationController类的头文件：
#import <UIKit/UIKit.h>
#import "CustomUINavigationBar.h"
@interface CustomUINavigationController : UINavigationController
{
CustomUINavigationBar *customNavigationBar;
}
@property (nonatomic, retain) UIColor *titleColor;
@end
这是应用程序崩溃的init方法：
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; // This line causes the application to crash
if (self) {
customNavigationBar = [[CustomUINavigationBar alloc] init];
[customNavigationBar setTintColor:[UIColor colorWithWhite:0.0 alpha:1.0]];
[customNavigationBar setItems:[NSArray array] animated:NO];
[customNavigationBar setDelegate:self];
self.titleColor = [UIColor colorWithWhite:1.0 alpha:1.0];
}
return self;
}
以下是CustomNavigationBar的标头文件：
#import <UIKit/UIKit.h>
@interface CustomUINavigationBar : UINavigationBar
{
UIImage *background;
}
@end
非常感谢任何帮助。如有必要，我可以提供更多信息。
编辑：从使用自定义导航栏初始值设定项的建议解决方案中添加了跟踪
2013-11-22 13:04:49.756 MyApp[390:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'An override of -[UINavigationController navigationBar] is returning an object that is not a kind of UINavigationBar'
*** First throw call stack:
(
0 CoreFoundation 0x0244d5e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x01eee8b6 objc_exception_throw + 44
2 CoreFoundation 0x0244d3bb +[NSException raise:format:] + 139
3 UIKit 0x00af796c -[UINavigationController _confirmBarAccessMethods] + 277
4 UIKit 0x00af7b19 -[UINavigationController initWithNibName:bundle:] + 271
5 MyApp 0x000b8e38 -[CustomUINavigationController initWithNibName:bundle:] + 152
6 UIKit 0x00af7815 -[UINavigationController initWithNavigationBarClass:toolbarClass:] + 52
7 MyApp 0x00002868 -[AppDelegate application:didFinishLaunchingWithOptions:] + 712
8 UIKit 0x009c7355 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 309
9 UIKit 0x009c7b95 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1536
10 UIKit 0x009cc3a8 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 824
11 UIKit 0x009e087c -[UIApplication handleEvent:withNewEvent:] + 3447
12 UIKit 0x009e0de9 -[UIApplication sendEvent:] + 85
13 UIKit 0x009ce025 _UIApplicationHandleEvent + 736
14 GraphicsServices 0x0478b2f6 _PurpleEventCallback + 776
15 GraphicsServices 0x0478ae01 PurpleEventCallback + 46
16 CoreFoundation 0x023c8d65 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
17 CoreFoundation 0x023c8a9b __CFRunLoopDoSource1 + 523
18 CoreFoundation 0x023f377c __CFRunLoopRun + 2156
19 CoreFoundation 0x023f2ac3 CFRunLoopRunSpecific + 467
20 CoreFoundation 0x023f28db CFRunLoopRunInMode + 123
21 UIKit 0x009cbadd -[UIApplication _run] + 840
22 UIKit 0x009cdd3b UIApplicationMain + 1225
23 MyApp 0x00002567 main + 295
24 MyApp 0x00002435 start + 53
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
答案 0 :(得分：0)
使用initWithNavigationBarClass:toolbarClass:创建导航控制器并提供自定义导航栏类。然后在导航控制器超类为您创建的实例上执行所需的任何配置。
答案 1 :(得分：0)
我终于解决了这个问题。 CustomerUINavigationController具有navigationBar访问者的覆盖方法。它试图返回一个零值。我删除了这个，编译并运行的应用程序没有任何问题。