Exception handling iOS 5.0是否忽略NSSetUncaughtExceptionHandler？

我注意到iOS 5中有一些奇怪的行为：NSSetUncaughtExceptionHandler（）似乎不再做任何事情了

我有以下代码：

static NSString* documentsDirectory()
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
    return basePath;
}

static void handleException(NSException *exception)
{
    // Write something to the documents dir
    NSString* path = [documentsDirectory() stringByAppendingPathComponent:@"crashlog.txt"];
    NSString* str = @"Handled exception";
    NSError* err;
    if(![str writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:&err])
    {
        NSLog(@"Failed to write to file");
    }
    NSLog(@"Handled exception");
}


@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSSetUncaughtExceptionHandler(&handleException);
    [NSException raise:@"Test" format:@"Testing"];

    ...
}

以上代码适用于运行4.x或更早版本的任何设备或模拟器。但是，当我在5.0模拟器上运行它时，不会调用异常处理程序（不会将文件写入documents目录，不会记录，如果在处理程序中设置断点，也不会触发）

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不幸的是，我没有5.0设备可供测试，所以我希望有人能确认它在5.0上坏了，这样我就可以提交错误报告（或者纠正我，如果我的代码有问题）。

我也看到了同样的情况。它可以在我的iPad上运行，但不能在模拟器上运行。如果有人在电话中确认，请随意编辑此答案以反映这一点。

使用iOS 6.0 SDK，在模拟器5.0上构建并运行它！它起作用了

//////代码：

static NSString* documentsDirectory()
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
    return basePath;
}

static void handleException(NSException *exception)
{
    // Write something to the documents dir
    NSString* path = [documentsDirectory() stringByAppendingPathComponent:@"crashlog.txt"];
    NSString* str = @"Handled exception";
    NSError* err;
    if(![str writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:&err])
    {
        NSLog(@"Failed to write to file");
    }
    NSLog(@"Handled exception");
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSSetUncaughtExceptionHandler(&handleException);
    [NSException raise:@"Test" format:@"Testing"];

    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    self.viewController = [[[NSSetUncaughtExceptionHandlerTestViewController alloc] initWithNibName:@"NSSetUncaughtExceptionHandlerTestViewController" bundle:nil] autorelease];
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

//////终端日志：

2012-10-09 20:06:24.726 NSSetUncaughtExceptionHandlerTest[7815:c07] Handled exception
2012-10-09 20:06:24.727 NSSetUncaughtExceptionHandlerTest[7815:c07] *** Terminating app due to uncaught exception 'Test', reason: 'Testing'
*** First throw call stack:
(0x14a4052 0xea4d0a 0x144ca78 0x144c9e9 0x29d7 0x129d6 0x138a6 0x22743 0x231f8 0x16aa9 0x138efa9 0x14781c5 0x13dd022 0x13db90a 0x13dadb4 0x13daccb 0x132a7 0x14a9b 0x28b2 0x27e5)
terminate called throwing an exception(lldb) 

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更新：刚接触到一台iOS 5设备，这个问题似乎只影响模拟器，而不是设备。