在我们的项目中，当点击警报视图的按钮时，应用程序崩溃并显示以下崩溃日志。
示例代码：
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"Room has been checked out. Please contact Front desk." delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
[alertView show];
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
[[NSNotificationCenter defaultCenter] postNotificationName:@"TestNotification" object:nil];
}
崩溃日志：
Date/Time: 2013-10-10 17:51:11.390 +0530
OS Version: iOS 6.1.3 (10B329)
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x62694c37
Crashed Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libobjc.A.dylib 0x3b8455b0 objc_msgSend + 16
1 UIKit 0x357abe7c -[UIWindow firstResponder] + 64
2 UIKit 0x3581966c -[UIWindow _makeKeyWindowIgnoringOldKeyWindow:] + 300
3 UIKit 0x357be2b0 -[UIResponder resignFirstResponder] + 384
4 UIKit 0x358ff71a -[UIAlertView(Private) resignFirstResponder] + 38
5 UIKit 0x358ff292 -[UIAlertView(Private) _performPopoutAnimationAnimated:coveredBySpringBoardAlert:] + 434
6 UIKit 0x358920c0 -[UIApplication sendAction:to:from:forEvent:] + 68
7 UIKit 0x35892072 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 26
8 UIKit 0x35892050 -[UIControl sendAction:to:forEvent:] + 40
9 UIKit 0x35891906 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 498
10 UIKit 0x35891dfc -[UIControl touchesEnded:withEvent:] + 484
11 UIKit 0x357ba5ec -[UIWindow _sendTouchesForEvent:] + 520
12 UIKit 0x357a77fc -[UIApplication sendEvent:] + 376
13 UIKit 0x357a7116 _UIApplicationHandleEvent + 6150
....
xcode 控制台中的异常：
2013-10-10 18:34:05.910 MyProject[1423:907] -[OS_dispatch_queue _windowBecameKey]: unrecognized selector sent to instance 0x1dd8ac10