“锁定屏幕”时ios应用程序崩溃

Question

I have a problem with tab bar application. Everything working good, but if i send in simulator command "lock screen" debugger console says that application crashed. What can it be?

debugger message:

GNU gdb 6.3.50-20050815 (Apple version gdb-1518) (Sat Feb 12 02:52:12 UTC 2011)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
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There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin".Attaching to process 407.
2011-03-16 23:35:59.084 Smokie[407:207] -[OverviewController applicationWillResignActive:]: unrecognized selector sent to instance 0x4e20650
2011-03-16 23:35:59.088 Smokie[407:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[OverviewController applicationWillResignActive:]: unrecognized selector sent to instance 0x4e20650'
*** Call stack at first throw:
(
•   0   CoreFoundation                      0x00dcb5a9 __exceptionPreprocess + 185
•   1   libobjc.A.dylib                     0x00f1f313 objc_exception_throw + 44
•   2   CoreFoundation                      0x00dcd0bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
•   3   CoreFoundation                      0x00d3c966 ___forwarding___ + 966
•   4   CoreFoundation                      0x00d3c522 _CF_forwarding_prep_0 + 50
•   5   Foundation                          0x00025669 _nsnote_callback + 145
•   6   CoreFoundation                      0x00da39f9 __CFXNotificationPost_old + 745
•   7   CoreFoundation                      0x00d2293a _CFXNotificationPostNotification + 186
•   8   Foundation                          0x0001b20e -[NSNotificationCenter postNotificationName:object:userInfo:] + 134
•   9   UIKit                               0x002bc0a8 -[UIApplication _setActivated:] + 334
•   10  UIKit                               0x002bf905 -[UIApplication _handleApplicationSuspend:eventInfo:] + 292
•   11  UIKit                               0x002c9039 -[UIApplication handleEvent:withNewEvent:] + 4127
•   12  UIKit                               0x002c0abf -[UIApplication sendEvent:] + 71
•   13  UIKit                               0x002c5f2e _UIApplicationHandleEvent + 7576
•   14  GraphicsServices                    0x01723992 PurpleEventCallback + 1550
•   15  CoreFoundation                      0x00dac944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
•   16  CoreFoundation                      0x00d0ccf7 __CFRunLoopDoSource1 + 215
•   17  CoreFoundation                      0x00d09f83 __CFRunLoopRun + 979
•   18  CoreFoundation                      0x00d09840 CFRunLoopRunSpecific + 208
•   19  CoreFoundation                      0x00d09761 CFRunLoopRunInMode + 97
•   20  GraphicsServices                    0x017221c4 GSEventRunModal + 217
•   21  GraphicsServices                    0x01722289 GSEventRun + 115
•   22  UIKit                               0x002c9c93 UIApplicationMain + 1160
•   23  Smokie                              0x00001c30 main + 102
•   24  Smokie                              0x00001bc1 start + 53
)
terminate called after throwing an instance of 'NSException'
sharedlibrary apply-load-rules all
Current language:  auto; currently objective-c
(gdb) 

Answer 1

For some reason, unclear from the question, an instance of OverviewController is in place where an UIApplicationDelegate should be. May be a mixup with outlets in the MainWindow xib? In the Main Windo xib, the "delegate" outlet in the UIApplication instance should be assigned to the UIApplicationDelegate. Is that the case?

I say this because the error is caused by the method applicationWillResignActive: being called on the OverviewController and not found. applicationWillResignActive: is the method the application calls in the application delegate before locking.