ios - UIWebView crashes when app resumes from background -


i've noticed constant reproducible crash occurs in uiwebview: here stack trace:

incident identifier: 4729da31-a946-436d-97ac-eb3c8746e0ff crashreporter key:   92eabebd7d2b07f27dde132a3c28d6bb7cf92df4 hardware model:      ipad3,6 process:         ... [3120] path:            /var/mobile/applications/10173a06-48d0-48f7-a832-9ac6961b045d/...app/... identifier:      ... version:         ??? (???) code type:       arm (native) parent process:  launchd [1]  date/time:       2013-05-09 19:07:31.997 +0100 os version:      ios 6.1.3 (10b329) report version:  104  exception type:  exc_bad_access (sigsegv) exception codes: kern_invalid_address @ 0x00000008 crashed thread:  2  ...  thread 2 name:  webthread     thread 2 crashed:     0   webcore                         0x3772a03a webcore::threadtimers::sharedtimerfiredinternal() + 130     1   webcore                         0x37729f86 webcore::timerfired(__cfrunlooptimer*, void*) + 62     2   corefoundation                  0x31741854 __cfrunloop_is_calling_out_to_a_timer_callback_function__ + 12     3   corefoundation                  0x317414fe __cfrunloopdotimer + 270     4   corefoundation                  0x31740172 __cfrunlooprun + 1226     5   corefoundation                  0x316b3238 cfrunlooprunspecific + 352     6   corefoundation                  0x316b30c4 cfrunloopruninmode + 100     7   webcore                         0x37697390 runwebthread(void*) + 440     8   libsystem_c.dylib               0x39a530de _pthread_start + 306     9   libsystem_c.dylib               0x39a52fa4 thread_start + 4

occurs following steps:

  1. make uiwebview load request (nsurlrequest)
  2. send app background before request loaded
  3. wait few minutes
  4. resuming app background crash exemplified stack trace information.

does know why happening? appreciated!

edit: code used perform request

- (void)viewdidload {     [super viewdidload];     nsurlrequest *urlrequest = [nsurlrequest requestwithurl:[nsurl urlwithstring:url]];     [self.webview loadrequest:urlrequest]; }

my uiviewcontroller delegate of uiwebview , implement following methods:

-(void)webview:(uiwebview *)webview didfailloadwitherror:(nserror *)error -(void)webviewdidfinishload:(uiwebview *)webview

the app crashed before of methods invoked.

for resolving 1 can add notification , when app going background process @ time pass nil value web view.

[[nsnotificationcenter defaultcenter] addobserver: self                                          selector: @selector(handleenteredbackground:)                                               name: uiapplicationdidenterbackgroundnotification                                            object: nil];

or place below code in applicationdidenterbackground method freezes tasks untill comes foreground process.

uiapplication *app = application;       [app beginbackgroundtaskwithexpirationhandler:^{         // synchronize cleanup call on main thread in case         // task finishes @ around same time.         dispatch_async(dispatch_get_main_queue(), ^{              //            if (bgtask != uibackgroundtaskinvalid)             //            {             //               // [app endbackgroundtask:bgtask];             //               // bgtask = uibackgroundtaskinvalid;             //            }         });     }];      // start long-running task , return immediately.     dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^{          // work associated task.           // synchronize cleanup call on main thread in case         // expiration handler fired @ same time.         dispatch_async(dispatch_get_main_queue(), ^{          });     });

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