cocoa touch - NSManagedObjectContextDidSaveNotification not triggered in iOS 7 -


i have situation make changes properties of nsmanagedobject in main thread. belongs main managedobjectcontext of app.

my app has threading enabled downloads data, each thread has it's own managedobjectcontext created recent state of single persistentstore throughout application.

i implementing nsmanagedobjectcontextdidsavenotification changes in moc merged main thread's moc too. below code it:

- (void)backgroundmocdidsave:(nsnotification*)notification {     // probable fix for: http://stackoverflow.com/questions/3446983/collection-was-mutated-while-being-enumerated-on-executefetchrequest     if (![nsthread ismainthread])     {         [self performselectoronmainthread:@selector(backgroundmocdidsave:) withobject:notification waituntildone:yes];         return;     }      // merge background moc changes in main moc     [self.managedobjectcontext mergechangesfromcontextdidsavenotification:notification]; }

registering notification:

        [[nsnotificationcenter defaultcenter] addobserver:self                                                  selector:@selector(backgroundmocdidsave:)                                                      name:nsmanagedobjectcontextdidsavenotification                                                    object:nil];

strange things happen in ios 7 though. accessing nsmanagedobject created main moc:

  • when modify property of managedobject belongs main moc (main thread) , perform -save -backgroundmocdidsave: call not triggered
  • when not modify property of managedobject , perform -save operation on moc notification triggered

the same code working in ios 6. irrespective of whether changes done on managedobject or not, when -save call triggered on it's moc notification nsmanagedobjectcontextdidsavenotification gets triggered.

anyone faced problem before?

for i've noticed 1 thing that's wrong, i'm not sure it's causing error. nsmanagedobjectcontextdidsavenotification sent on thread on moc calls save running. merging should made on thread moc merging changes running on. in case works fine if changes merged background main moc, not other way around.


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