小编fra*_*ger的帖子

我一直在来自managedObjectContext上的save:命令崩溃.它甚至不满足NSLog语句,所以我没有看到未解决的错误语句,所以我无法弄清楚问题可能是什么.它不是每次都会发生,而只是偶尔发生.

这是代码(基本上想要增加一个计数器):

 if ([[managedObject valueForKey:@"canSee"]boolValue]){
    int read = [[managedObject valueForKey:@"timesRead"] intValue] +1;
    [managedObject setValue:[NSNumber numberWithInt:read] forKey:@"timesRead"]; 


    NSError *error;
    if (![resultsController.managedObjectContext save:&error]) {  //<-- crashes on this line!
        NSLog(@"Unresolved Core Data Save error %@, %@", error, [error userInfo]);
        exit(-1);
    }

在控制台窗口中,我收到如下消息:

  2010-08-20 08:12:20.594 AppName[23501:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFSet controllerWillChangeContent:]: unrecognized selector sent to instance 0xe54f560'

或这个:

  2010-08-20 08:12:20.594 AppName[23501:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFSet controllerWillChangeContent:]: unrecognized selector sent to instance …