奇怪的崩潰從didFinishLaunchingWithOptions

在我的應用程序訪問核心數據，當我嘗試就在使用下面的代碼的應用程序didFinishLaunchingWithOptions結束訪問核心數據。這通常是整個應用程序（我在其他地方使用相同的代碼多次）沒有問題，但在這一點上崩潰，你可以看到如下：奇怪的崩潰從didFinishLaunchingWithOptions

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    UIView *splashScreen = [self splashScreen]; 

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
    [self.window addSubview:splashScreen]; 

    // Override point for customization after application launch. 
    self.window.backgroundColor = [UIColor whiteColor]; 
    [self.window setRootViewController:[[UIViewController alloc]init]]; 
    [self.window makeKeyAndVisible]; 

    [self configureRestKit]; 

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{ 

     ... do stuff ... 

     dispatch_async(dispatch_get_main_queue(), ^{ 

     ... more stuff (remove splash screen etc.) ... 

HERE I CALL THE CODE! ---> [self uploadPossibleDrives]; 

     } 



     }); 

    }); 

    return YES; 
}

這是我從didFinishLaunchingWithOptions（uploadPossibleDrives）調用的代碼：

NSManagedObjectContext *managedObjectContext = [kDelegate managedObjectContext]; 
if (!managedObjectContext) return; 

NSFetchRequest *request = [[NSFetchRequest alloc] init]; 
NSEntityDescription *entity = [NSEntityDescription entityForName:@"History" inManagedObjectContext:managedObjectContext]; 
[request setEntity:entity]; 

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"driveID" ascending:YES]; 
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil]; 
[request setSortDescriptors:sortDescriptors]; 
NSError *error; 
NSMutableArray *mutableFetchResults = [[managedObjectContext executeFetchRequest:request error:&error] mutableCopy]; 
if (mutableFetchResults == nil) 
{ 
    [kDelegate showAlert:kErrorTitle withMessage:kNoContextMessage andButton:kDismissButton]; 
} 
else 
{ 
    while (history = [enumerator nextObject]) { 
    if (![controller containsObject:history.car]) 
      { 

       NSMutableDictionary *driveDataByCar = [[NSMutableDictionary alloc] init]; 
       [driveDataByCar setObject:history.car forKey:@"car"]; 
CRASH! -----> [driveDataByCar setObject:history.energy forKey:@"energy"]; 
       [driveDataByCar setObject:history.energy_onlyDrive forKey:@"energy_only_drive"]; 
       [driveDataByCar setObject:history.cw forKey:@"cw"]; 
       [driveDataByCar setObject:history.weight forKey:@"weight"]; 
       [driveDataByCar setObject:history.area forKey:@"area"]; 
       [driveDataByCar setObject:history.maxPower forKey:@"maxPower"]; 
       [carDataToUpload addObject:driveDataByCar]; 

       [controller addObject:history.car]; 
       } 

      } 

      ... 

}

這裏是崩潰報告：

Fatal Exception: NSInvalidArgumentException 
*** setObjectForKey: object cannot be nil (key: energy) 
0 CoreFoundation __exceptionPreprocess + 130 
2 CoreFoundation -[__NSDictionaryM setObject:forKey:] + 818 
3 App UploadDriveData.m line 140 -[UploadDriveData uploadDrivingData] 
4 App AppDelegate.m line 302 __32-[AppDelegate uploadDrivingData]_block_invoke250 
5 libdispatch.dylib _dispatch_call_block_and_release + 10 
11 libsystem_pthread.dylib start_wqthread + 8 

Crashed: Thread 
SIGABRT ABORT at 0x3ba541f0 
0 libsystem_kernel.dylib __pthread_kill + 8 
9 CoreFoundation -[__NSDictionaryM setObject:forKey:] + 818 
10 App UploadDriveData.m line 140 -[UploadDriveData uploadDrivingData] 
11 App AppDelegate.m line 302 __32-[AppDelegate uploadDrivingData]_block_invoke250 
12 libdispatch.dylib _dispatch_call_block_and_release + 10 
17 libsystem_pthread.dylib _pthread_wqthread + 298`

我真的不知道爲什麼應用程序獲得了「能量」一比零。任何人有一個想法，爲什麼發生這種情況在didFinishLaunchingWithOptions和無處可在應用程序？感謝您抽出時間！

來源

2014-04-15 freshking

調試附加代碼日誌和斷點情況下'history.energy == nil'從這一點試着去了解這是如何發生 – sage444

如何屬性'energy'聲明？ – Amar

作爲一個NSNumber。 – freshking

那麼事實證明，在我的應用程序的另一點可變數組有時得到釋放預含有的能量和energy_onlyDrive的值。所以那些實際上被設置爲零。謝謝大家的幫助！

來源

2014-04-17 06:49:18 freshking

奇怪的崩潰從didFinishLaunchingWithOptions

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