ios @try @catch block EXC_BAD_ACCESS從@catch返回

這個@ try- @ catch塊在我的viewDidLoad中崩潰時返回EXC_BAD_ACCESS;在抓執行，並警告不顯示或者：ios @try @catch block EXC_BAD_ACCESS從@catch返回

@try 
    {   
     errorText = @"thumbnails_array"; 

     unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data]; 
     // Customize unarchiver here 
     self.thumbnails_array = [unarchiver decodeObjectForKey:@"thumbnails_array"]; 
     [unarchiver finishDecoding]; 
     [unarchiver release]; 


     errorText = @"ThumbNailViewController"; 

     archivePath = [app.phojoArchiveDir stringByAppendingPathComponent:@"ThumbNailViewController.archive"]; 
     data = [NSData dataWithContentsOfFile:archivePath]; 
     unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data]; 
     // Customize unarchiver here 
     [unarchiver decodeObjectForKey:@"self"]; 
     [unarchiver finishDecoding]; 
     [unarchiver release]; 

     errorText = @"assetsGroupURL"; 

     archivePath = [app.phojoArchiveDir stringByAppendingPathComponent:@"assetsGroupURL.archive"]; 
     data = [NSData dataWithContentsOfFile:archivePath]; 
     unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data]; 
     // Customize unarchiver here 
     app.assetsGroupURL = [unarchiver decodeObjectForKey:@"assetsGroupURL"]; 
     [unarchiver finishDecoding]; 
     [unarchiver release]; 


    } 
    @catch (NSException *exception) 
    { 
     UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Phojo is unable to restore the previous editing session." delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil]; 
     [alert show]; 
     [alert release]; 

     NSLog(@"Exception %@ thrown while unarchving %@: Reason: %@ Items in userInfo = %d Stack Trace: %@", [exception name], errorText, [exception reason], [[exception userInfo] count], [NSThread callStackSymbols]); 
     [self.thumbnails_array release]; 
     self.thumbnails_array = nil; 
     [app.assetsGroupURL release]; 
     app.assetsGroupURL = nil; 

     return; 


    }

此代碼是在viewDidLoad中運行檢索了該應用的先前運行期間已歸檔數據。我在這段代碼中得到了一個異常，說明一個檔案是不可理解的。但隨着它崩潰，無法讓應用程序運行，因爲它在啓動時崩潰以及捕獲。有任何想法嗎？

來源

2012-02-10 user953175

請注意，Cocoa中的異常不是您可以從中恢復的錯誤。實際上，Apple表示，ARC的內存管理有意地打破了例外：http://blog.random-ideas.net/?p=98。嘗試避免讓代碼拋出異常比試圖從它們中恢復可能更好。 – 2012-02-10 17:47:28

您的assetsGroupURL或thumbnails_array屬性（或兩者）被聲明爲retain。這很好，但這意味着當您同時撥打[self.theProperty release]和self.theProperty = nil時，您會發布theProperty兩次：第二個電話使用的是retain-生成的設置程序，並隱式地將release設置爲當前值。刪除release調用，你不應該再看到EXC_BAD_ACCESS。

來源

2012-02-10 17:31:23

你是對的！感謝您捕捉...但是...仍然與EXC_BAD_ACCESS崩潰...我真的很感激你指出這個雙發佈，因爲它最終會成爲一個問題。 – user953175 2012-02-10 17:54:15

ios @try @catch block EXC_BAD_ACCESS從@catch返回

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