將視圖推入導航堆棧后釋放給我exc_bad_access錯誤

Question

如果釋放未注釋，則tableView didSelectRowAtIndexPath中的以下代碼會出現錯誤：

ComicDetailsViewController * comicDetailsViewController = [[ComicDetailsViewController alloc] initWithNibName:@"ComicDetailsViewController" bundle:nil];
       comicDetailsViewController.comic = (Comic *)[arrayOfComics objectAtIndex:indexPath.row];
       comicDetailsViewController.bLoadPerformances = YES;
       [self.navigationController pushViewController:comicDetailsViewController animated:YES];
       //[comicDetailsViewController release];

該錯誤不會立即發生，而是在我單擊omicDetailsViewController中的后退按鈕后立即發生。

即）我選擇tableview行，下一個視圖加載並正常工作。 一旦完成該視圖並單擊后退導航按鈕，程序就會崩潰，並給我exc_bad_access。 為什么是這樣？

編輯：

#0  0x9682b176 in __kill
#1  0x9682b168 in kill$UNIX2003
#2  0x968bd89d in raise
#3  0x968d39bc in abort
#4  0x968c2164 in szone_error
#5  0x968c21e7 in free_small_botch
#6  0x000a7877 in -[NSConcreteMutableData dealloc]
#7  0x00006433 in -[ComicDetailsViewController dealloc] at ComicDetailsViewController.m:376
#8  0x003cbcc7 in -[UINavigationController setDisappearingViewController:]
#9  0x003c9219 in -[UINavigationController _clearLastOperation]
#10 0x003c9b62 in -[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:]
#11 0x0055224a in -[UINavigationTransitionView _notifyDelegateTransitionDidStopWithContext:]
#12 0x0055338a in -[UINavigationTransitionView _navigationTransitionDidStop]
#13 0x0034829d in -[UIViewAnimationState sendDelegateAnimationDidStop:finished:]
#14 0x0034812f in -[UIViewAnimationState animationDidStop:finished:]
#15 0x0244ca28 in run_animation_callbacks
#16 0x0244c8e9 in CA::timer_callback
#17 0x02688d43 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__
#18 0x0268a384 in __CFRunLoopDoTimer
#19 0x025e6d09 in __CFRunLoopRun
#20 0x025e6280 in CFRunLoopRunSpecific
#21 0x025e61a1 in CFRunLoopRunInMode
#22 0x02f0c2c8 in GSEventRunModal
#23 0x02f0c38d in GSEventRun
#24 0x00326b58 in UIApplicationMain
#25 0x000020f4 in main at main.m:14

編輯2：

這是comicDetailsViewController的dealloc塊：

- (void)dealloc {
[comic release];
[xmlParser release];
[webData release];
[currentPerformanceObject release];
[arrayOfPerformances release];
[soapResults release];
[btnPerformances release];
[super dealloc];

}

第376行是webData發布行

編輯3：

    -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    NSLog(@"ERROR with theConenction");
    [connection release];
    [webData release];
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSLog(@"DONE. Received Bytes: %d", [webData length]);

    if(xmlParser)
    {
        [xmlParser release];
    }

    xmlParser = [[NSXMLParser alloc] initWithData: webData];
    [xmlParser setDelegate: self];
    [xmlParser setShouldResolveExternalEntities: YES];
    [xmlParser parse];

    [connection release];
    [webData release];
}

Answer 1

請向我們顯示堆棧跟蹤。

但是我最初的猜測是您在ComicDetailsViewController類的- (void) dealloc ComicDetailsViewController 。

請檢查幾件事

• 您的dealloc塊還好
• 您不會從其他地方釋放comicDetailsViewController對象或comicDetailsViewController對象的引用。

希望這可以幫助。

謝謝，Madhup

Answer 2

在彈出視圖之前，通過向適當的對象發送取消消息來取消NSURLConnection。

假設您的NSURLConnection對象名為asyncConnection：

-(void)viewWillDisappear:(BOOL)animated
   [asyncConnection cancel];
}

Answer 3

問題仍然可能在您的dealloc中。

僅僅因為該對象位於您的@interface（.h文件）中，並不意味着您可以/必須取消分配該變量。 我也有這個問題

.h文件

@interface PeopleViewController : UITableViewController {
NSArray *people;
}

@property (nonatomic, retain) NSArray *people;

@end

.m文件

@implementation PeopleViewController

@synthesize people;

- (void)viewDidLoad {
    people = [town.people allObjects];
}

...

- (void)dealloc {
    [people release];
}

@end

我不需要釋放人員，因為在定制視圖中時，我沒有增加對象的保留計數，因此在dealloc過程中釋放它會引起我的問​​題。