将视图推向导航堆栈后的释放给我exc_bad_access错误

Question

以下代码在tableView didSelectRowatIndExpath中，如果发行版未注册，我会收到错误：

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];

该错误不会立即发生，一旦我单击OmicDetailsViewController中的“返回”按钮，就会发生这种错误。

即。）我选择tableview行，下一个视图加载并正常工作。完成该视图后，单击“返回导航”按钮，程序崩溃并给我exc_bad_access。为什么是这样？

编辑：

#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

编辑2：

这是ComicDetailsViewController DealLoc块：

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

}

第376行是WebData发行线

编辑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

请向我们展示堆栈跟踪。

但是我最初的猜测是你在做错了什么 - (void) dealloc 你的 ComicDetailsViewController 班级。

请检查几件事

• 您的 dealloc 块没关系
• 你没有释放 comicDetailsViewController 对象或从其他地方引用它。

希望这可以帮助。

谢谢，玛杜普

Answer 2

在弹出视图之前，请通过向适当的对象发送取消消息来取消您的nsurlconnection。

假设您的nsurlconnection对象被命名为asyncconnection：

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

Answer 3

问题仍然可能在您的DealLoc中。

仅仅因为对象在您的@interface（.h文件）中，这并不意味着您可以/必须处理变量。我也有这个问题

.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

我不需要释放人员，因为在我的自定义视图中，我没有增加对物体的保留，因此在DealLoc过程中释放它会导致我的问题。