iphone - super dealloc EXC_BAD_ACCESS 错误

Question

在分析我们的项目时，Xcode 在自定义 UIBarButtonItem 中附带了一个 posibe 泄漏通知。我修复了泄漏，但是在第二次加载 View 时，[super dealloc] 给出了 EXC_BAD_ACCESS 错误。

从 UIBarButtonItem 中删除自动释放(因此返回警告):

self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:toolbar] autorelease];

重新加载屏幕时没有问题。

自定义 UIBarButtonItem 和 dealloc 代码:

- (void)viewDidLoad
{
    [super viewDidLoad];

    // create a toolbar to have the buttons at the right side of the navigationBar
    UIToolbar* toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 150, 44.01)];
    toolbar.tintColor = [UIColor clearColor];
    [toolbar setTranslucent:YES];

    // create the array to hold the buttons, which then gets added to the toolbar
    NSMutableArray* buttons = [[NSMutableArray alloc] initWithCapacity:4];


    // Create a comments button
    propertiesButton = [[UIBarButtonItem alloc]
                        initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:@selector(properties)];
    [buttons addObject:propertiesButton];
    [propertiesButton release];

    // Create a comments button
    commentaryButton = [[UIBarButtonItem alloc]
                        initWithBarButtonSystemItem:UIBarButtonSystemItemCompose target:self action:@selector(comments)];
    [buttons addObject:commentaryButton];
    [commentaryButton release];

    // create a versions button
    versionsButton = [[UIBarButtonItem alloc]
                      initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:self action:@selector(versions)];
    [buttons addObject:versionsButton];
    [versionsButton release];

    // create a save button
    downloadButton = [[UIBarButtonItem alloc]
                      initWithBarButtonSystemItem:UIBarButtonSystemItemOrganize target:nil action:@selector(download)];
    [buttons addObject:downloadButton];
    [downloadButton release];

    // stick the buttons in the toolbar
    [toolbar setItems:buttons animated:NO];

    [buttons release];

    // and put the toolbar in the nav bar
    self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:toolbar] autorelease];
    [toolbar release];
}

- (void)dealloc
{
    [popOverController release];
    [propertiesButton release];
    [downloadButton release];
    [versionsButton release];
    [commentaryButton release];
    [webView release];
    [super dealloc];
}

有了 NSZombieEnabled，我得到了

'2011-08-01 10:30:36.571 ProjectName[100:707] *** -[UIBarButtonItem release]: message sent to deallocated instance 0x1fb330'

我们不确定如何解决这个问题。

提前谢谢你。

Answer 1

您将两次释放 propertiesButton、downloadButton、versionsButton、commentaryButton。第一次在 viewDidLoad 中，再次在 dealloc 中。

您不必在 dealloc 中释放它们，因为您已经在 viewDidLoad 中释放了它们。