PopoverController - 释放的实例

Question

当我单击 splitviewcontroller 中的弹出按钮时，我收到消息：消息发送到已释放实例 0x6a66ca0

我已经发现这个实例必须是我分配和初始化的detailviewcontroller。到现在为止还挺好。但是当整个事情都不起作用时，我没有看到问题。

首先是我创建 Splitview 的 AppDelegate：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

    // TestViews for SplitViewController 
    // TestView1 *test1 = [[TestView1 alloc] initWithNibName:@"TestView1" bundle:nil];

    // TableView as RootViewController for the Left Hand Pane
    RootViewTableViewController *rootViewTableViewController = [[RootViewTableViewController alloc] initWithNibName:@"RootViewTableView" bundle:nil];
    UINavigationController *rootNavigationController = [[UINavigationController alloc] initWithRootViewController:rootViewTableViewController];

    DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:nil];
    UINavigationController *detailNavigationController = [[UINavigationController alloc] initWithRootViewController:detailViewController];

    self.splitViewController = [[UISplitViewController alloc] init];
    self.splitViewController.delegate = detailViewController;
    self.splitViewController.viewControllers = [NSArray arrayWithObjects:rootNavigationController,detailNavigationController, nil];
    self.window.rootViewController = self.splitViewController;

    [self.window makeKeyAndVisible];
    return YES;
}

首先我在想代码行 self.splitviewcontroller.delegate = detailviewcontroller;可能是问题......但整个应用程序完美启动。只有当我单击按钮时才会出现此问题。

RootViewController 是这样的（为了清楚起见，我省略了标准的 tableview 委托方法）

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {

        // Set Title of the TableView for the RootViewController
        self.title = @"Notarzteinsatzprotokoll";
        self.clearsSelectionOnViewWillAppear = NO;
        self.contentSizeForViewInPopover = CGSizeMake(320.0, 600.0);
    }
    NSLog(@"INIT %p", self);
    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.tableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] animated:NO scrollPosition:UITableViewScrollPositionMiddle];
}

和细节视图控制器：

#pragma mark -
#pragma mark Managing the Detail Item

- (void)setDetailItem:(id)newDetailItem
{
    if (_detailItem != newDetailItem) {
        _detailItem = newDetailItem;

        // Update the view
        [self configureView];
    }

    if (self.rootPopoverController != nil) {
        [self.rootPopoverController dismissPopoverAnimated:YES];
    }
}

- (void)configureView
{
    // Update the user interface for the detail item

    if (self.detailItem) {
        self.detailDescriptionLabel.text = [self.detailItem description];
    }
}


- (void)viewDidLoad {
    [super viewDidLoad];
    [self setTitle:@"Notarzteinsatzprotokoll"];
    [self configureView];
}

#pragma mark -
#pragma mark Rotation Support

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {
    return YES;
}


#pragma mark -
#pragma mark SplitView

- (void)splitViewController:(UISplitViewController *)svc willHideViewController:(UIViewController *)aViewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController:(UIPopoverController *)pc {
    barButtonItem.title = @"Master";
    [self.navigationItem setLeftBarButtonItem:barButtonItem animated:YES];
    self.rootPopoverController = pc;
}

- (void)splitViewController:(UISplitViewController *)svc willShowViewController:(UIViewController *)aViewController invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem {
    [self.navigationItem setLeftBarButtonItem:nil animated:YES];
    self.rootPopoverController = nil;
}

我看不到detailviewcontroller对象被释放的程序流程和其他东西试图发送消息的点......我是否必须交换一些代码行？

谢谢！ 塞巴斯蒂安

@end

Answer 1

该错误应该告诉您正在向已释放实例发送什么消息。不确定到底是什么问题，是 setTitle: 消息被发送到左栏按钮项吗？

在 splitViewController:willShowViewController: 中，您将左栏按钮项设置为 nil（这将释放它），而在 splitViewController:willHideViewController: 中，您尝试更改其标题，这可能是您的问题。