ios - iPad SplitViewController 以编程方式显示 Popover

Question

我有一个 iPad SplitViewController 应用程序，我在其中隐藏了纵向和横向模式的左 Pane 。当应用程序收到某个通知时，我需要在其弹出窗口中显示左 Pane 。尽管尝试了许多不同的建议解决方案，但我仍在努力寻找实现这一目标的方法。

我正在使用包含以下代码的 MultipleMasterDetailManager 实现:

/* forward the message to the current detail view
 * all detail views must implement UISplitViewControllerDelegate
 */
-(void)splitViewController:(UISplitViewController *)svc willHideViewController:(UIViewController *)aViewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController:(UIPopoverController *)pc
{
    self.masterBarButtonItem = barButtonItem;
    self.masterPopoverController = pc;

    barButtonItem.title = NSLocalizedString(@"Show Sidebar", @"Show Sidebar");

    [self.currentDetailController.navigationItem setLeftBarButtonItem:self.masterBarButtonItem animated:YES];
}

/* forward the message to the current detail view
 * all detail views must implement UISplitViewControllerDelegate
 */
-(void)splitViewController:(UISplitViewController *)svc willShowViewController:(UIViewController *)aViewController invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem
{
    //if (![self.currentDetailController isKindOfClass:[SyncSourceDetailViewController class]])
    //{
        self.masterBarButtonItem = nil;
        self.masterPopoverController = nil;

        [self.currentDetailController.navigationItem setLeftBarButtonItem:nil animated:YES];    
    //}    
}

详细 View Controller 本身也存在类似的方法。

收到通知时调用的方法如下:

- (void)navigateToLatest 
{   
        [self navigateToDocumentsTab];  
        [[self dataLoader] navigateToLatest];  // populates data for the left table view 
        UISplitViewController *splitViewController = (UISplitViewController *)self.window.rootViewController;
        UIView *view = [[[[[splitViewController viewControllers] objectAtIndex:1] viewControllers] objectAtIndex:0] view];  

        [self.masterDetailManager.masterPopoverController presentPopoverFromRect:CGRectMake(0, 0, 100, 100) inView:view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}

这是行不通的。我也尝试过使用 presentPopoverFromBarButtonItem 方法，但我似乎无法在代码中找到 leftBarButtonItem。

也许我的做法完全错误。

Answer 1

我最终通过在 navigateToLatest 方法中将我的应用程序委托(delegate)中的“showSidebar”变量设置为 true 来解决这个问题。然后在我的 DetailViewController 的 ViewDidAppear 事件中我检查这个变量的值，如果它是真的那么我使用下面的代码显示侧边栏:

UIPopoverController *masterPopoverController= [[theAppDelegate masterDetailManager] masterPopoverController];
        [masterPopoverController presentPopoverFromBarButtonItem:[self.navigationItem leftBarButtonItem] permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
        [theAppDelegate setShowSidebar:NO];