UISPlitViewController弹出按钮丢失

Question

我想以编程方式用SplitViewController替换当前视图。这是我的代码。

ProjectNavigationController *projectNavPanel = [[ProjectNavigationController alloc] init]; 
[projectNavPanel setProjectIndex:[indexPath row]]; 
[projectNavPanel setKuluId:[[[[[appDelegate userSettingsDictionary] objectForKey:@"Projects"] objectAtIndex:[indexPath row]] objectForKey:@"Kulu Id"] intValue]]; 

ProjectDetailController *projectDetailPanel = [[ProjectDetailController alloc] init]; 
[projectDetailPanel setProjectIndex:[indexPath row]]; 
ProjectSplitViewController *splitRootController = [[ProjectSplitViewController alloc] init]; 

[splitRootController setViewControllers:[NSArray arrayWithObjects:projectNavPanel, projectDetailPanel, nil]]; 

[[self view] removeFromSuperview]; 
[[appDelegate window] setRootViewController:splitRootController]; 

这几乎工作正常，只有一个例外。当加载拆分视图控制器并处于纵向模式时，导航视图隐藏 - 如预期的那样 - 但详细视图没有工具栏，其中有一个按钮用于在弹出视图中显示导航。从我的研究中，我明白这是默认行为。我错过了什么吗？ detailViewController中的内容很少，所以我没有在这里包含代码，但是如果它有帮助，请告诉我。

Answer 1

代码中缺少一些内容;

首先，要让导航栏添加按钮，您必须在UISplitViewController和ProjectDetailController之间有UINavigationController。

其次，你必须设置一个UISplitViewControllerDelegate和使用委托方法来添加按钮：

- (void)splitViewController:(UISplitViewController *)svc willHideViewController:(UIViewController *)aViewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController:(UIPopoverController *)pc 
{ 
    [[projectDetailPanel navigationItem] setLeftBarButtonItem:barButtonItem animated:YES]; 
} 

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

第三，不要忘记将标题设置为您ProjectNavigationController，或者手动设置一个标题您刚刚实施的splitViewController:willHideViewController:withBarButtonItem:forPopoverController方法中的barButtonItem。