Objective c UISPlitViewController弹出按钮缺失

我试图以编程方式将当前视图替换为SplitViewController。这是我的密码

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];

---

除了一个例外，这几乎可以正常工作。加载“拆分视图”控制器并处于纵向模式时，导航视图将隐藏（如预期的那样），但局部视图没有带按钮的工具栏，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。我错过什么了吗？detailViewController中的内容很少，因此我没有在此处包含代码，但如果有帮助，请告诉我。

您的代码中缺少一些内容

首先，要使用导航栏添加按钮，必须在

UISplitViewController

和

ProjectDetailController

之间有一个

UINavigationController

其次，必须设置UISPlitViewController delegate，并使用委托方法添加按钮：

- (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，不要忘记为您刚刚实现的

ProjectNavigationController

设置标题，或者在

splitViewController:willHideViewController:withBarButtonItem:forPopoverController

方法中手动为

barButtonItem

设置标题。有人有什么想法吗？