UISPlitViewController彈出按鈕丟失

Question

我想以編程方式用SplitViewController替換當前視圖。這是我的代碼。

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]; 

這幾乎工作正常，只有一個例外。當加載拆分視圖控制器並處於縱向模式時，導航視圖隱藏 - 如預期的那樣 - 但詳細視圖沒有工具欄，其中有一個按鈕用於在彈出視圖中顯示導航。從我的研究中，我明白這是默認行爲。我錯過了什麼嗎？ detailViewController中的內容很少，所以我沒有在這裏包含代碼，但是如果它有幫助，請告訴我。

Answer 1

代碼中缺少一些內容;

首先，要讓導航欄添加按鈕，您必須在UISplitViewController和ProjectDetailController之間有UINavigationController。

其次，你必須設置一個UISplitViewControllerDelegate和使用委託方法來添加按鈕：

- (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，不要忘記將標題設置爲您ProjectNavigationController，或者手動設置一個標題您剛剛實施的splitViewController:willHideViewController:withBarButtonItem:forPopoverController方法中的barButtonItem。