iPhone:显示tabBarItem中的popOver

我想知道怎样才能从tabBarItem中显示popor？ 以下是我如何管理tabBarController：

tabBarController = [[UITabBarController alloc] init];

searchSplitViewController = [[UISplitViewController alloc] init];
searchRoot = [[[EI_iPad_Home_Root_ViewController alloc] init] autorelease];
searchDetail = [[[EI_iPad_Home_Detail_ViewController alloc] init] autorelease]; 
searchRootNav = [[[EI_Navigation_ViewController alloc] initWithRootViewController:searchRoot]autorelease];
searchDetailNav = [[[EI_Navigation_ViewController alloc] initWithRootViewController:searchDetail] autorelease];
searchSplitViewController.viewControllers = [NSArray arrayWithObjects:searchRootNav, searchDetailNav, nil];
searchSplitViewController.delegate = searchDetail;

favoritesSplitViewController = [[UISplitViewController alloc] init];
favoritesRoot = [[[EI_iPad_Favorites_Root_ViewController alloc] init] autorelease];
favoritesDetail = [[[EI_iPad_Favorites_GeneralDetail_ViewController alloc] init] autorelease]; 
favoritesRootNav = [[[EI_Navigation_ViewController alloc] initWithRootViewController:favoritesRoot]autorelease];
favoritesDetailNav = [[[EI_Navigation_ViewController alloc] initWithRootViewController:favoritesDetail] autorelease];
favoritesSplitViewController.viewControllers = [NSArray arrayWithObjects:favoritesRootNav, favoritesDetailNav, nil];
favoritesSplitViewController.delegate = favoritesDetail;

agencySplitViewController = [[UISplitViewController alloc] init];
agencyRoot = [[[EI_iPad_Agency_Root_ViewController alloc] init] autorelease];
agencyDetail = [[[EI_iPad_Agency_GeneralDetail_ViewController alloc] init] autorelease]; 
agencyRootNav = [[[EI_Navigation_ViewController alloc] initWithRootViewController:agencyRoot]autorelease];
agencyDetailNav = [[[EI_Navigation_ViewController alloc] initWithRootViewController:agencyDetail] autorelease];
agencySplitViewController.viewControllers = [NSArray arrayWithObjects:agencyRootNav, agencyDetailNav, nil];
agencySplitViewController.delegate = agencyDetail;

editoSplitViewController = [[UISplitViewController alloc] init];
editoRoot = [[[EI_iPad_News_Root_ViewController alloc] init] autorelease];
editoDetail = [[[EI_iPad_News_Detail_ViewController alloc] init] autorelease]; 
editoRootNav = [[[EI_Navigation_ViewController alloc] initWithRootViewController:editoRoot]autorelease];
editoDetailNav = [[[EI_Navigation_ViewController alloc] initWithRootViewController:editoDetail] autorelease];
editoSplitViewController.viewControllers = [NSArray arrayWithObjects:editoRootNav, editoDetailNav, nil];
editoSplitViewController.delegate = editoDetail;

searchSplitViewController.tabBarItem.title = NSLocalizedString(@"TabBar_search_label",nil);
searchSplitViewController.tabBarItem.image = [UIImage imageNamed:@"tabBar_search_icon.png"];

favoritesSplitViewController.tabBarItem.title = NSLocalizedString(@"TabBar_favorite_label",nil);
favoritesSplitViewController.tabBarItem.image = [UIImage imageNamed:@"tabBar_favorite_icon.png"];

agencySplitViewController.tabBarItem.title = NSLocalizedString(@"TabBar_agencies_label",nil);
agencySplitViewController.tabBarItem.image = [UIImage imageNamed:@"tabBar_agencies_icon.png"];

editoSplitViewController.tabBarItem.title = NSLocalizedString(@"TabBar_news_label",nil);
editoSplitViewController.tabBarItem.image = [UIImage imageNamed:@"tabBar_news_icon.png"];

tabBarController.viewControllers = [NSArray arrayWithObjects:searchSplitViewController,favoritesSplitViewController,agencySplitViewController,editoSplitViewController,nil];
[window addSubview:[tabBarController view]];

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我想添加第五项，它将显示一个弹出框。。。有什么想法吗？谢谢

我建议不要这样做，因为这不是选项卡栏的预期行为。但是，您可以创建UIPopoverController并使用presentPopoverFromRect显示它

UIPopoverController *pop = [[UIPopoverController alloc] initWithContentViewController:someVC];

[pop presentPopoverFromRect:CGRectMake(100,100,100,100) permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

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为了得到我的UITabBarItem框架，我注意到在iPad上（iPhone上的项目是自动识别的，它更简单），项目的宽度是75像素，间隔是34像素

因此，我：

(tabBar.frame.size.width-((75*[tabBarController.items count])+(34*[tabBarController.items count]-1)))/2

以获得第一个灵活的sapce宽度。 然后我补充说：

(75*indexOfItemToReach)+(34*(indexOfItemToReach-1))+(75/2)

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获取项目的宽度中心。

您可以对选项卡栏的视图层次结构进行爬网，并查找UIControl子类（它们可能以随机顺序出现，因此您需要按照最左边的

center.x

对它们进行排序）。每一个都是一个选项卡栏按钮，它将有一个rect

这种方法似乎属于App Store安全编码的范畴，特别是当操作系统升级破坏了您的代码时，如果您退回到只使用选项卡栏的

frame

UIView有一个名为

recursiveDescription

的简便的未记录方法，对于调试非常有用。例如：

(gdb) po [[[[[UIApplication sharedApplication] delegate] tabBarController] view] recursiveDescription]

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谢谢，这是我第一次做的，但是我够不到tabBarItem的框架。我不知道如何得到正确的答案。我发现这个解决方案对iPad很有用。