Question

我想知道如何从tabBarItem中显示popOver？以下是我管理tabBarController的方法：

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]];

我想添加第五个项目，它会显示一个popover ...任何想法？感谢

Answer 1

为了获得我的UITabBarItem框架，我注意到在iPad上（在iPhone上的项目是autorisizingWidth它更简单）项目宽度为75px，间隔为34px。

所以我这样做：

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

获得第一个灵活的sapce宽度。然后我补充说：

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

获取项目的宽度中心。

Answer 2

我建议不要这样做，因为这不是标签栏的预期行为。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];

Answer 3

您可以抓取标签栏的视图层次结构并查找UIControl子类（它们可能以随机顺序出现，因此您需要按最左侧的center.x对其进行排序）。每一个都是一个标签栏按钮，它有一个矩形。

这种方法似乎属于App Store安全编码的范畴，特别是如果操作系统升级破坏了您的代码，您可以回到仅使用标签栏的frame。

UIView有一个名为recursiveDescription的方便的无记录方法，它对调试非常有用。 E.g：

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

iPhone：从tabBarItem显示popOver

3 个答案: