UITabBarController的程序创建和配置 - 为选项卡设置系统映像

Question

以编程方式在app中创建tabBar非常简单:

self.tabBarController = [[UITabBarController alloc] init]; 
[self.view addSubview:_tabBarController.view];

UIViewController * tab1 = [[UIViewController alloc] init];
tab1.title = "A";

UIViewController * tab2 = [[UIViewController alloc] init];
tab2.title = "B";

_tabBarController.viewControllers = [NSArray arrayWithObjects:patientSearch,todoList,nil];

[tab1 release];
[tab2 release];

您还可以轻松地将图像放入选项卡中:

tab1.tabBarItem.image = [UIImage imageNamed:@"myIcon.png"];

但是,如何将这些选项卡的图像设置为系统图像？(例如,搜索,收藏,书签等)在IB中,这是通过更改"标识符"来设置的,但是如何以编程方式执行此操作

Answer 1

 UITabBarItem *aTabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:0];

UITabBarItem docs

UITabBarSystemItem可以在选项卡栏上使用的系统项.

typedef enum {
   UITabBarSystemItemMore,
   UITabBarSystemItemFavorites,
   UITabBarSystemItemFeatured,
   UITabBarSystemItemTopRated,
   UITabBarSystemItemRecents,
   UITabBarSystemItemContacts,
   UITabBarSystemItemHistory,
   UITabBarSystemItemBookmarks,
   UITabBarSystemItemSearch,
   UITabBarSystemItemDownloads,
   UITabBarSystemItemMostRecent,
   UITabBarSystemItemMostViewed,
} UITabBarSystemItem;

设置它 patientSearch.tabBarItem = aTabBarItem;