1.创建一个UITableController
2.为每个Tab创建一个视图控制器
3.创建一个array 把视图控制器都添加到array中 在把array放到UITabBarCtrl的Controllers中
4.设置根视图为tabBar
*只有在支持旋转的设置 才会旋转 发生旋转时只有当前的ViewController才会接受到旋转的消息
*对于UITabBar自带的tabBar 不能直接去修改
//修改背景图片
UIImage *tabBackground = [UIImage imageNamed:@"main_title2.png"];
if ([tabBarController.tabBar respondsToSelector:@selector(setBackgroundImage:)]){
[tabBarController.tabBar setBackgroundImage:tabBackground];
}
常用委托
//当点击tabBarItem时触发该操作
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *) viewController {
NSLog(@"%d", viewController.tabBarItem.tag);
}
通过代理我们可以监测UITabBarController的当前选中viewController的变化,以及moreViewController中对编辑所有viewController的编辑。通过实现下面方法:
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController;
该方法用于控制TabBarItem能不能选中,返回NO,将禁止用户点击某一个TabBarItem被选中。但是程序内部还是可以通过直接setSelectedIndex选中该TabBarItem。
下面这三个方法主要用于监测对moreViewController中对view controller的edit操作
- (void)tabBarController:(UITabBarController *)tabBarController willBeginCustomizingViewControllers:(NSArray *)viewControllers;
- (void)tabBarController:(UITabBarController *)tabBarController willEndCustomizingViewControllers:(NSArray *)viewControllers changed:(BOOL)changed;
- (void)tabBarController:(UITabBarController *)tabBarController didEndCustomizingViewControllers:(NSArray *)viewControllers changed:(BOOL)changed;
改变UITabBarController中当前显示的viewController
1、selectedIndex属性
通过该属性可以获得当前选中的viewController,设置该属性,可以显示viewControllers中对应的index的viewController。如果当前选中的是MoreViewController的话,该属性获取出来的值是NSNotFound,而且通过该属性也不能设置选中MoreViewController。设置index超出viewControllers的范围,将会被忽略。
2、selectedViewController属性
通过该属性可以获取到当前显示的viewController,通过设置该属性可以设置当前选中的viewController,同时更新selectedIndex。可以通过给该属性赋值
tabBarController.moreNavigationController可以选中moreViewController。
3、viewControllers属性
设置viewControllers属性也会影响当前选中的viewController,设置该属性时UITabBarController首先会清空所有旧的viewController,然后部署新的viewController,接着尝试重新选中上一次显示的viewController,如果该viewController已经不存在的话,会接着尝试选中index和selectedIndex相同的viewController,如果该index无效的话,则默认选中第一个viewController。
UITabBarItem
//小红圈提示
barItem1.badgeValue = @"1";
//给选中的状态和未选中的状态指定不同的图片
[item setFinishedSelectedImage:[UIImage imageNamed:@"second.png"]
withFinishedUnselectedImage:[UIImage imageNamed:@"first.png"]];
//每个UIController中都有一个navigationItem和一个tabBarItem 一般创建一个相应类型的对象 对其赋值
//系统样式
UITabBarItem * barItem1 = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemContacts tag:0];
barItem1.badgeValue = @"1";
yvCtrl.tabBarItem = barItem1;
//自定义样式
firstController.tabBarItem=[[UITabBarItem alloc] initWithTitle:@"First" image:[UIImage imageNamed:@"img.png"] tag:101]
//重写ViewController里的init 在初始化里添加Item
(id)init {
if ([super init] != nil) {
UITabBarItem *item = [[UITabBarItem alloc] initWithTitle:@"asdfsadf" image:[UIImage imageNamed:@"WWAN5.png"] tag:1];
self.tabBarItem = item;
[item release];
}
return self;
}
创建一个UITabConroller:
.h文件中:
[java] view plain copy print ?
- #import<UIKit/UIKit.h>
-
- @interface AppDelegate :UIResponder <UIApplicationDelegate,UITabBarControllerDelegate>
- {
- UITabBarController* tabBarController;
- }
-
- @property (strong,nonatomic)UIWindow *window;
- @property (nonatomic,retain) UITabBarController* tabBarController;
- -(void) initTabBarController;
-
- @end
.m文件中:
[java] view plain copy print ?
- -(void) initTabBarController
- {
- // create a tab bar controller
- self.tabBarController = [[UITabBarControlleralloc]init];
- self.tabBarController.delegate =self;
- //1====>navhomeController
- HomeController* homeView = [[HomeControlleralloc]initWithNibName :@"HomeController"bundle : nil];
- UINavigationController* navhomeController = [[UINavigationControlleralloc]initWithRootViewController : homeView];
- [homeView release];
- [navhomeController.navigationBarcustomed];
- [navhomeController.navigationBarcustomedBarBackground];
- navhomeController.navigationBar.topItem.title =@"文件查看";
- navhomeController.tabBarItem = [[UITabBarItemalloc]initWithTitle:@"文件查看" image:[UIImageimageNamed:@"home.png"] tag :0];
-
- TempViewController* temp1 = [[TempViewControlleralloc]initWithNibName:@"TempViewController"bundle:nil];
- UINavigationController* navTempController = [[UINavigationControlleralloc]initWithRootViewController : temp1];
- [temp1 release];
- navTempController.navigationBar.topItem.title =@"最近";
- navTempController.tabBarItem = [[UITabBarItemalloc]initWithTitle:@"最近"image:[UIImageimageNamed:@"icon_bookmark.png"] tag :1];
-
- DesktopViewController* desktopView = [[DesktopViewControlleralloc]initWithNibName:@"DesktopViewController"bundle:nil];
- UINavigationController* navDesktopView = [[UINavigationControlleralloc]initWithRootViewController : desktopView];
- [desktopView release];
- [navDesktopView.navigationBarcustomed];
- navDesktopView.navigationBar.topItem.title =@"桌面";
- navDesktopView.tabBarItem = [[UITabBarItemalloc]initWithTitle:@"桌面"image:[UIImageimageNamed:@"icon_attention.png"] tag :2];
-
- TempViewController* temp3 = [[TempViewControlleralloc]initWithNibName:@"TempViewController"bundle:nil];
- UINavigationController* navTempController3 = [[UINavigationControlleralloc]initWithRootViewController : temp3];
- [temp3 release];
- navTempController3.navigationBar.topItem.title =@"搜索";
- navTempController3.tabBarItem = [[UITabBarItemalloc]initWithTitle:@"搜索"image:[UIImageimageNamed:@"icon_search.png"] tag :3];
-
-
- //5====>SettingController
- SettingController* settingView = [[SettingControlleralloc]initWithNibName :@"SettingController"bundle : nil];
- UINavigationController* navSettingView = [[UINavigationControlleralloc]initWithRootViewController : settingView];
- [settingView release];
- navSettingView.navigationBar.topItem.title =@"设置";
- navSettingView.tabBarItem = [[UITabBarItemalloc]initWithTitle:@"设置"image:[UIImageimageNamed:@"icon_setting.png"] tag :4];
-
- tabBarController.viewControllers = [NSArrayarrayWithObjects : navhomeController,navTempController,navDesktopView,navTempController3,navSettingView,nil];
-
- OCRELEASE(navhomeController);
- OCRELEASE(navTempController);
- OCRELEASE(navDesktopView);
- OCRELEASE(navTempController3);
- OCRELEASE(navSettingView);
-
- // add navigation controllers to the tab bar controller
- // tabBarController.viewControllers = [NSArray arrayWithObjects : navhomeController,navPersonalController,navAttentionView,navSeekView,navSettingView,nil];
- // OCRELEASE(navhomeController);
- // OCRELEASE(navPersonalController);
- // OCRELEASE(navAttentionView);
- // OCRELEASE(navSeekView);
- // OCRELEASE(navSettingView);
- }
- @synthesize tabBarController;
-
- - (void)dealloc
- {
- [_windowrelease];
- [tabBarControllerrelease];
- [superdealloc];
- }
-
- - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
- {
- self.window = [[[UIWindowalloc]initWithFrame:[[UIScreenmainScreen]bounds]]autorelease];
- // Override point for customization after application launch.
- [selfinitTabBarController];
-
- self.window.rootViewController =tabBarController;
- [self.windowmakeKeyAndVisible];
- returnYES;
- }