ios开发 UITabBarController

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：

#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：

-(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;  }  

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