将包含3个项目的选项卡栏添加到基于视图的应用程序

Question

所以，现在我已经创建了一个基于视图的应用程序，有8个不同的视图。我想让它在3个视图上显示一个选项卡栏。该选项卡栏将具有3个项目，这将允许用户切换到所述3个视图。

我该怎么做呢？非常感谢。

AppDelegate.h

@interface LoginPageAppDelegate : NSObject <UIApplicationDelegate, UITabBarControllerDelegate> {
    UIWindow *window;
    LoginPageViewController *viewController;
    UITabBarController *tabBarController;

}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet LoginPageViewController *viewController;
@property (nonatomic, retain) IBOutlet IBOutlet UITabBarController *tabBarController;


@end

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    tabBarController = [[UITabBarController alloc] init];
    tabBarController.delegate=self;

    RequestPage* requestPage = [[RequestPage alloc] init];  
    UIViewController *RequestPageView = [[UIViewController alloc] initWithRootViewController:requestPage];  

    StatusPage* statusPage = [[StatusPage alloc] init];  
    UIViewController *StatusPageView = [[UIViewController alloc] initWithRootViewController:statusPage];  
    NSArray* controllers = [NSArray arrayWithObjects:RequestPageView, StatusPageView, nil]; 
    tabBarController.viewControllers = controllers;

    [window addSubview:tabBarController.view];        

    [self.window makeKeyAndVisible];

    return YES;
}

RequestPage.m

- (id)init {
    self.title = @"Request Page";
    UIImage* anImage = [UIImage imageNamed:@"3.png"];
    UITabBarItem* theItem = [[UITabBarItem alloc] initWithTitle:@"Request Page" image:anImage tag:2];
    self.tabBarItem = theItem;
    [theItem release];
    return self;
}

Answer 1

你需要从基于视图的应用程序开始。然后在appDelegate文件中创建一个UITabbarController。

Appdelegate.h

UITabBarController *tabBarController;
// set properties

Appdelegate.m

// Synthsize

tabBarController = [[UITabBarController alloc] init];
tabBarController.delegate=self;

//Adding Search,Nearby,Map,AboutUs,Favorites Tabs to tabBarController  
Search * search = [[Search alloc] init];  
UINavigationController *searchNav = [[UINavigationController alloc] initWithRootViewController:search];  

Nearby* nearby = [[Nearby alloc] init];  
UINavigationController *nearbyNav = [[UINavigationController alloc] initWithRootViewController:nearby];  

Map* map = [[Map alloc] init];  
UINavigationController *mapNav = [[UINavigationController alloc] initWithRootViewController:map];  

AboutUs* aboutUs = [[AboutUs alloc] init];  
UINavigationController *aboutUsNav = [[UINavigationController alloc] initWithRootViewController:aboutUs];  

Favorites* favorites = [[Favorites alloc] init];  
UINavigationController *favoritesNav = [[UINavigationController alloc] initWithRootViewController:favorites];  

NSArray* controllers = [NSArray arrayWithObjects:searchNav,nearbyNav,mapNav,aboutUsNav,favoritesNav, nil];  
tabBarController.viewControllers = controllers;  

[window addSubview:tabBarController.view];    

您可以相应地管理要在哪个选项卡中放置导航控制器或仅放置视图控制器。

然后，在上面提到的每个视图控制器中，您需要实现

- (id)init {}

您可以在其中设置选项卡名和图像。

更新：

- (id)init {
        self.title = @"Second";
        UIImage* anImage = [UIImage imageNamed:@"3.png"];
        UITabBarItem* theItem = [[UITabBarItem alloc] initWithTitle:@"Second" image:anImage tag:2];
        self.tabBarItem = theItem;
        [theItem release];
    return self;
}

Answer 2

最好是创建一个基于标签栏的应用程序以及UINavigationController来导航多个视图。