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我正在创建一个带有标签栏控制器的iPad应用程序,需要登录.所以在启动时,我想显示一个LoginViewController,如果登录成功,则显示标签栏控制器.这就是我实现初始测试版本的方法(遗漏了一些典型的标题内容等)......

AppDelegate.h:

@interface AppDelegate_Pad : NSObject 
        <UIApplicationDelegate, LoginViewControllerDelegate> {
    UIWindow *window;
    UITabBarController *tabBarController;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UITabBarController *tabBarController;
@end

AppDelegate.m:

@implementation AppDelegate_Pad
@synthesize window;
@synthesize tabBarController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    LoginViewController_Pad *lvc = [[LoginViewController_Pad alloc] initWithNibName:@"LoginViewController_Pad" bundle:nil];
    lvc.delegate = self;
    [window addSubview:lvc.view];
    //[lvc release];
    [window makeKeyAndVisible];
    return YES;
}
- (void)loginViewControllerDidFinish:(LoginViewController_Pad *)loginViewController {
    [window addSubview:tabBarController.view];
}
- (void)dealloc {...}
@end

LoginViewController_Pad.h:

@protocol LoginViewControllerDelegate;
@interface LoginViewController_Pad : UIViewController {
    id<LoginViewControllerDelegate> delegate; …