iPhone开场动画及初始化带有导航(UINavigationController)的标签栏控制器(UITabBarController)

    很多程序需要开场动画,但仅仅用Default.png又满足不了自己的需求,如时间太短.解决其最好的办法就是加一个ViewController,我这起名为OpeningViewController.

   在AppDelegate.h里面声明:

    OpeningViewController *openingViewController;
...
    @property (nonatomic, retain) OpeningViewController *openingViewController;

    在AppDelegate.m中如下:

- (void)applicationDidFinishLaunching:(UIApplication *)application {   
	if(openingViewController == nil)
		openingViewController = [[OpeningViewController alloc] initWithNibName:@"OpeningViewController" bundle:nil];
	
	[window addSubview:openingViewController.view];
	
	[window makeKeyAndVisible];
	NSAutoreleasePool *pool=[[NSAutoreleasePool alloc] init];
	[self performSelectorInBackground:@selector(removeOpeningView) withObject:nil];
	[pool release];
	return YES;
}

-(void) removeOpeningView
{
	NSAutoreleasePool *pool=[[NSAutoreleasePool alloc] init];
	[NSThread sleepForTimeInterval:3];
	//[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackTranslucent animated:YES];
	[self setupUI];	
	[[UIApplication sharedApplication] setStatusBarHidden:NO animated:YES];
	[pool release];	
}

   在-(void) setupUI;中设置界面的UI.我这里是初始化一个带有导航(UINavigationController)的标签栏控制器(UITabBarController),如下:

-(void) setupUI {
	UIColor *titleBarColor=[UIColor colorWithRed:0.0/255.0 green:173.0/255.0 blue:238.0/255.0 alpha:1.0];
	
	//TabBar Item 1
	mainDirectoryViewController = [[MainDirectoryViewController alloc] initWithNibName:@"MainDirectoryViewController" bundle:nil];
	if (mainDirNavController == nil)
		mainDirNavController = [[UINavigationController alloc] initWithRootViewController:mainDirectoryViewController];
	mainDirNavController.navigationBar.tintColor = titleBarColor;

	//TabBar Item 2
	bookmarkViewController = [[BookmarkViewController alloc] initWithNibName:@"BookmarkViewController" bundle:nil];
	if (bookmarkNavController == nil)
		bookmarkNavController = [[UINavigationController alloc] initWithRootViewController:bookmarkViewController];
	bookmarkNavController.navigationBar.tintColor = titleBarColor;
	
	//TabBar Item 3
	aboutViewController = [[AboutViewController alloc] initWithNibName:@"AboutViewController" bundle:nil];
	if (aboutNavController == nil)
		aboutNavController = [[UINavigationController alloc] initWithRootViewController:aboutViewController];
	aboutNavController.navigationBar.tintColor = titleBarColor;

	UITabBarItem *customItem1 = [[UITabBarItem alloc] initWithTitle:@"学习" image:[UIImage imageNamed:@"some.png"] tag:0];
	UITabBarItem *customItem2 = [[UITabBarItem alloc] initWithTitle:@"书签" image:[UIImage imageNamed:@"some.png"] tag:1];
	UITabBarItem *customItem3 = [[UITabBarItem alloc] initWithTitle:@"关于" image:[UIImage imageNamed:@"some.png"] tag:2];
	
	mainTabBar = [[UITabBarController alloc] init];
	mainTabBar.delegate = self;
	mainTabBar.viewControllers = [NSArray arrayWithObjects:mainDirNavController, bookmarkNavController, aboutNavController, nil];
	mainDirNavController.tabBarItem = customItem1;
	bookmarkNavController.tabBarItem = customItem2;
	aboutNavController.tabBarItem = customItem3;
	[customItem1 release];
	[customItem2 release];
	[customItem3 release];
	
	[window addSubview:mainTabBar.view];

}