TabViewController+ UINavigationController

原文链接：http://xiaoyu.li/2012/creat-navigationcontroller-and-tabbarcontroller-at-the-same-time/

同时创建navigationController和tabBarController

第一种方式是在AppDelegate中将tabBarController作为subView，然后再在tabBarController的基础上增加navigationController，代码如下：
在applicationDidFinishLauchingWithOptions中加入以下代码：

-(BOOL)application:(UIApplication *)applicationDidFinishLauchingWithOptions:(NSDictionary *)lauchingOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    self.window.backgroundColor = [UIColor whiteColor];    

    UITabBarController *tabBarController = [[[UITabBarController alloc] init]autorelease];

    FirstViewController *firstController = [[FirstViewController alloc] initWithNibName:nil bundle:nil];
    UINavigationController *firstNavigation = [[[UINavigationController alloc] initWithRootViewController:firstController]autorelease];
    [firstController release];

    SecondViewController *secondController = [[SecondViewController alloc] initWithNibName:nil bundle:nil];
    UINavigationController *secondNavigation = [[[UINavigationController alloc] initWithRootViewController:secondController]autorelease];
    [secondController release];

    tabBarController.viewControllers = [NSArray arrayWithObjects:firstNavigation,secondNavigation,nil];

    [window addSubview:tabBarController.view];
    [window makeKeyAndVisible];
}

这样之后分别在FirstViewController.m和SecondViewController.m里面加入如下代码：

-(id)init
{
    self = [super initWithNibName:nil bundle:nil];
    if(self)
    {
        UITabBarItem *tabBarItem = [self tabBarItem];
        [tabBarItem setTitle] = @"xxx";
        [tabBarItem setImage] = [UIImage imageNamed:@"xxxxx"];
    }
    return self;
}

-(id)initWithNibName:(NSString *)nibName bundle:(NSBundle *bundle)
{
    return [self init];
}

这样的话，就创建了既有navigationBar又有TabBar的应用了，而且这种方法是tabBar在每个界面都是存在的。

第二种方法，仅仅是在一个页面上显示tabBar，这种方法不像上一种，需要将两个tabBar的界面放在一个根视图（假设为InitialViewController），代码如下：
在applicationDidFinishLauchingWithOptions中加入以下代码：

-(BOOL)application:(UIApplication *)applicationDidFinishLauchingWithOptions:(NSDictionary *)lauchingOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    self.window.backgroundColor = [UIColor whiteColor];

    InitialViewController *initial = [[[InitialViewController alloc]init]autorelease];

    UINavigationController *navigationController = [[[UINavigationController alloc]initWithRootViewController:initial]autorelease];

    [self.window addSubview:navigationController.view];
    [self.window makeKeyAndVisible];
}

然后在InitialViewController.m中import需要加载到tabBar的ViewController，加上如下方法：

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    if (self = [super initWithNibName:nil bundle:nil])
    {
        FirstViewController *firstController = [[FirstViewController alloc]init];
        UIImage *image1 = [UIImage imageNamed:@"tabBar1.png"];
        firstController.tabBarItem = [[[UITabBarItem alloc] initWithTitle:@"xxxx" image:image1 tag:0]autorelease];

        SecondViewController *secondController = [[SecondViewController alloc] init];
        UIImage *image2 = [UIImage imageNamed:@"tabBar2.png"];
        secondController.tabBarItem = [[[UITabBarItem alloc] initWithTitle:@"xxxx" image:image2 tag:0]autorelease];

        // 组装TabBar
        self.viewControllers = [NSArray arrayWithObjects:firstController,secondController, nil];

        [firstController release];
        [secondController release];
    }

    return self;
}