iphone组合标签栏和navigationController

Question

我使用 apple 文档以编程方式实现组合标签栏和导航，

调用initWithFrame时不起作用，[黑屏]；但如果保留下面的代码，它可以用于显示主屏幕，没有选项卡栏，并且当使用选项卡栏时，

这里的代码

会变成黑屏

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:( NSDictionary *)launchOptions {                  
self.tabBarController = [[[UITabBarController alloc] init] autorelease];
StartViewController *startViewControllerView = [[[StartViewController alloc] init] autorelease]; //ojo 推荐苹果！
VideosViewController* VideosViewController_ = [[[VideosViewController alloc] init] autorelease];
PhotosViewController* PhotosViewController_ = [[[PhotosViewController alloc] init] autorelease];
SocialViewController* SocialViewController_ = [[[SocialViewController alloc] init] autorelease];
self.pagesNavigation = [[[UINavigationController alloc] initWithRootViewController:startViewControllerView] autorelease];
self.pagesNavigation.navigationBarHidden = NO;
NSArray* 控制器 = [NSArray arrayWithObjects:VideosViewController_, PhotosViewController_, SocialViewController_, startViewControllerView, nil];
self.tabBarController.viewControllers = 控制器；

[self.window addSubview:startViewControllerView.view];
//self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
[self.window makeKeyAndVisible];
  return YES;
}

所以如果如上所示，它可以工作，但是如果我注释 addSubview 并取消注释 initWithFrame，它就不起作用，

  //[self.window addSubview:startViewControllerView.view];
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

那么，我缺少什么？ 调用 initWithFrame 的正确方法是什么？

多谢！

Answer 1

为什么你所有的视图控制器都会自动释放？您可能应该保留它们并仅在使用完它们后才释放它们。

至于您的结构，我发现为 tabbarcontroller 中的每个选项卡构建单个导航控制器，将它们添加到控制器，然后将 tabbarcontroller 添加到窗口，就像这样......

AppDelegate.h

property (nonatomic, retain) UITabBarController *tabBarController;
property (nonatomic, retain) UINavigationController *firstNavController;
property (nonatomic, retain) UINavigationController *secondNavController;
property (nonatomic, retain) FirstViewController *firstViewController;
property (nonatomic, retain) SecondViewController *secondViewController;

AppDelegate.m

firstViewController = [[FirstViewController alloc] someInitMethod:someArg];
firstNavController = [[UINavigationController alloc] initWithRootViewController:firstViewController]; 

secondViewController = [[SecondViewController alloc] someInitMethod:someArg];
secondNavController = [[UINavigationController alloc] initWithRootViewController:secondViewController]; 

tabBarController = [[UITabbarController alloc] init];

NSArray *tabs = [NSArray arrayWithObjects:firstNavController, secondNavController, nil];

[tabBarController setViewControllers:tabs animated:NO];

self.window.rootViewController = tabBarController;
[self.window makeKeyAndVisible];