我应该使用每个选项卡栏单独的UINavigationController [英] Should I use an individual UINavigationController per Tab Bar

问题描述

根据苹果，我可以将 UINavigationController 和 UITabBarController 使用代码，例如

  MyViewController1 * vc1 = [[MyViewController1 alloc] init]; 
 MyViewController2 * vc2 = [[MyViewController2 alloc] init]; 
 MyViewController3 * vc3 = [[MyViewController3 alloc] init]; 
 
 MyNavRootViewController * vc4 = [[MyNavRootViewController alloc] init]; 
 UINavigationController * navController = [[UINavigationController alloc] 
 initWithRootViewController：vc4]; 
 
 NSArray * controllers = [NSArray arrayWithObjects：vc1，vc2，vc3，navController，nil]; 
 tabBarController.viewControllers = controllers; 
 

在此设置中，只有 vc4 UINavigationController ，但是如果我想 vc1-vc3 也有 UINavigationController / p>

  MyViewController1 * vc1 = [[MyViewController1 alloc] init]; 
 UINavigationController * nv1 = [[UINavigationController alloc] 
 initWithRootViewController：vc1]; 
 
 MyViewController1 * vc2 = [[MyViewController2 alloc] init]; 
 UINavigationController * nv2 = [[UINavigationController alloc] 
 initWithRootViewController：vc2]; 
 
 MyViewController1 * vc3 = [[MyViewController3 alloc] init]; 
 UINavigationController * nv3 = [[UINavigationController alloc] 
 initWithRootViewController：vc3]; 
 
 
 NSArray * controllers = [NSArray arrayWithObjects：nv1，nv2，nv3，nil]; 
 tabBarController.viewControllers = controllers;这是正确的方法吗？
 

>解决方案

$

   - （BOOL）application：（UIApplication *）application didFinishLaunchingWithOptions：（NSDictionary *）launchOptions 
 {
 self.window = [[[UIWindow alloc] initWithFrame：[[UIScreen mainScreen] bounds]] autorelease]; 
 
 
 //应用程序启动后覆盖自定义点。 
 
 self.tabBarController = [[[UITabBarController alloc] init] autorelease]; 
 
 self.tabBarController.viewControllers = [self initializeTabBarItems]; 
 self.navigationController = [[UINavigationController alloc] init]; 
 [self.navigationController setNavigationBarHidden：YES]; 
 self.window.rootViewController = self.navigationController; 
 [self.navigationController pushViewController：_tabBarController animated：YES]; 
 [self.window makeKeyAndVisible]; 
 return YES; 
} 
  - （NSArray *）initializeTabBarItems 
 {
 NSArray * retval; 
 
 / *初始化视图控制器* / 
 UIViewController * viewController1 = [[[FirstViewController alloc] initWithNibName：@FirstViewControllerbundle：nil] autorelease]; 
 UIViewController * viewController2 = [[[SecondViewController alloc] initWithNibName：@SecondViewControllerbundle：nil] autorelease]; 
 UIViewController * viewController3 = [[[ThirdViewController alloc] initWithNibName：@ThirdViewControllerbundle：nil] autorelease]; 
 UIViewController * viewController4 = [[[FourthViewController alloc] initWithNibName：@FourthViewControllerbundle：nil] autorelease]; 
 UIViewController * viewController5 = [[[[FivfthViewController alloc] initWithNibName：@FivfthViewControllerbundle：nil] autorelease]; 
 
 
 / *初始化导航控制器* / 
 UINavigationController * navigationController1 = [[UINavigationController alloc] initWithRootViewController：viewController1]; 
 UINavigationController * navigationController2 = [[UINavigationController alloc] initWithRootViewController：viewController2]; 
 UINavigationController * navigationController3 = [[UINavigationController alloc] initWithRootViewController：viewController3]; 
 UINavigationController * navigationController4 = [[UINavigationController alloc] initWithRootViewController：viewController4]; 
 UINavigationController * navigationController5 = [[UINavigationController alloc] initWithRootViewController：viewController5]; 
 
 / *发布视图控制器* / 
 [viewController1 release]; 
 [viewController2 release]; 
 [viewController3 release]; 
 [viewController4 release]; 
 [viewController5 release]; 
 
 / * Stuff导航控制器返回值* / 
 retval = [NSArray arrayWithObjects：viewController1，viewController2，viewController3，viewController4，viewController5，nil]; 
 
 / *发布导航控制器* / 
 [navigationController1 release]; 
 [navigationController2 release]; 
 [navigationController3 release]; 
 [navigationController4 release]; 
 [navigationController5 release]; 
 
 return（retval）; 
} 
  

你可以试试这个....

According to Apple, I can combine UINavigationController and UITabBarController using the code, e.g.

MyViewController1* vc1 = [[MyViewController1 alloc] init];
MyViewController2* vc2 = [[MyViewController2 alloc] init];
MyViewController3* vc3 = [[MyViewController3 alloc] init];

MyNavRootViewController* vc4 = [[MyNavRootViewController alloc] init];
UINavigationController* navController = [[UINavigationController alloc]
                        initWithRootViewController:vc4];

NSArray* controllers = [NSArray arrayWithObjects:vc1, vc2, vc3, navController, nil];
tabBarController.viewControllers = controllers;

In this setup, only vc4 has the UINavigationController, but what if I want vc1-vc3 also has the UINavigationController?, should I do like..

MyViewController1* vc1 = [[MyViewController1 alloc] init];
UINavigationController* nv1 = [[UINavigationController alloc]
                        initWithRootViewController:vc1];

MyViewController1* vc2 = [[MyViewController2 alloc] init];
UINavigationController* nv2= [[UINavigationController alloc]
                        initWithRootViewController:vc2];

MyViewController1* vc3 = [[MyViewController3 alloc] init];
UINavigationController* nv3 = [[UINavigationController alloc]
                        initWithRootViewController:vc3];


NSArray* controllers = [NSArray arrayWithObjects:nv1, nv2, nv3, nil];
tabBarController.viewControllers = controllers;

Is this the right approach?

解决方案

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];


// Override point for customization after application launch.

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

 self.tabBarController.viewControllers = [self initializeTabBarItems];
self.navigationController = [[UINavigationController alloc]init];
[self.navigationController setNavigationBarHidden:YES];
self.window.rootViewController = self.navigationController;
[self.navigationController pushViewController:_tabBarController animated:YES];
[self.window makeKeyAndVisible];
return YES;
}
- (NSArray *)initializeTabBarItems
{
NSArray * retval;

/* Initialize view controllers */
UIViewController *viewController1 = [[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil] autorelease];
UIViewController *viewController2 = [[[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil] autorelease];
UIViewController *viewController3 = [[[ThirdViewController alloc]initWithNibName:@"ThirdViewController" bundle:nil]autorelease];
UIViewController *viewController4 = [[[FourthViewController alloc] initWithNibName:@"FourthViewController" bundle:nil] autorelease];
UIViewController *viewController5  = [[[FivfthViewController alloc] initWithNibName:@"FivfthViewController" bundle:nil] autorelease];


/* Initialize navigation controllers */
UINavigationController * navigationController1 = [[UINavigationController alloc] initWithRootViewController:viewController1];
UINavigationController * navigationController2 = [[UINavigationController alloc] initWithRootViewController:viewController2];
UINavigationController * navigationController3 = [[UINavigationController alloc] initWithRootViewController:viewController3];
UINavigationController * navigationController4 = [[UINavigationController alloc] initWithRootViewController:viewController4];
UINavigationController * navigationController5 = [[UINavigationController alloc] initWithRootViewController:viewController5];

/*  Release View Controllers */
[viewController1 release];
[viewController2 release];
[viewController3 release];
[viewController4 release];
[viewController5 release];

/* Stuff Navigation Controllers into return value */
retval = [NSArray arrayWithObjects:viewController1,viewController2,viewController3,viewController4,viewController5,nil];

/* Release Navigation Controllers */
[navigationController1 release];
[navigationController2 release];
[navigationController3 release];
[navigationController4 release];
[navigationController5 release];

return (retval);
}

You Can Try This ....

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