我应该为每个标签栏使用一个单独的 UINavigationController答案

【问题标题】：Should I use an individual UINavigationController per Tab Bar我应该为每个标签栏使用一个单独的 UINavigationController
【发布时间】：2012-08-30 02:23:58
【问题描述】：

根据Apple，我可以使用代码组合UINavigationController和UITabBarController，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;

在这个设置中，只有 vc4 有 UINavigationController，但是如果我想要 vc1-vc3 也有 UINavigationController 怎么办？，我应该喜欢。 .

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？

【问题讨论】：

嗯，这取决于您是否想要...你的目标是什么？
如果您必须在单个选项卡中浏览多个视图，那么您将需要使用 navigationController。如果每个选项卡要显示单个 ViewController，则不要使用 navigationController。这完全取决于您的要求。

标签： iphone objective-c ios xcode cocoa

【解决方案1】：

- (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);
}

你可以试试这个......

【讨论】：

不应该是：retval = [NSArray arrayWithObjects: navigationController1, navigationController2, navigationController3, navigationController4, navigationController5,nil];

【解决方案2】：

是的，霍华德，你的方法很好。 Apple 也这么说。在使用 UITabbarController 和 UINavigationController 时，我也遵循相同的方法，这对我来说非常有用。

【讨论】：

【解决方案3】：

您的 TabBarController 的每个选项卡都应该有一个 UINavigationController。所以你的第二种方法是正确的。我不认为您可以为所有选项卡重用相同的导航控制器。

【讨论】：

【解决方案4】：

是的，您的方法是正确的。

如果你必须将视图导航到选项卡中，那么该选项卡应该有导航控制器。

UINavigationController * navigationCtrl = [[UINavigationController alloc] initWithRootViewController:firstTabViewCtrl];
[arrTabs addObject:navigationCtrl];

无论哪种方式，标签内都不需要导航控制器。

 [arrTabs addObject:firstTabViewCtrl];

【讨论】：