两种常见的UITabBarController+UINavigationController模式分析比较

绝大部分软件都采用了UITabBarController+UINavigationController的设计模式,这是一种很主流很经典的设计方式,而另一种UINavigationController+UITabBarController也是一种很是灵活的模式

方式一:TabBarController的viewControllers + 一个NavigationController

建立过程大概以下(关键代码):

AppDelegate.m TabBarController *tabVC = [[TabBarController alloc]init]; //全局就这一个导航控制器 UINavigationController *nav =[[UINavigationController alloc] initWithRootViewController:tabVC]; self.window.rootViewController = nav; TabBarController.m - (void)viewDidLoad { [super viewDidLoad]; [self addChildVc:[[ChatViewController alloc] init] title:@"Chat" image:@"tabbar_home" selectedImage:@"tabbar_home_selected"]; [self addChildVc:[[ContactsListViewController alloc] init] title:@"Contact" image:@"tabbar_contacts" selectedImage:@"tabbar_contacts_selected"]; [self addChildVc:[[MoreViewController alloc] init] title:@"More" image:@"tabbar_more" selectedImage:@"tabbar_more_selected"]; [self addChildVc:[[ProfileViewController alloc] init] title:@"Profile" image:@"tabbar_profile" selectedImage:@"tabbar_profile_selected"]; } - (void)addChildVc:(UIViewController *)childVc title:(NSString *)title image:(NSString *)image selectedImage:(NSString *)selectedImage { childVc.title = title; childVc.tabBarItem.image = [UIImage imageNamed:image]; childVc.tabBarItem.selectedImage = [[UIImage imageNamed:selectedImage] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]; [self addChildViewController:childVc]; }

方式二:TabBarController的viewControllers + 多个NavigationController

建立过程大概以下(关键代码):

AppDelegate.m TabBarController *tabVC = [[TabBarController alloc]init]; self.window.rootViewController = tabVC; TabBarController.m - (void)viewDidLoad { [super viewDidLoad]; [self addChildVc:[[ChatViewController alloc] init] title:@"Chat" image:@"tabbar_home" selectedImage:@"tabbar_home_selected"]; [self addChildVc:[[ContactsListViewController alloc] init] title:@"Contact" image:@"tabbar_contacts" selectedImage:@"tabbar_contacts_selected"]; [self addChildVc:[[MoreViewController alloc] init] title:@"More" image:@"tabbar_more" selectedImage:@"tabbar_more_selected"]; [self addChildVc:[[ProfileViewController alloc] init] title:@"Profile" image:@"tabbar_profile" selectedImage:@"tabbar_profile_selected"]; } - (void)addChildVc:(UIViewController *)childVc title:(NSString *)title image:(NSString *)image selectedImage:(NSString *)selectedImage { childVc.title = title; childVc.tabBarItem.image = [UIImage imageNamed:image]; childVc.tabBarItem.selectedImage = [[UIImage imageNamed:selectedImage] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]; // 每个控制器都是导航控制器 UINavigationViewController *navigationVc = [[UINavigationViewController alloc] initWithRootViewController:childVc]; [self addChildViewController:navigationVc]; }

对比分析

第一种方式:

导航控制器上的title不能和tabbar上面的同步,须要手动单独设置,好比能够在控制器的viewWillAppear:方法里面设置.

navigationItem的左右按钮和颜色可能各不相相同,也须要在viewWillAppear:里切换设置.可能后续的界面跳转也须要在此方法里面设置.

第二种方式:

tabbar上的标题默认会直接同步到导航控制器上.

每一个界面都有本身的导航控制器, 界面跳转都有本身的栈, 可能会更加灵活.