1.直接在根视图控制器上显示标签栏和导航栏
只有一个根视图控制器,在AppDelegate.m文件中的- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)lanuchOptions方法中添加如下代码:
- //创建导航栏对象
- UINavigationController *pNavigation = [[UINavigationController alloc]initWithRootViewController:self.viewController];
- //创建另外一个类的对象
- LinAnotherViewController * pAnotherVC = [[LinAnotherViewController alloc]initWithNibName:nil bundle:nil];
- //创建Tabbar对象
- UITabBarController *pTabBar = [[UITabBarController alloc]init];
- //初始化数组,存储标签栏的内容
- NSArray *pArray = [NSArray arrayWithObjects:pNavigation,pAnotherVC, nil nil];
- //把数组中内容传递给标签栏控制器
- pTabBar.viewControllers = pArray;
- //设置根视图控制器
- self.window.rootViewController = pTabBar;
此时视图都为空,可按照之前学习的方法添加相应的控件、图片、设置导航栏、标签栏的属性等。
2.新建根视图控制器,显示切换界面后的标签栏和导航栏
当需要在页面跳转后显示标签栏和导航栏,此时应该设置新的根视图,在它上面编写创建相应的视图控制器、导航栏,再添加到标签栏控制器中。需要实现AppDelegate的委托创建新的根视图。
首先是导入新视图的名称,特别是:LinAppDelegate.h文件。
- #import "LinFirstViewController.h"
- #import "LinSecondViewController.h"
- #import "LinThirdViewController.h"
- //委托协议代理
- #import "LinAppDelegate.h"
重写- (void)viewDidLoad方法:
- - (void)viewDidLoad
- {
- [super viewDidLoad];
- //创建视图对象和相应的导航栏对象,假设均有导航栏
- LinFirstViewController * pFirstVC = [[LinFirstViewController alloc]initWithNibName:nil bundle:nil];
- UINavigationController * pFirstNavigation = [[UINavigationController alloc]initWithRootViewController:pFirstVC];
- LinSecondViewController * pSecondVC = [[LinSecondViewController alloc]initWithNibName:nil bundle:nil];
- UINavigationController * pSecondNavigation = [[UINavigationController alloc]initWithRootViewController:pSecondVC];
- LinThirdViewController * pThirdVC = [[LinThirdViewController alloc]initWithNibName:nil bundle:nil];
- UINavigationController * pThirdNavigation = [[UINavigationController alloc]initWithRootViewController:pThirdVC];
- //初始化数组,存储导航控制器
- NSArray * array = [[NSArray alloc]initWithObjects:pFirstNavigation, pSecondNavigation, pThirdNavigation, nil nil];
- //初始化标签栏控制器
- UITabBarController * pTabBar = [[UITabBarController alloc]init];
- //设置标签栏中视图控制器(数组)
- pTabBar.viewControllers = array;
- //根据委托协议调用方法
- [self goInNemView:pTabBar];
- }
- //构造委托协议的方法,把标签控制器放在新的根视图中
- - (void)goInNemView:(id)sender
- {
- //获取当前程序
- UIApplication * app = [UIApplication sharedApplication];
- //创建应用程序的委托对象
- LinAppDelegate * pDelegate = app.delegate;
- //设置新的根视图控制器,用委托的方法实现代理
- pDelegate.window.rootViewController = sender;
- }
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