如何在ios中从一个视图导航到另一个视图？

Question

我有带有 4 个选项的标签栏。
在第一个选项卡中，我有一个按钮。当我单击此按钮时，我必须在第二个标签栏中从一个视图移动到另一个视图。

我目前使用的代码是（shipVC 是第二个标签的viewController）：

[shipVC.navigationController pushViewController:cartVC animated:NO];

所以基本上，当按下第一个标签viewController 中的按钮时，我想从第二个标签viewController 中的“X”视图移动到“Y”视图

Answer 1

一种快速的方法是使用NSNotificationCenter 在第一个选项卡的viewController 中的按钮被按下时发布通知。

步骤：

1. 在第二个选项卡的viewController 的-viewDidLoad 方法中：
   • 添加通知观察者并为其设置目标选择器方法
2. 在第一个标签的viewController的按钮方法中：
   • 发布通知

示例：

您的第二个标签的viewController 类：

-(void)viewDidLoad {
    [super viewDidLoad];

    [NSNotificationCenter defaultCenter] addObserver:self
                                            selector:@selector(doTheNavigation)
                                                name:@"AnyNameYouWantForNotification"
                                              object:nil];
}

-(void)doTheNavigation {
    [self.navigationController pushViewController:cartVC animated:NO];
    //WARNING: don't just push, put a check  or else repeated click on the
    //button in the 1st tab will push cartVC again and again.
    //This will not only warrant a crash but look very ugly
}

---

第一个标签的viewController 类中的按钮方法：

-(IBAction)someBtnClick:(UIButton *)sender {
    //...
    //you can use this to post a notification from anywhere now
    [[NSNotificationCenter defaultCenter] postNotificationName:@"AnyNameYouWantForNotification" 
                                                        object:nil];
    //...
}

---

所以...

• 单击第一个选项卡中的按钮时，按钮操作（我命名为 someBtnClick）将发布一个名为 AnyNameYouWantForNotification 的通知
• 第二个选项卡（应该已经加载并准备好了）将监听名称为 AnyNameYouWantForNotification 的通知。
  • 收到此通知后，它将执行链接选择器方法（我命名为doTheNavigation）

Answer 2

检查我的答案

-(void)settabbar{

        UIViewController *viewController1 = [[[viewController1 alloc] initWithNibName:@"viewController1" bundle:nil] autorelease];
        UIViewController *viewController2 = [[[viewController2 alloc] initWithNibName:@"viewController2" bundle:nil] autorelease];
        UIViewController *viewController3 = [[[viewController3 alloc] initWithNibName:@"viewController3" bundle:nil] autorelease];


        navControl1=[[UINavigationController alloc]initWithRootViewController:viewController1];
        navControl2=[[UINavigationController alloc]initWithRootViewController:viewController2];
        navControl3=[[UINavigationController alloc]initWithRootViewController:viewController3];

        navControl1.navigationBar.tintColor=[UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.8];
        navControl2.navigationBar.tintColor=[UIColor blackColor];
        navControl3.navigationBar.tintColor=[UIColor blackColor];

        self.tabBarController = [[[UITabBarController alloc] init] autorelease];
        self.tabBarController.delegate=self;
        self.tabBarController.viewControllers = [NSArray arrayWithObjects:navControl1,navControl2,navControl3, nil ];

        [[[[self.tabBarController tabBar] items] objectAtIndex:2] setFinishedSelectedImage:[UIImage imageNamed:@""] withFinishedUnselectedImage:[UIImage imageNamed:@""]];
        [[[[self.tabBarController tabBar] items] objectAtIndex:0] setTitle:@"view1"];
        [[[[self.tabBarController tabBar] items] objectAtIndex:0] setImage:[UIImage imageNamed:@"tab2.png"]];
        [[[[self.tabBarController tabBar] items] objectAtIndex:1] setTitle:@"view2"];
        [[[[self.tabBarController tabBar] items] objectAtIndex:1] setImage:[UIImage imageNamed:@"tab11.png"]];
        [[[[self.tabBarController tabBar] items] objectAtIndex:2] setTitle:@"ciew3"];
        [[[[self.tabBarController tabBar] items] objectAtIndex:2] setImage:[UIImage imageNamed:@"tab5.png"]];
        [[[[self.tabBarController tabBar] items] objectAtIndex:3] setTitle:@"Maintain Customer"];
        [[[[self.tabBarController tabBar] items] objectAtIndex:3] setImage:[UIImage imageNamed:@"tab4.png"]];

        [self.tabBarController.tabBar setSelectionIndicatorImage:[UIImage imageNamed:@"trans.png"]];

        UIImage* tabBarBackground = [UIImage imageNamed:@""];
        [[UITabBar appearance] setBackgroundImage:tabBarBackground];
        [[UITabBar appearance] setSelectionIndicatorImage:[UIImage imageNamed:@"trans.png"]];
    }

    -(BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController*)viewController{

        NSLog(@"select : %d",tabBarController.tabBar.selectedItem.tag);

        if(self.tabBarController.tabBar.selectedItem.tag==0){
            [[self.tabBarController.viewControllers objectAtIndex:0] popViewControllerAnimated:YES];
        }else if(self.tabBarController.tabBar.selectedItem.tag==1){
            [[self.tabBarController.viewControllers objectAtIndex:1] popViewControllerAnimated:YES];
        }else if(self.tabBarController.tabBar.selectedItem.tag==2){
            [[self.tabBarController.viewControllers objectAtIndex:2] popViewControllerAnimated:YES];
        }else {
            [(UINavigationController*) viewController popToRootViewControllerAnimated:YES];
        }

        return YES;

    }

Answer 3

您还需要在您的 appdelegate 中使用 Naigationcontroller 进行应用

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] ;


 HomeViewController *homeView = [[HomeViewController alloc]        initWithNibName:@"HomeViewController" bundle:[NSBundle mainBundle]];

[self.navigationController pushViewController:homeView animated:YES];
UINavigationController *navController=[[UINavigationController alloc]initWithRootViewController:homeView];

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

之后，您的导航栏将出现在您的第一个视图控制器中，然后您就可以导航了。