如何使用 Objective C 在 iPhone 中添加 UITabBar

Question

如何以编程方式为 iPhone 应用程序添加 UITabBar。需要一些建议和示例代码。

Answer 1

这里有两个方面......

第一个方面（UITabBarController）：
在这里，您可以将多个类（即 Viewcontrollers）添加到 UITabBarController，如前面的答案所示...

第二个方面（UITabbar）：
在这里，您可以在任何视图控制器中添加选项卡栏...对于此选项卡栏，您可以添加多个 UITabBar 项目...并且您可以获得单独的选项卡栏项目操作...

请参阅下面的 UITabBar 代码

---------> 添加UITabBar

UITabBar *myTabBar = [[UITabBar alloc] initWithFrame:CGRectMake(0, 0, 320, 50)];
myTabBar.delegate=self;   //here you need import the protocol <UITabBarDelegate>
[self.view addSubview:myTabBar];

---------> 向 UITabBar 添加项目

NSMutableArray *tabBarItems = [[NSMutableArray alloc] init];

UITabBarItem *tabBarItem1 = [[UITabBarItem alloc] initWithTitle:@"Item1" image:[UIImage imageNamed:@"Item1image.png"] tag:0];
UITabBarItem *tabBarItem2 = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemContacts tag:1 ];
UITabBarItem *tabBarItem3 = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemHistory tag:2 ];

[tabBarItems addObject:tabBarItem1];
[tabBarItems addObject:tabBarItem2];
[tabBarItems addObject:tabBarItem3];

myTabBar.items = tabBarItems;
myTabBar.selectedItem = [tabBarItems objectAtIndex:0];

---------> 在委托方法中获取项目操作

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item {
    NSInteger selectedTag = tabBar.selectedItem.tag;
    NSLog(@"%ld",(long)selectedTag);
    if (selectedTag == 0) {
        //Do what ever you want here
    } else if(selectedTag == 1) {
        //Do what ever you want
    } else { //if(selectedTag == 2)
        //Do what ever you want here
    }
}

---

更新：(Swift 2.0)

1. 第一个方面（UITabBarController）：
这将允许我们将 UIViewController 配置为 UITabBarController 中的 tabbar 项。
下面是UITabBarController的基本方法：

--------->将 UITabBarController 添加到 appdelegate 中的窗口

let tabBarController = UITabBarController(nibName: nil, bundle: nil)
tabBarController.delegate = self // Need to import 'UITabBarControllerDelegate'
self.window!.rootViewController = tabBarController;
self.window?.makeKeyAndVisible();

--------->配置UIViewControllers

let firstViewController = UIViewController()
firstViewController.title = "FirstVC"
firstViewController.tabBarItem = UITabBarItem(tabBarSystemItem: UITabBarSystemItem.Bookmarks, tag: 0)
let firstNavController: UINavigationController = UINavigationController(rootViewController: firstViewController)

let secondViewController = UIViewController()
secondViewController.title = "SecondVC"
secondViewController.tabBarItem = UITabBarItem(tabBarSystemItem: UITabBarSystemItem.Contacts, tag: 1)
let secondNavController: UINavigationController = UINavigationController(rootViewController: secondViewController)

let thirdViewController = UIViewController()
thirdViewController.title = "ThirdVC"
thirdViewController.tabBarItem = UITabBarItem(tabBarSystemItem: UITabBarSystemItem.Downloads, tag: 2)
let thirdNavController: UINavigationController = UINavigationController(rootViewController: thirdViewController)

let forthViewController = UIViewController()
forthViewController.title = "ForthVC"
forthViewController.tabBarItem = UITabBarItem(tabBarSystemItem: UITabBarSystemItem.Favorites, tag: 3)
let forthNavController: UINavigationController = UINavigationController(rootViewController: forthViewController)

--------->将 UIViewController 附加到 UITabBarController

tabBarController.viewControllers = [firstNavController, secondNavController, thirdNavController, forthNavController]

--------->在“UITabBarControllerDelegate”中接收事件

func tabBarController(tabBarController: UITabBarController, didSelectViewController viewController: UIViewController) {
    print("didSelectViewController: \(viewController.title) ?")
}

2.第二个方面（UITabBar）：
这将允许我们创建 tabbar 项目。我们可以在委托方法中获取单个项目的事件
以下是UITabBar的基本方法：

--------->将 UITabBar 添加到视图

let frame = CGRectMake(0, CGRectGetHeight(self.view.frame) - 49, CGRectGetWidth(self.view.frame), 49)
let tabBar: UITabBar = UITabBar(frame: frame)
tabBar.delegate = self // Need to import 'UITabBarDelegate'
self.view.addSubview(tabBar)

--------->准备 TabbarItems

let tabBarItem1 = UITabBarItem(tabBarSystemItem: UITabBarSystemItem.Bookmarks, tag: 0)
let tabBarItem2 = UITabBarItem(tabBarSystemItem: UITabBarSystemItem.Contacts, tag: 1)
let tabBarItem3 = UITabBarItem(tabBarSystemItem: UITabBarSystemItem.Downloads, tag: 2)
let tabBarItem4 = UITabBarItem(tabBarSystemItem: UITabBarSystemItem.Favorites, tag: 3)

--------->将UITabBarItems添加到UITabBar

tabBar.items = [tabBarItem1, tabBarItem2, tabBarItem3, tabBarItem4]
tabBar.selectedItem = tabBarItem1

--------->在“UITabBarDelegate”中接收事件

func tabBar(tabBar: UITabBar, didSelectItem item: UITabBarItem) {
    let selectedTag:Int = (tabBar.selectedItem?.tag)!
    print(selectedTag)
    switch selectedTag {
    case 0:
        print("tabBarItem1")
        //Do what ever you want here
    case 1:
        print("tabBarItem2")
        //Do what ever you want here
    case 2:
        print("tabBarItem3")
        //Do what ever you want here
    default:
        print("tabBarItem4")
        //Do what ever you want here
    }
}

Answer 2

- (void) setUpTabBar {
    FirstViewController *firstViewController = [[FirstViewController alloc]init];
    firstViewController.title = @"First View";
    firstViewController.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemSearch tag:0];
    UINavigationController *firstNavController = [[UINavigationController alloc]initWithRootViewController:firstViewController];

    SecondViewController *secondViewController = [[SecondViewController alloc]init];
    secondViewController.title = @"Second View";
    secondViewController.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:1];
    UINavigationController *secondNavController = [[UINavigationController alloc]initWithRootViewController:secondViewController];

    ThirdViewController *thirdViewController = [[ThirdViewController alloc]init];
    thirdViewController.title = @"Third View";
    thirdViewController.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemRecents tag:2];
    UINavigationController *thirdNavController = [[UINavigationController alloc]initWithRootViewController:thirdViewController];

    ForthViewController *forthViewController = [[ForthViewController alloc]init];
    forthViewController.title = @"Forth View";
    forthViewController.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemHistory tag:2];
    UINavigationController *forthNavController = [[UINavigationController alloc]initWithRootViewController:forthViewController];

    tabBarController = [[UITabBarController alloc] initWithNibName:nil bundle:nil];
    tabBarController.viewControllers = [[NSArray alloc] initWithObjects:firstNavController, secondNavController, thirdNavController, forthNavController, nil];
    tabBarController.delegate = self;             
    [self sizeViewToAvailableWindow:[tabBarController view]];

    [firstNavController release];
    [firstViewController release];

    [secondNavController release];
    [secondViewController release];

    [thirdNavController release];
    [thirdViewController release];

    [forthNavController release];
    [forthViewController release];
}

这是以编程方式制作 TabBarController 的代码。
希望这会对您有所帮助。

Answer 3

这就是你可以做的

    SubClassViewController1* vc1 = [[SubClassViewController1 alloc] init];
    UINavigationController* nav1 = [[UINavigationController alloc] initWithRootViewController:vc1];
    nav1.navigationBar.hidden = YES;
    [vc1 release]; vc1 = nil;

    SubClassViewController2* vc2 = [[SubClassViewController2 alloc] init];
    vc2.title = @"List";
    UINavigationController* nav2 = [[UINavigationController alloc] initWithRootViewController:vc2];
    nav2.navigationBar.hidden = YES;
    [vc2 release]; vc2 = nil;

    SubClassViewController3* vc3 = [[SubClassViewController3 alloc] init];
    vc3.title = @"Scan";
    UINavigationController* nav3 = [[UINavigationController alloc] initWithRootViewController:vc3];
    nav3.navigationBar.hidden = YES;
    [vc3 release]; vc3 = nil;

    SubClassViewController4* vc4 = [[SubClassViewController4 alloc] init];
    vc4.title = @"Setting";
    UINavigationController* nav4 = [[UINavigationController alloc] initWithRootViewController:vc4];
    nav4.navigationBar.hidden = YES;
    [vc4 release]; vc4 = nil;

    UITabBarController* tabBar = [[UITabBarController alloc] init];
    [tabBar setViewControllers:[NSArray arrayWithObjects:nav1,nav2,nav3,nav4,nil]];

    [self.navigationController pushViewController:tabBar animated:YES];
    [nav1 release]; nav1 = nil;
    [nav2 release]; nav2 = nil;
    [nav3 release]; nav3 = nil;
    [nav4 release]; nav4 = nil;
    [tabBar release]; tabBar = nil;

这将创建一个带有四个选项卡的选项卡栏，每个选项卡都有自己的视图控制器和导航控制器，即每个选项卡维护自己的堆栈来推送和弹出视图控制器。
我希望这对U有帮助。

Answer 4

您可以执行以下操作：

UITabBar *tabBar = [[UITabBar alloc] initWithFrame:CGRectMake(0, 430, 320, 50)];
[self.view addSubview:tabBar];

要向其中添加一些项目，您可以编写：

NSMutableArray *tabBarItems = [[NSMutableArray alloc] init];
UITabBarItem *tabBarItem = [[UITabBarItem alloc] initWithTitle:@"Title" image:[UIImage imageNamed:@"Image.png"] tag:0];
UITabBarItem *tabBarItem1 = [[UITabBarItem alloc] initWithTitle:@"Title1" image:[UIImage imageNamed:@"Image1.png"] tag:1];
[tabBarItems addObject:tabBarItem];
[tabBarItems addObject:tabBarItem1];
tabBar.items = tabBarItems;
tabBar.selectedItem = [tabBarItems objectAtIndex:0];