ios 以编程方式将标签栏控制器添加到当前应用程序流

Add a Tab Bar Controller Programmatically to current App Flow

提问by Akshay Goel

I want to add a tab Bar Controller to my current App Flow. Currently I have a page with a button which on clicking opens a new viewcontroller with a web view where the user logs in and after login I want to take him to his home Page where the navigation bar has his name and a logout button in the right. The home page should also have a tab bar with 3 different tabs. I am able to load the home page view from the webview and get the navigation bar. But I am unable to add the tabBar and get it working. I am confused as to where to add the code for adding TabBar. I am using the below code to add tab bar -

我想在我当前的 App Flow 中添加一个标签栏控制器。目前我有一个带有按钮的页面，单击该按钮会打开一个带有 Web 视图的新视图控制器，用户可以在其中登录，登录后我想带他到他的主页，其中导航栏有他的名字，右侧有一个注销按钮. 主页还应该有一个包含 3 个不同选项卡的选项卡栏。我能够从 webview 加载主页视图并获取导航栏。但我无法添加 tabBar 并使其正常工作。我对在哪里添加用于添加 TabBar 的代码感到困惑。我正在使用以下代码添加标签栏 -

UITabBarController *tabBar = [[UITabBarController alloc] init];

HomeViewController *home = [[PPHomeViewController alloc] initWithUserName:[self.userInfo objectForKey:@"name"] Email:[self.userInfo objectForKey:@"email"] Phone:[self.userInfo objectForKey:@"phone_number"]];
home.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:1];
UINavigationController *homeNavController = [[UINavigationController alloc]initWithRootViewController:home];

RequestViewController *req = [[RequestMoneyViewController alloc]init];
req.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:2];
UINavigationController *reqNavController = [[UINavigationController alloc]initWithRootViewController:req];

UIViewController *thirdViewController = [[UIViewController alloc]init];
thirdViewController.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:3];
UINavigationController *thirdNavController = [[UINavigationController alloc]initWithRootViewController:thirdViewController];

UIViewController *fourthViewController = [[UIViewController alloc]init];
thirdViewController.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:3];
UINavigationController *fourthNavController = [[UINavigationController alloc]initWithRootViewController:fourthViewController];

tabBar.viewControllers = [[NSArray alloc] initWithObjects:homeNavController, reqNavController, thirdNavController, fourthNavController, nil];
tabBar.delegate=self;
tabBar.selectedIndex=0;

UIImageView *homeImg=[[UIImageView alloc]initWithFrame:CGRectMake(0, 432, 80, 49)];
homeImg.tag=11;
homeImg.image=[UIImage imageNamed:@"footer"];

UIImageView *reqImg=[[UIImageView alloc]initWithFrame:CGRectMake(81, 432,80, 49)];
reqImg.tag=12;
reqImg.image=[UIImage imageNamed:@"footer"];

UIImageView *sendImg=[[UIImageView alloc]initWithFrame:CGRectMake(162, 432,80, 49)];
sendImg.tag=13;
sendImg.image=[UIImage imageNamed:@"footer"];

UIImageView *localImg=[[UIImageView alloc]initWithFrame:CGRectMake(243, 432, 80, 49)];
localImg.tag=14;
localImg.image=[UIImage imageNamed:@"footer"];

[tabBar.view addSubview:homeImg];
[tabBar.view addSubview:reqImg];
[tabBar.view addSubview:sendImg];
[tabBar.view addSubview:localImg];

[[[UIApplication sharedApplication]keyWindow]addSubview:tabBar.view];

Currently I have put the above code in the viewDidLoad of a ViewController TabViewController which extends UITabBarController. In my webView controller I have put the following code -

目前我已经把上面的代码放在一个 ViewController TabViewController 的 viewDidLoad 中，它扩展了 UITabBarController。在我的 webView 控制器中，我放置了以下代码 -

TabViewController *tab=[[TabViewController alloc] init];
tab.userInfo=userInfo;
[self presentViewController:tab animated:YES completion:nil];

But the app crashes as soon as I click any tab other than the one already open. Please Help.

但是，只要我单击已打开的选项卡以外的任何选项卡，应用程序就会崩溃。请帮忙。

回答by andrew lattis

The way I've done this in the past is to create a UITabBarControllersubclass that contains all of the tabBarcreation code you have above.

我过去这样做的方法是创建一个UITabBarController包含上面所有tabBar创建代码的子类。

Then use your UINavigationControllerto push the tabBarsubclass to the screen.

然后使用您UINavigationController的将tabBar子类推送到屏幕。

Here's a sample of my UITabBarControllersubclass:

这是我的UITabBarController子类的示例：

- (void)viewDidLoad {
    [super viewDidLoad];

    UIViewController *view1 = [[UIViewController alloc] init];
    UIViewController *view2 = [[UIViewController alloc] init];
    UIViewController *view3 = [[UIViewController alloc] init];

    NSMutableArray *tabViewControllers = [[NSMutableArray alloc] init];
    [tabViewControllers addObject:view1];
    [tabViewControllers addObject:view2];
    [tabViewControllers addObject:view3];

    [self setViewControllers:tabViewControllers];
    //can't set this until after its added to the tab bar
    view1.tabBarItem = 
      [[UITabBarItem alloc] initWithTitle:@"view1" 
                                    image:[UIImage imageNamed:@"view1"] 
                                      tag:1];
    view2.tabBarItem = 
      [[UITabBarItem alloc] initWithTitle:@"view2" 
                                    image:[UIImage imageNamed:@"view3"] 
                                      tag:2];
    view3.tabBarItem = 
      [[UITabBarItem alloc] initWithTitle:@"view3" 
                                    image:[UIImage imageNamed:@"view3"] 
                                      tag:3];      
}

回答by Manjeet

Set Delegate UITabBarDelegate

设置委托 UITabBarDelegate

here TabBar Viewcontroller image http://prntscr.com/ba5oks

这里 TabBar Viewcontroller 图片 http://prntscr.com/ba5oks

#pragma mark- Tapbar delegate

- (void)deselectTabBarItem:(UITabBar*)tabBar
{
    tabBar.selectedItem = nil;
}

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item
{
    [self performSelector:@selector(deselectTabBarItem:) withObject:tabBar afterDelay:0.2];

    switch (item.tag) {
        case 0:
            //perform action
            break;
        case 1:
            //do whatever you want to do.
            break;
        case 2:
            //call method
            break;
        default:
            break;
    }
}