以编程方式将选项卡栏控制器添加到当前 App Flow

Posted 2023-02-23

【中文标题】以编程方式将选项卡栏控制器添加到当前 App Flow

【英文标题】：Add a Tab Bar Controller Programmatically to current App Flow

【发布时间】：2013-05-06 10:06:55

【问题描述】：

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新的视图控制器，其中包含用户登录的 Web 视图，登录后我想带他到他的主页，其中导航栏有他的名字和右侧的注销按钮.主页还应该有一个带有 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 并让它工作。我对在哪里添加用于添加 TabBar 的代码感到困惑。我正在使用下面的代码添加标签栏 -

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];

目前，我已将上述代码放在扩展 UITabBarController 的 ViewController TabViewController 的 viewDidLoad 中。在我的 webView 控制器中，我输入了以下代码 -

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

但是，当我单击已打开的选项卡以外的任何选项卡时，应用程序就会崩溃。 请帮忙。

【问题讨论】：

你必须检查你的视图树...在哪个视图中添加标签栏..

我想在登录后出现的视图中添加tabBar - 即视图树中webview之后的视图。

您是否尝试创建一个UINavigationController 作为根视图控制器并在登录时推送您的 TabViewController ？

【参考方案1】：

我过去这样做的方法是创建一个 UITabBarController 子类，其中包含您上面的所有 tabBar 创建代码。

然后使用您的UINavigationController 将tabBar 子类推送到屏幕上。

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];      

【参考方案2】：

设置委托UITabBarDelegate

这里是 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;