Question

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，在点击时打开一个带有Web视图的新视图控制器，用户登录，登录后我想带他到他的主页，导航栏上有他的名字，右边有一个注销按钮。主页还应该有一个带有3个不同选项卡的标签栏。我可以从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。我很困惑在哪里添加添加TabBar的代码。我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];

目前我已将上述代码放在ViewController TabViewController的viewDidLoad中，该窗口扩展了UITabBarController。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，只要点击已打开的标签以外的其他标签，应用就会崩溃。请帮助。

Answer 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。

以下是我的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];      
}

Answer 2

设置委托UITabBarDelegate

这里是TabBar Viewcontroller图像 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;
    }
}

以编程方式将Tab键控制器添加到当前App Flow

2 个答案: