在后续类IPHONE应用程序中获取应用程序窗口的引用

Question

我在第4屏幕上添加了标签控制器。最多4个屏幕，我的导航栏可见     现在在第4个屏幕上，当我将Tab Controller添加到窗口时，导航栏正在消失......

code written in the tabbedController class is :




- (void)viewDidLoad
{
        self.tabController = [[UITabBarController alloc]init];
    FirstTabScreen *firstTab = [[FirstTabScreen alloc]initWithNibName:nil bundle:nil];
    SecondTabScreen *secondTab = [[SecondTabScreen alloc]initWithNibName:nil bundle:nil];

    firstTab.title=@"First";
    firstTab.tabBarItem.image = [UIImage imageNamed:@"small_star.png"];
    secondTab.title=@"second";
    secondTab.tabBarItem.image = [UIImage imageNamed:@"small_star.png"];

    tabController.viewControllers = [NSArray arrayWithObjects:
                                     firstTab,
                                     secondTab,
                                     nil];

  //  self.tabWindow = [[[[UIApplication sharedApplication]keyWindow ]subviews ] lastObject];

    //self.tabWindow = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
   // self.tabWindow = [[UIApplication sharedApplication] keyWindow ];
    //self.tabWindow = self.appDelegateAccess.window;
    self.tabWindow = self.appDelegateAccess.window;
    [self.tabWindow addSubview:tabController.view];
    [self.tabWindow makeKeyAndVisible];


  //  [self.view addSubview:tabsContainer.view];

    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.
}

请让我知道我哪里出错了.... 我想我没有引用添加选项卡控制器的根窗口。 它是这种情况，请建议我采取根窗口添加标签控制器的方法

由于

Answer 1

为什么要在窗口中添加tabbarcontroller。为什么不在self.view中添加它？

Answer 2

首先在YourAppDelegate中创建tabBar的对象。并在以下methode中编写以下代码

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.tabController = [[UITabBarController alloc]init];

    FirstTabScreen *firstTab = [[FirstTabScreen alloc]initWithNibName:nil bundle:nil];
    SecondTabScreen *secondTab = [[SecondTabScreen alloc]initWithNibName:nil bundle:nil];

    firstTab.title=@"First";
    firstTab.tabBarItem.image = [UIImage imageNamed:@"small_star.png"];
    secondTab.title=@"second";
    secondTab.tabBarItem.image = [UIImage imageNamed:@"small_star.png"];

    tabController.viewControllers = [NSArray arrayWithObjects:
                                     firstTab,
                                     secondTab,
                                     nil];

    /*
        Your Other Code
    */
}

然后在您的第三个View控制器的.m文件中导入您的appDelegate，如..

#import "YourAppDelegate.h"

上一步在选择第三个视图控制器的行时编写以下代码...

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
     YourAppDelegate * appDel = (YourAppDelegate *)[[UIApplication SharedApplication] delegate];
     [appDel.window setRootViewController:appDel.tabController];

}

Answer 3

您需要单独添加导航控制器，

试试这个，

self.tabController = [[UITabBarController alloc]init];
FirstTabScreen *firstTab = [[FirstTabScreen alloc]initWithNibName:nil bundle:nil];
SecondTabScreen *secondTab = [[SecondTabScreen alloc]initWithNibName:nil bundle:nil];

UINavigationController *navControllerOne = [[UINavigationController alloc] initWithRootViewController: firstTab];
navControllerOne.navigationBar.tintColor = [UIColor blackColor];
navControllerOne.tabBarItem.image=[UIImage imageNamed:@"star.png"];
navControllerOne.tabBarItem.title = @"First";

UINavigationController *navControllerTwo = [[UINavigationController alloc] initWithRootViewController: secondTab];
navControllerTwo.navigationBar.tintColor = [UIColor blackColor];
navControllerTwo.tabBarItem.image=[UIImage imageNamed:@"star.png"];
navControllerTwo.tabBarItem.title = @"Second";

tabController.viewControllers = [NSArray arrayWithObjects:
                                         navControllerOne,
                                         navControllerTwo,
                                         nil];

      //  self.tabWindow = [[[[UIApplication sharedApplication]keyWindow ]subviews ] lastObject];

        //self.tabWindow = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
       // self.tabWindow = [[UIApplication sharedApplication] keyWindow ];
        //self.tabWindow = self.appDelegateAccess.window;
        self.tabWindow = self.appDelegateAccess.window;
        [self.tabWindow addSubview:tabController.view];
        [self.tabWindow makeKeyAndVisible];


      //  [self.view addSubview:tabsContainer.view];

Answer 4

好极了!!!!它修复了......

我已删除

 self.tabWindow = self.appDelegateAccess.window;
    [self.tabWindow addSubview:tabController.view];
    [self.tabWindow makeKeyAndVisible];

并且只添加了一行

[self.view addSubview:tabController.view];

最后它有效!!!

感谢Rohit ..