2

我试图从另一个类打印这个值，但它总是将选定tabbar的索引显示为 0

为什么？有没有其他方法可以确定现在选择了哪个选项卡？

在我的第二类tableviewcontroller didselect`方法中，我正在尝试打印以下行

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    sharedManager=[Mymanager sharedManager]; 
    sharedManager.navigationBarTitle=[name objectAtIndex:indexPath.row];   
    NSLog(@"%d",self.tabBarController.selectedIndex);

}

但它总是显示0？

我需要不同标签的不同索引吗？

我的意图是识别选项卡并调用方法现在我将其更改为调用四种不同的方法但是当我创建一个对象并尝试调用方法时它不显示为什么？

我的APPdelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    [NSThread sleepForTimeInterval:5.0];
    [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
      [[NSNotificationCenter defaultCenter] postNotificationName:@"internet connection" object:self];
    dispatch_queue_t connectivityThread = dispatch_queue_create("com.ttt.test.connectivity", NULL);

    dispatch_async(connectivityThread, ^{
        while (true){
            if([GMMConnectivity hasConnectivity])
                            [[NSNotificationCenter defaultCenter] postNotificationName:@"InternetCheck" object:[NSNumber numberWithBool:YES]];
            else
              [[NSNotificationCenter defaultCenter] postNotificationName:@"InternetCheck" object:[NSNumber numberWithBool:NO]];

            usleep(5000000);
        }
    });

    return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application
{
  // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
  // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}

- (void)applicationDidEnterBackground:(UIApplication *)application
{
  // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 
  // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.


}
//-(void)recentPages:(NSString *)pageNumber
//{
//    //NSLog(@"%@",pageNumber);
//}

- (void)applicationWillEnterForeground:(UIApplication *)application
{
  // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
  // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

- (void)applicationWillTerminate:(UIApplication *)application
{
  // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
4

5 回答 5

2

尝试这个

NSUInteger index = [self.tabBarController.tabBar.items indexOfObject:self.tabBarController.tabBar.selectedItem];    
NSLog(@"Index: %d", index);
于 2013-10-25T07:49:59.230 回答
0

对于 TabbarController 索引更改，您需要实现其委托协议。此委托协议应作为 rootviewcontroller 实现或添加到您要添加 tabbarcontroller 的任何 viewcontroller 中

#pragma mark - 
#pragma mark - Tab bar Delegate

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{

    int i=tabBarController.selectedIndex;

    NSLog(@"selected tab index => %d", i);

    switch (i) {

        case 0:
            [tabBarController setSelectedIndex:i];
            break;

        case 1:
            [tabBarController setSelectedIndex:i];
            break;

        case 2:
            [tabBarController setSelectedIndex:i];
            break;

        case 3:
            [tabBarController setSelectedIndex:i];
            break;

        default:
            break;
    }

}

在标签栏的每个索引处，您必须实现不同的 - 不同的视图控制器，并且在每个子视图控制器的 viewWillAppear 内部，您可以记录其索引值。

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    AppDelegate *appDel = (AppDelegate *)[[UIApplication sharedApplication] delegate];

    NSLog(@"selected tab value=> %d", appDel.tabBarController.selectedIndex);


}

我希望它对你有帮助。

于 2013-05-31T05:24:57.043 回答
0

试试这个代码

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSLog(@"selected tab index => %d", appDelegate.tabBarController.selectedIndex);
于 2013-05-31T05:21:39.030 回答
0

您可以获取标签栏的对象并获取它的选定索引。假设您在应用程序委托中有标签栏。因此，从下面的代码中，您可以获得标签栏的选定索引。

MyAppDelegate *appDelegate = (MyAppDelegate *)[[UIApplication sharedApplication] delegate];
NSLog(@"%d", appDelegate.tabBarController.selectedIndex);
于 2013-05-31T05:23:22.370 回答
0

如果您想获取所选项目并在选项卡委托中设置相同的变量，请创建一个变量，以便在您的类中访问它。

@interface iPadAppDelegate : NSObject < UITabBarControllerDelegate>

(void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController

(BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController

希望这可以帮助

于 2013-05-31T05:39:25.900 回答