Question

在我的App中的语言切换上，我需要在TabBar中访问MoreViewController的视图并更改其标题。

有人可以告诉我该怎么做吗？

非常感谢您的帮助。

列数

Answer 1

以下是一些可能适合您的代码段。请注意，以下所有内容都会因每个新版本的iOS版本而中断。

自定义更多视图标题本身以及用户正在编辑的标题。

- (void)customizeTitleViewWithNavigationItem:(UINavigationItem *)navigationItem
{
    VASSERT(navigationItem != nil, @"invalid navigationItem supplied", navigationItem);
    UILabel *titleView = [[UILabel alloc] initWithFrame:CGRectZero];
    titleView.backgroundColor = [UIColor clearColor];
    titleView.font = [UIFont boldSystemFontOfSize:20.0f];
    titleView.text = navigationItem.title;
    [titleView sizeToFit];
    navigationItem.titleView = titleView;
    [titleView release];
}

这需要在UINavigationController的委托中实施;

- (void)navigationController:(UINavigationController *)navigationController 
      willShowViewController:(UIViewController *)viewController 
                    animated:(BOOL)animated
{
    if (navigationController == tabBarController_.moreNavigationController)
    {
        if ([viewController isKindOfClass:NSClassFromString(@"UIMoreListController")])
        {
            [self customizeTitleViewWithNavigationItem:viewController.navigationItem];
        }
        else
        {
            NSLog(@"viewController (%@) does not seem to be a UIMoreListController", viewController);
        }
    }
    else
    {
        NSLog(@"navigationController (%@) does not seem to be the moreNavigationController", navigationController);
    }
}

这需要在UITabBarController的委托中实施;

- (void)tabBarController:(UITabBarController *)controller willBeginCustomizingViewControllers:(NSArray *)viewControllers 
{
    //get the second view of the upcoming tabbar-controller
    UIView *editView = [controller.view.subviews objectAtIndex:1];
    //did we get what we expected, which is a UITabBarCustomizeView?
    if (editView != nil && [editView isKindOfClass:NSClassFromString(@"UITabBarCustomizeView")])
    {   //yes->get the navigation-view
        UIView *navigationView = [editView.subviews objectAtIndex:0];
        //is that a navigationBar?
        if (navigationView != nil && [navigationView isKindOfClass:[UINavigationBar class]])
        {   //yes->...
            UINavigationBar *navigationBar = (UINavigationBar *)navigationView;
            [self customizeTitleViewWithNavigationItem:navigationBar.topItem];
        }
        else
        {
            NSLog(@"the navigationView (%@) does not seem to be a navigationBar", navigationView);
        }
    }
    else
    {
        NSLog(@"the editView (%@) does not seem to be a UITabBarCustomizeView", editView);
    }
}

Answer 2

我能够使用以下代码更改第6个视图控制器（更多列表中的最后一个）的tabBar项目之一的标题：

NSArray *vcs = [(UITabBarController *)self.window.rootViewController viewControllers];
[[vcs.lastObject tabBarItem] setTitle:@"New Title"];

这是你想要做的吗？

编辑后：要在第一次设置这些标题后更改这些标题，您需要重新设置tabBar控制器的viewControllers属性。在这个代码示例中，我将第6个视图控制器中的一个按钮连接到一个动作方法，该方法更改了3个控制器的标题，2个位于更多列表中，1个位于常规列表中。

  -(IBAction)changeNames:(id)sender {
    UITabBarController *tbc = (UITabBarController *)[[UIApplication sharedApplication] delegate].window.rootViewController;
    NSArray *vcs = tbc.viewControllers;
    [[vcs.lastObject tabBarItem] setTitle:@"New Title"];
    [[[vcs objectAtIndex:4] tabBarItem] setTitle:@"New VC"];
    [[[vcs objectAtIndex:3] tabBarItem] setTitle:@"New VC2"];
    tbc.viewControllers = tbc.viewControllers;
}

如何访问MoreViewController的视图并更改其标题？

2 个答案: