如何访问MoreViewController的视图并更改其标题？

Question

在我的应用程序中的语言切换上，我需要访问TabBar中MoreViewController的视图并更改它们的标题。

任何人都可以请告诉我该怎么做？

你的帮助是非常赞赏。

列数

Answer 1

下面是一些片段，可能为你工作。请注意，下面的所有内容都有可能在每个新的iOS发行版上发生变化，但这并不意味着要完成。

---

自定义更多视图标题以及用户正在编辑时的标题。

- (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的代表内实施;

- (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的代表内实施;

- (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

我可以用下面的代码来改变我的第六视图控制器使用TabBar项目之一（最后一个在多个列表）的标题：

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

这就是你想做？

编辑后：要在第一次设置它们后更改这些标题，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操作方法，该方法更改了我的控制器中3个的标题，更多列表中的2个和常规列表中的一个。

-(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; 
}