“标题”的问题在 UINavigationController 中

Question

我的标题和 UINavigationController 遇到问题。我在 UIViewControllerCurrent 使用以下代码，当我从 NextViewController 返回时，导航栏的标题仍然是“上一个”..任何人都可以帮我解决这个问题吗？谢谢。

[self setTitle:@"Previous"]; 
NextViewController *controller = [[NextViewController alloc] init]; 
[[self navigationController] pushViewController:controller animated:YES]; 
[controller release], controller = nil; 

- (void)viewWillAppear:(BOOL)animated; {     
[self setTitle:@"Real Title"];     
[super viewWillAppear:animated]; } 

Answer 1

我会尝试交换这两行，

[self setTitle:@"Real Title"];     
[super viewWillAppear:animated];

以便您得到

[super viewDidAppear:animated];
[self setTitle:@"Real Title"];

，我会将它们放入 viewDidAppear 中。

Answer 2

尝试使用下面的 UINavigationController 委托方法。

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated;
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated;

使用委托方法之一来更改标题。

Answer 3

如果 dasdoms 解决方案不起作用，请尝试以下操作。

在弹出之前的 NextViewController 中运行此代码。

for (int i =0; i < [[self.navigationController viewControllers] count]; i++)
    {
        UIViewController *aController = [[self.navigationController viewControllers] objectAtIndex:i];

        if ([aController isKindOfClass:[PreviousViewController class]])
        {
            PreviousViewController *aPreviousViewController = (PreviousViewController *)aController;
            aPreviousViewController.title = @" Real Title";
        }

    }