Ios UINavigationBar-将新控制器推送到UINavigationController堆栈时从未调用pushNavigationItem

今晚我要做一些测试，看看本机

UINavigationBar

的行为。我创建了一个简单的代码段，它执行以下操作：

- (void)pushController {
    PHViewController *ctrl2 = [[[PHViewController alloc] initWithNibName:@"PHViewController" bundle:nil] autorelease];
    ctrl2.shouldShowPrompt = YES;
    [self.viewController pushViewController:ctrl2 animated:YES];
}


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    PHViewController *ctrl = [[[PHViewController alloc] initWithNibName:@"PHViewController" bundle:nil] autorelease];
    ctrl.shouldShowPrompt = YES;
    ctrl.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:@"Push" 
                                                                           style:UIBarButtonItemStyleDone
                                                                          target:self
                                                                          action:@selector(pushController)] autorelease];

    self.viewController = [[[PHNavigationController alloc] initWithRootViewController:ctrl] autorelease];
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

现在，我已经对

UINavigationController

的

UINavigationBar

进行了子类化（我知道这是非法的，这是一个教育问题），并覆盖了以下方法：

- (void)setItems:(NSArray *)items animated:(BOOL)animated {
    NSLog(@"Setting Navigation Item");
    [super setItems:items animated:animated];
}

- (void)pushNavigationItem:(UINavigationItem *)item animated:(BOOL)animated  {
    NSLog(@"Pushing Navigation Item");
    [super pushNavigationItem:item animated:animated];
}

- (UINavigationItem *)popNavigationItemAnimated:(BOOL)animated {
    NSLog(@"Poping Navigation Item");
    return [super popNavigationItemAnimated:animated];
}

- (void)setValue:(id)value forKeyPath:(NSString *)keyPath {
    NSLog(@"Setting Value: %@ for keyPath:%@", value, keyPath);
    [super setValue:value forKeyPath:keyPath];
}

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这里是我的问题：为什么控制台中存在“弹出导航项”（因此调用了该方法）而“推送导航项”不存在？

我找到了原因：它调用-（void）pushNavigationItem:（UINavigation*）项，而不调用-（void）pushNavigationItem:动画

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无论如何谢谢你

这是一个解决方案，适用于任何像我一样挣扎的人。在使用自定义

UINavigationBar

的自定义

UINavigationController

子类中，使用以下代码覆盖

pushViewController

方法：

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    [super setViewControllers:[self.viewControllers arrayByAddingObject:viewController]
                     animated:animated];
}

然后在自定义

UINavigationBar

子类中，您可以自定义

navigationItems

如下所示：

- (void)pushNavigationItem:(UINavigationItem *)item animated:(BOOL)animated
{
    // customize your navigationItem here...

    [super pushNavigationItem:item animated:animated];
} 

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谢谢不幸的是，

-（void）pushNavigationItem:（UINavigation*）项是私有的，这限制了导航栏的可定制性。如果是这样，我们是否必须覆盖
UINavigationController
的push和pop方法来调用导航栏的
pushNavigationItem:animated:
方法？我认为在导航控制器中使用
UINavigationBar
子类并不“非法”。毕竟，您可以在Interface Builder中轻松配置它。所以你的问题是绝对正确的。哪个部分不起作用？我现在正在应用程序中使用此代码。为我工作。干得好@lan hoar你觉得这个方法怎么样