UINavigationController的高度问题

Question

UINavigationController *navController = [[UINavigationController alloc] initWithRootController：rootController];

这个时候navController.view 的高度是480，到了rootController后，self.navigationController.view的高度怎么又变成了460？？？

确实是有个地方修改了frame，我还是有个疑问，既然navigationcontroller 的view高度是480,为什么导航是从status bar下面开始显示的？？ 是不是在navigationController的initWithRootViewController:rootViewController方法里，把navigationController的view frame修改成rootViewController的view frame了，不然解释不通啊

Answer 1

我勒个去~~~这么诡异，我在我的应用里打印了一把，都是480的。但是你提到的情况，很可能是某个操作影响了status bar，造成navController的高度变了。因为iPhone里只有status bar的高度是20像素的。
能贴一下其他代码么？看看问题出在哪里

一下是我的代码和输出结果：
TestAppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    
    self.viewController = [[TestViewController alloc] init];
    self.navController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
    
    NSLog(@"height:%f", self.navController.view.frame.size.height);
    
    [self.window addSubview:self.navController.view];
    
    NSLog(@"height:%f", self.navController.view.frame.size.height);
    
    return YES;
}

TestViewController.m

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view.
    
    NSLog(@"height:%f", self.navigationController.view.frame.size.height);
}

三个NSLog打印出来的都是480

2012-09-19 23:43:13.561 NAVTest[1132:c07] height:480.000000
2012-09-19 23:43:13.562 NAVTest[1132:c07] height:480.000000
2012-09-19 23:43:13.563 NAVTest[1132:c07] height:480.000000