更改 UINavigationBar 的颜色

Question

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{
self.navigationController.navigationBar.tintColor = [UIColor blackColor];
if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) 
{       
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
                                                                                          target:self
                                                                                          action:@selector(cancel)];

    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Send to Twitter"
                                                                              style:UIBarButtonItemStyleDone
                                                                             target:self
                                                                             action:@selector(save)];

}
return self;
}

另一段代码

 - (void)loadView 
    {
[super loadView];

self.navigationController.navigationBar.tintColor = [UIColor blackColor];
self.view.backgroundColor = [UIColor whiteColor];

self.textView = [[UITextView alloc] initWithFrame:self.view.bounds];
textView.delegate = self;
textView.font = [UIFont systemFontOfSize:15];
textView.contentInset = UIEdgeInsetsMake(5,5,0,0);
textView.backgroundColor = [UIColor whiteColor];    
textView.autoresizesSubviews = YES;
textView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

[self.view addSubview:textView];
}

我试图将导航栏颜色更改为黑色的 ，但是无论我在这里做什么，颜色仍然保持默认值（蓝色）。如何更改视图顶部栏的颜色？

Answer 1

尝试如下：

self.navigationController.navigationBar.barStyle = UIBarStyleBlack;

这应该在 viewWillAppear: 上完成，就像在 init 方法 self 期间一样.navigationController 将被获取为 nil，因此不会产生任何效果。

希望这有帮助。

Answer 2

如果您使用编程方法（似乎没有），您可以编写这段代码

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

// Override point for customization after application launch.

// window initialization
window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

YourViewController *viewController = [[YourViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc] \
initWithRootViewController:viewController];
[viewController release];
[[navigationController navigationBar] setTintColor:[UIColor blackColor]];
[window addSubview:navigationController.view];

[self.window makeKeyAndVisible];

return YES;

}

它对我有用。希望有帮助！ ;)