为了使Rajneesh071的代码完整，你可能还想设置导航栏的标题颜色(和字体，如果你想要的话)，因为默认行为从iOS 6改变到7:

NSArray *ver = [[UIDevice currentDevice].systemVersion componentsSeparatedByString:@"."];
if ([[ver objectAtIndex:0] intValue] >= 7)
{
    self.navigationController.navigationBar.barTintColor = [UIColor blackColor];
    self.navigationController.navigationBar.translucent = NO;
    NSMutableDictionary *textAttributes = [[NSMutableDictionary alloc] initWithDictionary:mainNavController.navigationBar.titleTextAttributes];
    [textAttributes setValue:[UIColor whiteColor] forKey:UITextAttributeTextColor];
    self.navigationController.navigationBar.titleTextAttributes = textAttributes;
}
else
{
    self.navigationController.navigationBar.tintColor = [UIColor blackColor];
}

如果你需要支持ios6和ios7那么你在你的UIViewController中使用这个得到那个特别的浅蓝色:

- (void)viewDidLoad {
    [super viewDidLoad];
    NSArray *ver = [[UIDevice currentDevice].systemVersion componentsSeparatedByString:@"."];
    if ([[ver objectAtIndex:0] intValue] >= 7) {
        self.navigationController.navigationBar.barTintColor = [UIColor colorWithRed:89/255.0f green:174/255.0f blue:235/255.0f alpha:1.0f];
        self.navigationController.navigationBar.translucent = NO;
    }else{
        self.navigationController.navigationBar.tintColor = [UIColor colorWithRed:89/255.0f green:174/255.0f blue:235/255.0f alpha:1.0f];
    }
}

在viewDidLoad中，设置:

    self.navigationController.navigationBar.barTintColor = [UIColor blueColor];

更改(blueColor)为任何你想要的颜色。

在一个基于导航的应用程序中，你可以把代码放在AppDelegate中。更详细的代码可以是:

// Navigation bar appearance (background and title)

[[UINavigationBar appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor titleColor], NSForegroundColorAttributeName, [UIFont fontWithName:@"FontNAme" size:titleSize], NSFontAttributeName, nil]];

[[UINavigationBar appearance] setTintColor:[UIColor barColor]];

// Navigation bar buttons appearance

[[UIBarButtonItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor textBarColor], NSForegroundColorAttributeName, shadowColor, NSShadowAttributeName, [UIFont fontWithName:@"FontName" size:titleSize], NSFontAttributeName, nil];

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.navigationController.navigationBar.barTintColor = [UIColor blueColor];
}

为了使Rajneesh071的代码完整，你可能还想设置导航栏的标题颜色(和字体，如果你想要的话)，因为默认行为从iOS 6改变到7:

NSArray *ver = [[UIDevice currentDevice].systemVersion componentsSeparatedByString:@"."];
if ([[ver objectAtIndex:0] intValue] >= 7)
{
    self.navigationController.navigationBar.barTintColor = [UIColor blackColor];
    self.navigationController.navigationBar.translucent = NO;
    NSMutableDictionary *textAttributes = [[NSMutableDictionary alloc] initWithDictionary:mainNavController.navigationBar.titleTextAttributes];
    [textAttributes setValue:[UIColor whiteColor] forKey:UITextAttributeTextColor];
    self.navigationController.navigationBar.titleTextAttributes = textAttributes;
}
else
{
    self.navigationController.navigationBar.tintColor = [UIColor blackColor];
}