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];
}

如果你想使用十六进制代码，这里是最好的方法。

首先，在类的顶部定义它:

#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]

然后在“application didFinishLaunchingWithOptions”里面，放这个:

[[UINavigationBar appearance] setBarTintColor:UIColorFromRGB(0x00b0f0)];

把十六进制代码放在00b0f0的位置。

- (void)viewDidLoad
{
    [super viewDidLoad];

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

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];
    }
}

#define _kisiOS7 ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)


  if (_kisiOS7)
    {
        [[UINavigationBar appearance] setBarTintColor:[UIcolor redcolor]];
    }
    else
    {
        [[UINavigationBar appearance] setBackgroundColor:[UIcolor blackcolor]];
        [[UINavigationBar appearance] setTintColor:[UIcolor graycolor]];
    }

颜色:

[[UINavigationBar appearance] setBarTintColor:[UIColor blackColor]];

的图像

[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"navigationBar_320X44.png"] forBarMetrics:UIBarMetricsDefault];