在viewcontroller或AppDelegate中只添加此代码

if([[[UIDevice currentDevice] systemVersion] floatValue] < 7.0)
{
    //This is For iOS6
    [self.navigationController.navigationBar setTintColor:[UIColor yellowColor]];
}
else
{
    //This is For iOS7
    [self.navigationController.navigationBar setBarTintColor:[UIColor yellowColor]];
}

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];

它实际上比我在这里看到的答案更简单:

1) Just make sure you select the navigation bar on the Navigation control. 
2) Select the color you want in the bar tint.
3) You have other options too, and/or individually on each view (just play with it).

我希望这能帮助到一些人。我不喜欢我看到的答案。我喜欢让我的代码尽可能的干净。并不是说用编程的方式做这件事是错误的，但确实有像我这样的人....这是给你们的。

//You could place this code into viewDidLoad
- (void)viewDidLoad
{
    [super viewDidLoad];
    self.navigationController.navigationBar.tintColor = [UIColor redColor];
    //change the nav bar colour
    self.navigationController.view.backgroundColor = [UIColor redColor];
    //change the background colour
    self.navigationController.navigationBar.translucent = NO;
 }   
//Or you can place it into viewDidAppear
- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:(BOOL)animated];
    self.navigationController.navigationBar.tintColor = [UIColor redColor];
    //change the nav bar colour
    self.navigationController.view.backgroundColor = [UIColor redColor];
    //change the background colour
    self.navigationController.navigationBar.translucent = NO;
}

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];
}

tintColor对条形图的行为在ios7.0中发生了改变。它不再影响酒吧的背景。

从文档中可以看到:

barTintColor类引用

要应用于导航栏背景的色调。

@property(nonatomic, retain) UIColor *barTintColor

讨论 默认情况下，这种颜色是半透明的，除非你将半透明属性设置为NO。

可用性

支持iOS 7.0及以上版本。

中声明 UINavigationBar.h

Code

NSArray *ver = [[UIDevice currentDevice].systemVersion componentsSeparatedByString:@"."];
if ([[ver objectAtIndex:0] intValue] >= 7) {
    // iOS 7.0 or later   
    self.navigationController.navigationBar.barTintColor = [UIColor redColor];
    self.navigationController.navigationBar.translucent = NO;
}else {
    // iOS 6.1 or earlier
    self.navigationController.navigationBar.tintColor = [UIColor redColor];
}

我们也可以使用这个来检查iOS版本，正如iOS 7 UI过渡指南中提到的那样

if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1) {
        // iOS 6.1 or earlier
        self.navigationController.navigationBar.tintColor = [UIColor redColor];
    } else {
        // iOS 7.0 or later     
        self.navigationController.navigationBar.barTintColor = [UIColor redColor];
        self.navigationController.navigationBar.translucent = NO;
    }

编辑 使用xib