修改导航栏的背景图片，可按照下面的方法操作：

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UINavigationBar *navBar = self.navigationController.navigationBar;  
  
#define kSCNavBarImageTag 10  
if ([navBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)])  
{  
    //if iOS 5.0 and later  
    [navBar setBackgroundImage:[UIImage imageNamed:@"navbar1.png"] forBarMetrics:UIBarMetricsDefault];  
}  
else  
{  
    UIImageView *imageView = (UIImageView *)[navBar viewWithTag:kSCNavBarImageTag];  
    if (imageView == nil)  
    {  
        imageView = [[UIImageView alloc] initWithImage:  
                     [UIImage imageNamed:@"navbar1.png"]];  
        [imageView setTag:kSCNavBarImageTag];  
        [navBar insertSubview:imageView atIndex:0];  
        [imageView release];  
    }  
}

修改导航栏的背景色的方法，可按照下面的办法来操作：

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navBar.tintColor = [UIColor greenColor];