自定义导航栏背景图片和颜色

首先准备导航栏背景图片，大小 320x44, @2x文件大小640x88，iOS5以后更改背景图片较简单

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];
    }
}

更改颜色，可以使用tintColor属性

myBar.tintColor = [UIColor greenColor];