自定义导航栏背景图片和颜色

转自：http://blog.csdn.net/sirchenhua/article/details/7415851

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