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

1. UINavigationBar *navBar = self.navigationController.navigationBar;
2.  
3. #define kSCNavBarImageTag 10
4. if ([navBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)])
5. { 
6.     //if iOS 5.0 and later 
7.     [navBar setBackgroundImage:[UIImage imageNamed:@"navbar1.png"] forBarMetrics:UIBarMetricsDefault];
8. } 
9. else 
10. { 
11.     UIImageView *imageView = (UIImageView *)[navBar viewWithTag:kSCNavBarImageTag];
12.     if (imageView == nil) 
13.     { 
14.         imageView = [[UIImageView alloc] initWithImage: 
15.                      [UIImage imageNamed:@"navbar1.png"]];
16.         [imageView setTag:kSCNavBarImageTag]; 
17.         [navBar insertSubview:imageView atIndex:0];
18.         [imageView release]; 
19.     } 
20. } 

 

更改颜色，可以使用tintColor属性