如何为UINavigationBar设置背景图片

在iPhone开发中, 有时候我们想给导航条添加背景图片, 实现多样化的导航条效果, 用其他方法往往无法达到理想的效果, 经过网上搜索及多次实验, 确定如下最佳实现方案:

为UINavigatonBar增加如下Category:

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1. @implementation UINavigationBar (CustomImage)  
2. - (void)drawRect:(CGRect)rect {  
3.     UIImage *image = [UIImage imageNamed: @"NavigationBar.png"];  
4.     [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];  
5. }  
6. @end  

@implementation UINavigationBar (CustomImage)- (void)drawRect:(CGRect)rect {UIImage *image = [UIImage imageNamed: @"NavigationBar.png"];[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];}@end

 

例如, 在我的项目中, 添加如下代码:

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1. /////////////////////////////////////////////////////////  
2. /* input: The image and a tag to later identify the view */  
3. @implementation UINavigationBar (CustomImage)  
4. - (void)drawRect:(CGRect)rect {  
5.     UIImage *image = [UIImage imageNamed: @"title_bg.png"];  
6.     [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];  
7. }  
8. @end  
9. /////////////////////////////////////////////////////////  
10. @implementation FriendsPageViewController  
11. // Implement viewDidLoad to do additional setup after loading the view, typically from a nib.  
12. - (void)viewDidLoad {     
13.     self.navigationBar.tintColor = [UIColor purpleColor];  
14.       
15.     [self initWithRootViewController:[[RegPageViewController alloc] init]];  
16.     [super viewDidLoad];  
17. }  
18. ......  

//////////////////////////////////////////////////////////* input: The image and a tag to later identify the view */@implementation UINavigationBar (CustomImage)- (void)drawRect:(CGRect)rect {UIImage *image = [UIImage imageNamed: @"title_bg.png"];[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];}@end/////////////////////////////////////////////////////////@implementation FriendsPageViewController// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.- (void)viewDidLoad {self.navigationBar.tintColor = [UIColor purpleColor];[self initWithRootViewController:[[RegPageViewController alloc] init]]; [super viewDidLoad];}......

 

实现的效果如下图: