学步园

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:

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

例如, 在我的项目中, 添加如下代码:

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

实现的效果如下图: