ios 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

myBar.tintColor = [UIColor greenColor];