ios开发之修改NavigationBar的背景图片

一、写一个category

@implementation UINavigationBar(customImage)

-(void)drawRect:(CGRect)rect{
    UIImage *backgroundImage = [UIImage imageNamed:@"背景.png"];
    [backgroundImage drawInRect:CGRectMake(0, 0, 320, 44)];

}

@end

二、首先引入#import <QuartzCore/QuartzCore.h>，之后

self._navigationController.navigationBar.layer.contents=(id)[UIImage imageNamed:@"背景.png"].CGImage;

三、将有的navigationBar隐藏掉，自己写一个，当然返回的方法也得自己来写了

另参考
http://blog.csdn.net/iorchid/article/details/6717778
http://stackoverflow.com/questions/7760819/uinavigationbar-setbackgroundimage-forbarmetrics-not-working