- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:YES];
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"head_bar_pink_.png"] forBarMetrics:UIBarMetricsDefault];
[self.navigationController.navigationBar setShadowImage:[self createImageWithColor:[UIColor clearColor]]];
}
//用颜色值创建图片
- (UIImage *)createImageWithColor:(UIColor *)color{
CGRect rect = CGRectMake(0.0f,0.0f,1.0f,1.0f);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context =UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *theImage =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return theImage;
}