ios7 uinavigationbar下面的黑线

默认UINavigationbar样式

准备用于替换的背景

 

替换后的效果

 if ([self.navigationController.navigationBar respondsToSelector:@selector( setBackgroundImage:forBarMetrics:)]){

     [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"top_bg"] forBarMetrics:UIBarMetricsDefault];

}

具体方法如下：

 if ([self.navigationController.navigationBar respondsToSelector:@selector( setBackgroundImage:forBarMetrics:)]){

        NSArray *list=self.navigationController.navigationBar.subviews;

        for (id obj in list) {

            if ([obj isKindOfClass:[UIImageView class]]) {

                UIImageView *imageView=(UIImageView *)obj;

                imageView.hidden=YES;

            }

        }

        UIImageView *imageView=[[UIImageView alloc] initWithFrame:CGRectMake(0, -20, 420, 64)];

        imageView.image=[UIImage imageNamed:@"top_bg"];

        [self.navigationController.navigationBar addSubview:imageView];

        [self.navigationController.navigationBar sendSubviewToBack:imageView];      

    }

  

最终效果：

   

参考文章：http://stackoverflow.com/questions/19037464/how-to-remove-uinavigationbar-and-uisearchbar-hairline

http://zhangmingwei.iteye.com/blog/2020543

http://www.cocoachina.com/ask/questions/show/107489

http://96888869.blog.163.com/blog/static/13176318220140815932695/