iOS开发笔记-11:去掉navigationbar 黑线

在AppDelegate里面配置app的时候加上

if ([UINavigationBar instancesRespondToSelector:@selector(setShadowImage:)])
    {
        [[UINavigationBar appearance] setShadowImage:[self createImageWithColor:[UIColor clearColor]]];
    }

//颜色转换图片
- (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;
}