iOS7 - Change UINavigationBar border color

Question

Is it possible to change the grey border-bottom color of the UINavigationBar in iOS7?

I already tried to remove to border, but this is not working:

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Answer 1

Picture 1

you can use Reveal to see the border color is the UIImageView's backgroundColor. so directly modifying the imageView's backgroundColor or hide it.

the code: i write in @interface QdtTabBarController : UITabBarController

Class backGroundClass = NSClassFromString(@"_UIBarBackground");
for (UIView *view in self.tabBar.subviews) {
    if ([view isKindOfClass:backGroundClass]) {
        for (UIView *view2 in view.subviews) {
            if ([view2 isKindOfClass:[UIImageView class]]) {
                dispatch_async(dispatch_get_main_queue(), ^{
                    view2.backgroundColor = [UIColor redColor];
                });
            };
        };
        break;
    }
}

Picture 2