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

Here's the method for creating image with clear color:

+ (UIImage*)imageFromColor:(UIColor *)color withSize:(CGSize)sizeImage
{
    UIImage *resultImage = nil;

    UIGraphicsBeginImageContext(sizeImage);

    CGContextSetFillColorWithColor(UIGraphicsGetCurrentContext(), color.CGColor);
    CGContextFillRect(UIGraphicsGetCurrentContext(), CGRectMake(0.0f, 0.0f, sizeImage.width, sizeImage.height));
    resultImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return resultImage;
}

Here's it's usage for removing annoying bottom line:

navigationBar.shadowImage = [UIImage imageFromColor:[UIColor clearColor] withSize:CGSizeMake(1.0f, 1.0f)];