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

I wrote an extension based on the other answers for easier usage in Swift:

extension UINavigationBar {

    func setBottomBorderColor(color: UIColor) {

        let navigationSeparator = UIView(frame: CGRectMake(0, self.frame.size.height - 0.5, self.frame.size.width, 0.5))
        navigationSeparator.backgroundColor = color
        navigationSeparator.opaque = true
        navigationSeparator.tag = 123
        if let oldView = self.viewWithTag(123) {
            oldView.removeFromSuperview()
        }
        self.addSubview(navigationSeparator)

    }
}

You can use this extension with calling the method in a context like that:

self.navigationController?.navigationBar.setBottomBorderColor(UIColor.whiteColor())

I found that pretty useful as I had to deal with that colored-border-problem.