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

The only way I found to change color is:

override func viewDidLoad() {
    super.viewDidLoad()

    if let navigationController = self.navigationController {
        let navigationBar = navigationController.navigationBar
        let navigationSeparator = UIView(frame: CGRectMake(0, navigationBar.frame.size.height - 1, navigationBar.frame.size.width, 0.5))
        navigationSeparator.backgroundColor = UIColor.redColor() // Here your custom color
        navigationSeparator.opaque = true
        self.navigationController?.navigationBar.addSubview(navigationSeparator)
    }

}