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

To build on @sash's Swift implementation you can make the border responsive to rotation/trait changes by using constraints:

extension UINavigationBar {
  func setBottomBorderColor(color: UIColor, height: CGFloat) {

    let bottomBorderView = UIView()
    bottomBorderView.backgroundColor = color
    bottomBorderView.translatesAutoresizingMaskIntoConstraints = false
    addSubview(bottomBorderView)

    // Add constraints to make the bar always stay at the bottom of the nav bar and change size with rotation/trait changes
    let horizontalConstraint = NSLayoutConstraint(item: bottomBorderView, attribute: NSLayoutAttribute.centerX, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: NSLayoutAttribute.centerX, multiplier: 1, constant: 0)
    let verticalConstraint = NSLayoutConstraint(item: bottomBorderView, attribute: NSLayoutAttribute.centerY, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: NSLayoutAttribute.bottom, multiplier: 1, constant: 0)
    let widthConstraint = NSLayoutConstraint(item: bottomBorderView, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: .width, multiplier: 1, constant: 0)
    let heightConstraint = NSLayoutConstraint(item: bottomBorderView, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1, constant: height)

    self.addConstraints([horizontalConstraint, verticalConstraint, widthConstraint, heightConstraint])
  }
}