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

Based on the answer from @sash I made an extension in Swift using Autolayout, explained right here.

In essence, the other solutions have the following pitfalls:

• Cannot add dropshadow if using the UIImage solution
• The subview added doesn't resize upon rotation of the view

extension UINavigationBar {

  func setBottomBorderColor(color: UIColor, height: CGFloat) -> UIView {

    let bottomBorderView = UIView(frame: CGRectZero)
    bottomBorderView.translatesAutoresizingMaskIntoConstraints = false
    bottomBorderView.backgroundColor = color

    self.addSubview(bottomBorderView)

    let views = ["border": bottomBorderView]
    self.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[border]|", options: [], metrics: nil, views: views))
    self.addConstraint(NSLayoutConstraint(item: bottomBorderView, attribute: .Height, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1.0, constant: height))
    self.addConstraint(NSLayoutConstraint(item: bottomBorderView, attribute: .Bottom, relatedBy: .Equal, toItem: self, attribute: .Bottom, multiplier: 1.0, constant: height))    

    return bottomBorderView
  }
}

This let you still add a drop shadow if you need to, and this handles rotation nicely !