import UIKit

enum line_position {
	case line_position_top
	case line_position_bottom
}

extension UIView {
	func addLine(position: line_position, color: UIColor, width: Double) {
		let lineView = UIView()
		lineView.backgroundColor = color
		lineView.translatesAutoresizingMaskIntoConstraints = false // This is important!
		self.addSubview(lineView)

		let metrics = ["width": NSNumber(value: width)]
		let views = ["lineView": lineView]
		self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[lineView]|", options: NSLayoutConstraint.FormatOptions(rawValue: 0), metrics: metrics, views: views))

		switch position {

		case .line_position_top:
			self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[lineView(width)]", options: NSLayoutConstraint.FormatOptions(rawValue: 0), metrics: metrics, views: views))
			break
		case .line_position_bottom:
			self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:[lineView(width)]|", options: NSLayoutConstraint.FormatOptions(rawValue: 0), metrics: metrics, views: views))
			break
		}
	}

	func animate(type: CATransitionType, subtype: CATransitionSubtype, duration: CFTimeInterval) {
		let transition = CATransition()
		transition.type = type
		transition.subtype = subtype
		transition.duration = duration
		layer.add(transition, forKey: "CustomAnimation117")
	}
}