segmentedControlBottomBorder.swift

extension UISegmentedControl {
    
    func removeBorder(){
        
        self.tintColor = UIColor.clear
        self.backgroundColor = UIColor.clear
        self.setTitleTextAttributes( [NSAttributedString.Key.foregroundColor : UIColor.stavkrugDarkBlue], for: .selected)
        self.setTitleTextAttributes( [NSAttributedString.Key.foregroundColor : UIColor.gray], for: .normal)
        
    }
    
    func setupSegment() {
        self.removeBorder()
        let segmentUnderlineWidth: CGFloat = self.bounds.width
        let segmentUnderlineHeight: CGFloat = 2.0
        let segmentUnderlineXPosition = self.bounds.minX
        let segmentUnderLineYPosition = self.bounds.size.height - 1.0
        let segmentUnderlineFrame = CGRect(x: segmentUnderlineXPosition, y: segmentUnderLineYPosition, width: segmentUnderlineWidth, height: segmentUnderlineHeight)
        let segmentUnderline = UIView(frame: segmentUnderlineFrame)
        segmentUnderline.backgroundColor = UIColor.clear
        
        self.addSubview(segmentUnderline)
        self.addUnderlineForSelectedSegment()
        
    }
    func addUnderlineForSelectedSegment(){
        
        let underlineWidth: CGFloat = self.bounds.size.width / CGFloat(self.numberOfSegments)
        let underlineHeight: CGFloat = 2.0
        let underlineXPosition = CGFloat(selectedSegmentIndex * Int(underlineWidth))
        let underLineYPosition = self.bounds.size.height - 1.0
        let underlineFrame = CGRect(x: underlineXPosition, y: underLineYPosition, width: underlineWidth, height: underlineHeight)
        let underline = UIView(frame: underlineFrame)
        underline.backgroundColor = UIColor.stavkrugDarkBlue
        underline.tag = 1
        self.addSubview(underline)
    }
    
    func changeUnderlinePosition(){
        guard let underline = self.viewWithTag(1) else {return}
        let underlineFinalXPosition = (self.bounds.width / CGFloat(self.numberOfSegments)) * CGFloat(selectedSegmentIndex)
        underline.frame.origin.x = underlineFinalXPosition
        
    }
}