Adding lines using CGRect - ios

Question

I can draw two perpendicular lines using UIView. I make y in vertical line 0, but if I change y I will not get perpendicular lines. How can I improve code?
var scanlineRect = CGRect.zero
var scanlineStartY: CGFloat = 30
var scanlineStopY: CGFloat = 0
var topBottomMargin: CGFloat = 30
var scanLine: UIView = UIView()
var scanlineRect2 = CGRect.zero
var scanlineStartY2: CGFloat = 100
var scanlineStopY2: CGFloat = 0
var topBottomMargin2: CGFloat = 30
var scanLine2: UIView = UIView()
func drawLine(Rect: CGRect) {
if Rect == scanlineRect
{
self.view.addSubview(scanLine)
scanLine.backgroundColor = UIColor.gray
scanlineRect = CGRect(x: 15, y: self.view.frame.height/2, width: self.view.frame.width - 30, height: 5)
scanLine.frame = scanlineRect
scanLine.center = CGPoint(x: scanLine.center.x, y: self.view.frame.height/2)
scanLine.isHidden = false
}
else if Rect == scanlineRect2{
self.view.addSubview(scanLine2)
scanLine2.backgroundColor = UIColor.black
scanlineRect2 = CGRect(x: 350, y: 0, width: 5, height: self.view.frame.height/2)
scanLine2.frame = scanlineRect2
scanLine2.center = CGPoint(x: 350, y: scanLine2.center.y)
scanLine2.isHidden = false
}
}
override func viewDidLoad() {
super.viewDidLoad()
drawLine(Rect: scanlineRect)
drawLine(Rect: scanlineRect2)
}
When y of vertical line equals 0
When y of vertical line is NOT equals 0