removeFromSuperview does not work well

import UIKit

classViewController:UIViewController {
 varonVLine —onVerticalLine!
override func viewDidLoad(){
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from anib.
}

override funcdidReceiveMemoryWarning(){
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


override functouchesMoved(touches:Set<UITouch>, withEvent:UIEvent?) {
    onVLine = onVerticalLine (frame: CGRectZero)
    self.view.addSubview(onVLine)
    }

override functouchesEnded(touches:Set<UITouch>, withEvent:UIEvent?) {
    if(onVLine!=nil){
    self.onVLine.removeFromSuperview()
    }
    }

}



class onVerticalLine:UIView {
let_verticalLine: UIBezierPath=UIBezierPath()


override init (frame:CGRect) {
    super.init (frame:frame)
    print("online-initiated")
    _verticalLine.removeAllPoints()
    self.userInteractionEnabled=false;
    self.backgroundColor=UIColor (white:1, alpha:0)
    self.frame = CGRectMake(0,0, UISscreen.mainScreen().bound.width, UISscreen.mainScreen().bound.width)
    self.center= CGPointMake (UISscreen.mainScreen().bound.width/2, UISscreen.mainScreen().bound.height/2)
    print("vertical", self.frame)
    _verticalLine.lineWidth=1
    _verticalLine.moveToPoint(CGPointMake(frame.origin.x,0))
    _verticalLine.addLineToPoint(CGPointMake(frame.origin.x,self.frame.origin.y+frame.height))


}

required init?(coder adecoder:NSCoder) {
    super.init(coder:aDecoder)


}


override func drawRect (rect:CGRect) {

    print("onLinedrawRected")
    UIColor.blueColor().setStroke()
    _verticalLine.stroke()

    }
}

self.view.addSubview(onVLines)
self.onVLines.removeFromSuperView()