ios - How to move a line created with UIBezierPath? -


i want move line. use touchesmoved it. line shifted relative location of finger 100 pixels. why happen?

func drawline() {    let line = cashapelayer()    let linepath = uibezierpath()    linepath.move(to: to: cgpoint(x: 100, y: 100)    linepath.addline(to: cgpoint(x: self.view.frame.width - 100, y: 100))    line.path = linepath.cgpath    line.strokecolor = uicolor.red.cgcolor    line.linewidth = 1    line.linejoin = kcalinejoinround    self.view.layer.addsublayer(line) } override func viewdidload()  {             super.viewdidload()     drawline() }  override func touchesmoved(_ touches: set<uitouch>, event: uievent?)  {     let touch = touches.first     guard let location = touch?.location(in: self.view) else     {         return     } line.frame.origin = cgpoint(x: location.x-line.frame.size.width/2, y: location.y-line.frame.size.height/2) }

this because not starting line drawing cgpoint.zero. change

linepath.move(to: to: cgpoint(x: 100, y: 100) linepath.addline(to: cgpoint(x: self.view.frame.width - 100, y: 100))

to

linepath.move(to: .zero) linepath.addline(to: cgpoint(x: 100, y: 0))

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