ios - How to move line? -


how move horizontal line in vertical direction? can draw straight horizontal line , need move using long press. how can that?

override func touchesbegan(_ touches: set<uitouch>, event: uievent?) {     if let touch = touches.first      {         let currentpoint = touch.location(in: self.view)         drawline(frompoint: currentpoint, topoint: currentpoint)     } } func drawline(frompoint: cgpoint, topoint: cgpoint) {     uigraphicsbeginimagecontext(self.view.frame.size)     imageview.image?.draw(in: cgrect(x: 0, y: 0, width: self.view.frame.width, height: self.view.frame.height))     let context = uigraphicsgetcurrentcontext()     let linewidth : cgfloat = 5     context?.move(to: cgpoint(x: frompoint.x, y: frompoint.y))     context?.addline(to: cgpoint(x: frompoint.x + 200, y: frompoint.y))     context?.setblendmode(cgblendmode.normal)     context?.setlinecap(cglinecap.round)     context?.setlinewidth(linewidth)     context?.setstrokecolor(uicolor(red: 0, green: 0, blue: 0, alpha: 1.0).cgcolor)     context?.strokepath()     imageview.image = uigraphicsgetimagefromcurrentimagecontext()     uigraphicsendimagecontext() }

you can draw horizontal line using uiview , can move in vertical direction using uiview.animate method providing required options.

in viewcontroller define following variables:

var scanlinerect = cgrect.zero var scanlinestarty: cgfloat = 0 var scanlinestopy: cgfloat = 0 var topbottommargin: cgfloat = 30 var scanline: uiview = uiview()

call drawline method inside viewdidload method , call movevertically method on touch event:

func drawline() {         self.addsubview(scanline)         scanline.backgroundcolor = uicolor(red: 0.4, green: 0.8, blue: 0.4, alpha: 1.0) // green color         scanlinerect = cgrect(x: 0, y: 0, width: self.frame.width, height: 2)         scanlinestarty = topbottommargin         scanlinestopy = self.frame.size.height - topbottommargin     }  func movevertically() {         scanline.frame  = scanlinerect         scanline.center = cgpoint(x: scanline.center.x, y: scanlinestarty)         scanline.ishidden = false         weak var weakself = scanline         uiview.animate(withduration: 1.0, delay: 0.0, options: [.repeat, .autoreverse, .beginfromcurrentstate], animations: {() -> void in             weakself!.center = cgpoint(x: weakself!.center.x, y: scanlinestopy)             }, completion: nil)     }

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