ios - How to implement Pinch To Zoom in camera (Swift 3)? -


i want implement simple pinch zoom gesture in qr app.
seems simple, did researches found few possible answers problem:

avcapturedevice camera zoom
how implement "pinch zoom" in custom camera
pinch zoom camera
zooming while capturing video using avcapture in ios

unfortunately none of solve wanted, liked first 1 (in objective-c) , tried in swift 3.

i posted answer code came after tries, other easier/better/simpler solutions welcomed :)

i used pinch gesture recognizer storyboard, linked action:

@ibaction func pinchtozoom(_ sender: uipinchgesturerecognizer) {          guard let device = capturedevice else { return }          if sender.state == .changed {              let maxzoomfactor = device.activeformat.videomaxzoomfactor             let pinchvelocitydividerfactor: cgfloat = 5.0              {                  try device.lockforconfiguration()                 defer { device.unlockforconfiguration() }                  let desiredzoomfactor = device.videozoomfactor + atan2(sender.velocity, pinchvelocitydividerfactor)                 device.videozoomfactor = max(1.0, min(desiredzoomfactor, maxzoomfactor))              } catch {                 print(error)             }         }     }

note capturedevice optional object of class avcapturedevice.


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