ios - How to implement "pinch to zoom" in custom camera -


i have custom photo/video camera (think snapchat) pinch recognizer zoom in/out. here's what's going right based on code found online:

  • zooming in works properly
  • capturing image captures zoomed image

here's what's going wrong need with:

  • zoom out causes crash
  • although zooming in works, seems reset zoom if zoom in, stop touching screen, try zoom in again.
  • capturing video resets zoom

this code pinch gesture, should changed?

for input in self.capturesession.inputs {             // check input camera , not audio             if input.device == self.frontcameradevice || input.device == self.backcameradevice {                  if pinch.state == uigesturerecognizerstate.changed {                      let device: avcapturedevice = input.device                     let vzoomfactor = pinch.scale                     do{                         try device.lockforconfiguration()                         if vzoomfactor <= device.activeformat.videomaxzoomfactor {                             device.videozoomfactor = vzoomfactor                             device.unlockforconfiguration()                         }                     }catch _{                     }                 }              }         }

you have set videozoomfactor based on former value.

do {     try device.lockforconfiguration()     switch gesture.state {     case .began:         self.pivotpinchscale = device.videozoomfactor     case .changed:         var factor = self.pivotpinchscale * gesture.scale         factor = max(1, min(factor, device.activeformat.videomaxzoomfactor))         device.videozoomfactor = factor     default:         break     }     device.unlockforconfiguration() } catch {     // handle exception }

you should have saved former scale factor in order start zoom in/out current zoom state, self.pivotpinchscale in above example key. wish can hints following example.

https://github.com/dragoncherry/camerapreviewcontroller


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