ios - Switch from back camera to front camera while recording -


so have custom camera works. can record video , file etc. can choose camera use; front or back. however, when press record can switch between front camera , camera , still records file until hit stop recording. hope makes sense.

my code switching cameras:

@ibaction func changecamera(sender: anyobject) {      println("change camera")      self.recordbutton.enabled = false      dispatch_async(self.sessionqueue!, {          var currentvideodevice:avcapturedevice = self.videodeviceinput!.device         var currentposition: avcapturedeviceposition = currentvideodevice.position         var preferredposition: avcapturedeviceposition = avcapturedeviceposition.unspecified          switch currentposition{         case avcapturedeviceposition.front:             preferredposition = avcapturedeviceposition.back         case avcapturedeviceposition.back:             preferredposition = avcapturedeviceposition.front         case avcapturedeviceposition.unspecified:             preferredposition = avcapturedeviceposition.back          }            var device:avcapturedevice = viewcontroller.devicewithmediatype(avmediatypevideo, preferringposition: preferredposition)          var videodeviceinput: avcapturedeviceinput = avcapturedeviceinput(device: device, error: nil)          self.session!.beginconfiguration()          self.session!.removeinput(self.videodeviceinput)          if self.session!.canaddinput(videodeviceinput){              nsnotificationcenter.defaultcenter().removeobserver(self, name:avcapturedevicesubjectareadidchangenotification, object:currentvideodevice)              viewcontroller.setflashmode(avcaptureflashmode.auto, device: device)              nsnotificationcenter.defaultcenter().addobserver(self, selector: "subjectareadidchange:", name: avcapturedevicesubjectareadidchangenotification, object: device)              self.session!.addinput(videodeviceinput)             self.videodeviceinput = videodeviceinput          }else{             self.session!.addinput(self.videodeviceinput)         }          self.session!.commitconfiguration()            dispatch_async(dispatch_get_main_queue(), {             self.recordbutton.enabled = true             self.stoprecording.enabled = true         })      })  }


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