objective c - Check which camera is currently in use in iOS Application -


i'm writing app has custom made view taking photos camera, similar apple's avcam. in it, want make button disappear , re-appear flash icon every time camera switched. ie when using front camera, flash button shouldn't there , when using should!

my code @ moment is: 

  avcapturedeviceposition position = [[videoinput device] position];      if (position == avcapturedevicepositionback) {   self.flashbutton.hidden == yes; }

but comes error on videoinput , i'm not sure why... documentation direct me or ideas changes in code appreciated!

edit

just why come error of 'use of undeclared identifier' code:

avcapturedeviceposition position = [[videoinput device] position];

the below code might :

avcapturedeviceinput *newvideoinput; avcapturedeviceposition currentcameraposition = [[videoinput device] position];  if (currentcameraposition == avcapturedevicepositionback) {     currentcameraposition = avcapturedevicepositionfront; } else {     currentcameraposition = avcapturedevicepositionback; }  avcapturedevice *backfacingcamera = nil; nsarray *devices = [avcapturedevice deviceswithmediatype:avmediatypevideo]; (avcapturedevice *device in devices)  {     if ([device position] == currentcameraposition)     {         backfacingcamera = device;     } } newvideoinput = [[avcapturedeviceinput alloc] initwithdevice:backfacingcamera error:&error];

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