def still_image_output
    @still_image_output ||= AVCaptureStillImageOutput.alloc.init.tap do |output|
      settings = { 'AVVideoCodecKey' => AVVideoCodecJPEG }
      output.setOutputSettings(settings)
    end
  end
def still_image_output
    @still_image_output ||= AVCaptureStillImageOutput.alloc.init.tap do |output|
      settings = { 'AVVideoCodecKey' => AVVideoCodecJPEG }
      output.setOutputSettings(settings)
    end
  end
iOS 4-9