live_camera_view.py 文件源码

def __init__(self,device=1, *args, **kwargs):
      ui.View.__init__(self,*args,**kwargs)
      self._session=ObjCClass('AVCaptureSession').alloc().init()
      self._session.setSessionPreset_('AVCaptureSessionPresetHigh');
      inputDevices=ObjCClass('AVCaptureDevice').devices()
      self._inputDevice=inputDevices[device]

      deviceInput=ObjCClass('AVCaptureDeviceInput').deviceInputWithDevice_error_(self._inputDevice, None);
      if self._session.canAddInput_(deviceInput):
         self._session.addInput_(deviceInput)
      self._previewLayer=ObjCClass('AVCaptureVideoPreviewLayer').alloc().initWithSession_(self._session)
      self._previewLayer.setVideoGravity_( 
         'AVLayerVideoGravityResizeAspectFill')
      rootLayer=ObjCInstance(self).layer()
      rootLayer.setMasksToBounds_(True)
      self._previewLayer.setFrame_(
         CGRect(CGPoint(-70, 0), CGSize(self.height,self.height)))
      rootLayer.insertSublayer_atIndex_(self._previewLayer,0)
      self._session.startRunning()