在iOS设备上同时使用前置和后置(主要和次要)摄像头 [英]Use front and back (primary and secondary) camera simultaneously on iOS device
如何使用 AVCaptureDeviceDiscoverySession 获取前置摄像头、后置摄像头和音频 [英]How to get front camera, back camera and audio with AVCaptureDeviceDiscoverySession