Swift: 获取前置摄像头 - AVCaptureDevice.defaultDevice() 使用指南
[AVCaptureDevice\ defaultDeviceWithDeviceType:\ AVCaptureDeviceTypeBuiltInWideAngleCamera\ \n\t\t\t\t\t\t\t\t\t\t\t\t\tmediaType:\ AVMediaTypeVideo\ \n\t\t\t\t\t\t\t\t\t\t\t\t\tposition:\ AVCaptureDevicePositionFront];转swift内容：AVCaptureDevice.defaultDevice(withDeviceType: .builtInWideAngleCamera, mediaType: AVMediaType.video, position: .front)
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