如何在Swift中获得前置摄像头？

这是我的一个项目的工作示例，用于获取前置摄像头。这是在Objective-C中实现的，但事实证明它是可行的，并且足够容易转换为快捷方式。

NSArray *videoDevices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];AVCaptureDevice *captureDevice = nil;for (AVCaptureDevice *device in videoDevices){    if (device.position == AVCaptureDevicePositionFront){        captureDevice = device;        break;    }}

在Swift 3.2+中：

if let videoDevices = AVCaptureDevice.devices(withMediaType: AVMediaTypeVideo) {    var captureDevice: AVCaptureDevice    for device in videoDevices {        if let device = device as? AVCaptureDevice { if device.position == AVCaptureDevicePosition.front {     captureDevice = device     break }        }    }}