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
}
}
}
}
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