How to detect camera existence with `AVFoundation`?

问题

Now iOS devices has 0~2 cameras. How to detect them?

回答1:

You iterate through the video devices...

NSArray *videoDevices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
AVCaptureDevice *captureDevice = nil;

for (AVCaptureDevice *device in videoDevices) {
    if (device.position == AVCaptureDevicePositionFront) {
        //FRONT-FACING CAMERA EXISTS
    }
}

Of course you could also do this a bit quicker with a predicate, but i'll leave that for you to work out ;).... (HINT: use the filteredArrayUsingPredicate: method on the devicesWithMediaType:)

来源：https://stackoverflow.com/questions/5350079/how-to-detect-camera-existence-with-avfoundation