如何用`AVFoundation检测相机存在？ [英] How to detect camera existence with `AVFoundation`?

问题描述

现在iOS设备有0〜2个摄像头。如何检测它们？

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

推荐答案

您可以遍历视频设备...

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
    }
}

当然，你也可以使用谓词更快一些，为了你的工作;）....（建议：使用filteredArrayUsingPredicate：方法在devicesWithMediaType：）

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:)

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