iOS AVFoundation:获取AVCaptureDevice.Format的视频尺寸

import AVFoundation

func getVideoSize() -> CGSize? {
    let discoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInWideAngleCamera], mediaType: .video, position: .back)
    guard let device = discoverySession.devices.first else {
        return nil
    }
    
    do {
        let input = try AVCaptureDeviceInput(device: device)
        let output = AVCaptureVideoDataOutput()
        
        let session = AVCaptureSession()
        session.addInput(input)
        session.addOutput(output)
        
        let connection = output.connection(with: .video)
        let formatDescription = connection?.videoFormatDescription
        let dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription!)
        
        return CGSize(width: Int(dimensions.width), height: Int(dimensions.height))
    } catch {
        print("Failed to get video size: \(error)")
        return nil
    }
}

if let videoSize = getVideoSize() {
    print("Video size: \(videoSize.width) x \(videoSize.height)")
} else {
    print("Failed to get video size")
}