How to check if an iOS camera support 4K capture

CaptureDeviceDiscovery.swift

/*
 * Does not require camera access permission

 * Usage:
  let tool = CaptureDeviceDiscovery()
            
  let front = tool.videoCaptureDevice(at: .front)?.supportsSessionPreset(AVCaptureSession.Preset.hd4K3840x2160) ?? false
  let back = tool.videoCaptureDevice(at: .back)?.supportsSessionPreset(AVCaptureSession.Preset.hd4K3840x2160) ?? false
  self.labelStatusFront.text = front ? "Supported" : "Not supported"
  self.labelStatusBack.text = back ? "Supported" : "Not supported"
 */
class CaptureDeviceDiscovery {
    @available(iOS 10.0, *)
    func availableDeviceTypes() -> [AVCaptureDevice.DeviceType] {
        var deviceTypes: [AVCaptureDevice.DeviceType] = [.builtInTelephotoCamera, .builtInWideAngleCamera]
        // 10.2
        if #available(iOS 10.2, *) {
            deviceTypes.append(.builtInDualCamera)
            if #available(iOS 11.1, *) {
                deviceTypes.append(.builtInTrueDepthCamera)
            }
        }
        return deviceTypes
    }
    
    func videoCaptureDevice(at position: AVCaptureDevice.Position) -> AVCaptureDevice? {
        var device: AVCaptureDevice? = nil
        if #available(iOS 10, *) {
            let deviceTypes = availableDeviceTypes()
            let session = AVCaptureDevice.DiscoverySession(deviceTypes: deviceTypes, mediaType: .video, position: position)
            device = session.devices.first
        } else {
            device = AVCaptureDevice.devices(for: AVMediaType.video).filter( { $0.position == position }).first
        }
        return device
    }
}

Thank you! Is it possible to use this code? I'll reference you.

Thank you! Is it possible to use this code? I'll reference you.

Sure. As much as you want