ARKit支持面部追踪，可以识别面部特征包括眼睛、嘴巴、眉毛、鼻子等部位，但不支持耳朵、颈部和手指的检测。如果想要实现这些检测，可以使用Vision框架和CoreML模型来实现。例如，使用Vision框架的人脸识别功能来检测耳朵和颈部，或者使用CoreML模型来识别手指和手势。以下是使用Vision框架检测耳朵和颈部的示例代码：

import UIKit
import ARKit
import Vision

class ViewController: UIViewController, ARSessionDelegate {

    var arSceneView: ARSCNView!
    var request: VNRequest!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        arSceneView = ARSCNView(frame: view.bounds)
        view.addSubview(arSceneView)
        
        let configuration = ARFaceTrackingConfiguration()

        arSceneView.session.delegate = self
        arSceneView.session.run(configuration)
        
        request = VNDetectFaceRectanglesRequest(completionHandler: handleFaceDetection)
    }
    
    func handleFaceDetection(request: VNRequest, error: Error?) {
        guard let results = request.results as? [VNFaceObservation], let result = results.first else {
            return
        }
        
        let boundingBox = result.boundingBox
        
        // Detect ears
        let earRequest = VNDetectHumanBodyLandmarksRequest(completionHandler: handleEarDetection)
        let earOptions = [VNImageOptionBoundingBox: boundingBox]
        try? VNImageRequestHandler(cvPixelBuffer: arSceneView.session.currentFrame!.capturedImage, options: earOptions).perform([earRequest])
        
        // Detect neck
        let neckRequest = VNDetectHumanBodyPoseRequest(completionHandler: handleNeckDetection)
        let neckOptions = [VNImageOptionBoundingBox: boundingBox]
        try? VNImageRequestHandler(cvPixelBuffer: ar