iphone编程 - 如何录制通话

import CallKit
import AVFoundation

class AppDelegate: UIResponder, UIApplicationDelegate, CXCallObserverDelegate {
    let callObserver = CXCallObserver()
    
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        callObserver.setDelegate(self, queue: nil)
        return true
    }
    
    func callObserver(_ callObserver: CXCallObserver, callChanged call: CXCall) {
        if call.hasConnected {
            // 通话已连接，开始录制
            startRecording()
        } else if call.hasEnded {
            // 通话已结束，停止录制
            stopRecording()
        }
    }
    
    func startRecording() {
        // 创建录音文件保存路径
        let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
        let audioFilename = documentsDirectory.appendingPathComponent("callRecording.wav")
        
        // 配置录音设置
        let settings = [
            AVFormatIDKey: Int(kAudioFormatLinearPCM),
            AVSampleRateKey: 44100,
            AVNumberOfChannelsKey: 2,
            AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
        ]
        
        // 创建AVAudioRecorder对象并开始录制
        do {
            let audioRecorder = try AVAudioRecorder(url: audioFilename, settings: settings)
            audioRecorder.record()
        } catch {
            // 处理录制失败的情况
        }
    }
    
    func stopRecording() {
        // 停止录制
        let audioSession = AVAudioSession.sharedInstance()
        do {
            try audioSession.setActive(false)
        } catch {
            // 处理停止录制失败的情况
        }
    }
}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    callObserver.setDelegate(self, queue: nil)
    return true
}

<key>NSMicrophoneUsageDescription</key>
<string>需要访问麦克风以录制通话</string>