救命啊。UTS中 AVCaptureFileOutputRecordingDelegate一直implements不了

class MyAVCaptureFileOutputRecordingDelegate implements AVCaptureFileOutputRecordingDelegate {  
    constructor() {  
    }  

    fileOutput(output : AVCaptureFileOutput, @argumentLabel("didStartRecordingTo") fileURL : URL, @argumentLabel("from") connections : [AVCaptureConnection]) : void {  

    }  

    fileOutput(output : AVCaptureFileOutput, @argumentLabel("didFinishRecordingTo") outputFileURL : URL, @argumentLabel("from") connections : [AVCaptureConnection], @argumentLabel("error") error ?: Error) : void {  

    }  

}

13:02:40.367 error: type 'MyAVCaptureFileOutputRecordingDelegate' does not conform to protocol 'AVCaptureFileOutputRecordingDelegate'
13:02:40.367 at uni_modules/XF-cameraUTS/utssdk/app-ios/camera.uts:50:6
13:02:40.368 48 | ])
13:02:40.368 49 |
13:02:40.368 50 | class MyAVCaptureFileOutputRecordingDelegate implements AVCaptureFileOutputRecordingDelegate {
13:02:40.368 | ^
13:02:40.368 51 | constructor() {
13:02:40.368 52 | }