ios - 视频预览显示黑屏 - iOS

Question

我的应用程序正在从相机捕获视频，但在 iPhone 11 设备上，视频预览初始屏幕显示为黑色。视频在预览中播放良好，只有预览的第一个快照是黑色的。以下是我的代码：-

if (UIImagePickerController.isSourceTypeAvailable(.camera)) {
        if UIImagePickerController.availableCaptureModes(for: .rear) != nil {
            if type == .video {
                self.cameraPicker.sourceType = .camera
                self.cameraPicker.allowsEditing = false
                self.cameraPicker.delegate = self
                self.cameraPicker.mediaTypes =  [kUTTypeMovie as String]
                self.cameraPicker.cameraCaptureMode = (type == .video) ? .video : .photo
                present(self.cameraPicker, animated: true, completion: {})
            } 
}
}

提前致谢。