尝试将IconButton包含在StatefulWidget中，并在StatefulWidget中记录广告是否已显示，然后导航到实际操作，如下所示：您的职能：

void showPopUpButton(BuildContext context) {
  showDialog(
    context: context,
    builder: (context) => Dialog(
      backgroundColor: Colors.transparent,
      child: DialogButtonWidget(),
    ),
  );
}

对话框按钮小部件：

class DialogButtonWidget extends StatefulWidget {
  const DialogButtonWidget({Key? key}) : super(key: key);

  @override
  State<DialogButtonWidget> createState() => _DialogButtonWidgetState();
}

class _DialogButtonWidgetState extends State<DialogButtonWidget> {
  bool _interstitialAdDisplayed = false;

  @override
  Widget build(BuildContext context) {
    return IconButton(
      icon: Image.asset('lib/images/last.png'),
      iconSize: 260,
      onPressed: () async {
        if (!_interstitialAdDisplayed) {
          _showInterstitialAd();
          setState(() {
            _interstitialAdDisplayed = true;
          });
        } else {
          initRandomImage();
          Navigator.pop(context);
          final player = AudioPlayer();
          await player.play(AssetSource('Sound1.wav'), volume: 1.0);
        }
      },
    );
  }
}