createInterstitialAd method
Create an Interstitial ads with slotId
Implementation
Future<InterstitialAd> createInterstitialAd(int slotId) async {
final uid = await _channel.invokeMethod<String>(
_methodCreateInterstitialAd,
{'slotId': slotId},
);
if (uid == null) {
throw FlutterError('Can not create Interstitial ad');
} else {
return InterstitialAd(this, uid);
}
}