show method
Implementation
Future<bool?> show({Gravity gravity = Gravity.bottom, double offset = 0.0}) async {
bool? result = await Ads.instance.channelBanner.invokeMethod("showBannerAd", <String, dynamic>{
'id': id,
'offset': offset.toString(),
'gravity': describeEnum(gravity),
"adType": _adType
});
return result;
}