promptUpdate method Null safety

Future<void> promptUpdate(BuildContext context, {String title = 'Update Available', String message = ''' There is an updated version available on the App Store. Would you like to upgrade?''', String buttonUpgradeText = 'Upgrade', String buttonCancelText = 'Cancel', bool forceUpgrade = false})

This method shows an customizable AlertDialog if an update is available.

Implementation

Future<void> promptUpdate(BuildContext context,
    {String title = 'Update Available',
    String message = '''
There is an updated version available on the App Store. Would you like to upgrade?''',
    String buttonUpgradeText = 'Upgrade',
    String buttonCancelText = 'Cancel',
    bool forceUpgrade = false}) async {
  return showDialog<void>(
    context: context,
    barrierDismissible: false,
    builder: (context) {
      return FutureBuilder<bool>(
          future: updateIsAvailable(),
          builder: (context, snapshot) {
            if (snapshot.hasData) {
              final buttons = <Widget>[];

              if (!forceUpgrade) {
                buttons.add(TextButton(
                  child: Text(buttonCancelText),
                  onPressed: () {
                    Navigator.of(context).pop();
                  },
                ));
              }

              buttons.add(TextButton(
                child: Text(buttonUpgradeText),
                onPressed: () async {
                  final url = _response.url;

                  if (url != '' && await canLaunch(url)) {
                    await launch(url, forceSafariVC: false);
                  }

                  if (!forceUpgrade) {
                    Navigator.of(context).pop();
                  }
                },
              ));

              return AlertDialog(
                title: Text(title),
                content: Text(message),
                actions: buttons,
              );
            }

            return Container();
          });
    },
  );
}