KaryawanDelete.dart

//fungsi save 
  void _deleteKaryawan(KaryawanModel model){
    final db = new DbLite(); 
    PopupHelper().alertDialogCuprtino(context, "Mohon tunggu...");
    Future.delayed( Duration(seconds: 3), (){
      db.deleteKaryawan(model.id).then((value){ //hapus data yg ada di database
        if(value > 0){
          setState(() {
            modelList.remove(model); //hapus data yg ada di list
          });
          Navigator.of(context, rootNavigator: true).pop();
          showDialog(
            context: context,
            barrierDismissible: false,
            builder: (BuildContext context) {
              return new WillPopScope(
                  onWillPop: () async => false,
                  child: new CupertinoAlertDialog(
                  title: new Text("Yeay, data berhasil dihapus", style: TextStyle(fontSize: 12), ),
                  actions: <Widget>[
                    new FlatButton(
                      onPressed: (){
                        Navigator.of(context, rootNavigator: true).pop();
                      },
                      child: new Text("Ok"),
                    )
                  ],
                ),
              );
            }
          );
        }else{
          Navigator.of(context, rootNavigator: true).pop();
          PopupHelper().alertDialogCuprtinoMsg(context, "Oops, terjadi kesalahan!");
        }
      });
    });
  }