How can I view the return value from Future

 Future<bool> res;
 res = cancelDialog();
 print("res..........: ${res}");
 

my cancel dialog:

Future<bool> cancelDialog(_formKey, context, cancelFn) async {
  var res = await showModalActionSheet(
      onWillPop: () async => false,
      context: context,
      actions: <SheetAction>[
        SheetAction(label: "Evet", key: "evet"),
        SheetAction(label: "Hayır", key: "hayir")
      ],
      title: "Tüm değişilikler geri alınacaktır.",
      message: "Devam etmek istediğinize emin misiniz?");
  if (res == "evet") {
    _formKey.currentState?.reset();
     cancelFn.call();
     //return true;
     return Future<bool>.value(true);

  } else {
   //retun false;
    return Future<bool>.value(false);
  }
}

output : res..........: Instance of 'Future'

The value I want to see in the res is true or false, how can I provide it?

Thank YOU!

CodePudding user response：

you have to await to get the aswer of any value for example

bool dialogvalue=await res;
 print(dailogvalue)

CodePudding user response：

You are working with a Future<T> object from an async API, which is actually an object that will resolve (in a future) to your T.

Because of that, you need to either:

bool result = await res;
print(result); // true or false

or

res.then((result) => print(result)); // true or false

CodePudding user response：

To get the value of Future you have to add await keyword before that as below:

 Future<bool> res;
 res = await cancelDialog();
 print("res..........: ${res}");

Check it out and do let me know if you face the problem.

CodePudding user response：

The Answer is you have to use await keyword, it make the cancelDialog() future to finish then it proceeds to print function.

Future<bool> res;
 res = await cancelDialog();
 print("res..........: ${res}");

Make sure you use async keyword to the function of the above code