showing CircularProgressIndicator until the function end | flutter

I want to show CircularProgressIndicator until the function end, So I use this method,

• set bool isLoading = false;

• and this is the function,

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  verifyPhoneNumber(String input) async {
    setState(() {
      isLoading = true;
    });
    await AuthMethods().phoneSign(context, input);
    setState(() {
      isLoading = false;
    });}
  

• For this screen

                Scaffold(
                        body:  
                        isLoading
                            ? Center(
                                child: CircularProgressIndicator(color: darkblueColor),
                              )
                            : Column(
                                children: [ 
                                 IntlPhoneField(
                                      onChanged: (phone) {
                                        setState(() {
                                          fullNumber = phone.completeNumber;
                                        });
                                      },
                                    ),
                                 CustomButton(
                                      onTap: () {
                                            verifyPhoneNumber(fullNumber);
                                      },
                                      text: "Next",
                                      height: 50,
                                    ),],),)
  

This is not working!. Can futureBuilderapply for this & If it’s yes, How?

this function work for firebase phoneAuth, There is phoneSign inside AuthMethods class.

>Solution :

For question snippet , you need to await for verifyPhoneNumber

Future<void> verifyPhoneNumber(String input) async {
  setState(() {
    isLoading = true;
  });
  await AuthMethods().phoneSign(context, input);
  setState(() {
    isLoading = false;
  });}

Make the async method

CustomButton(
   onTap: ()async {
         await verifyPhoneNumber(fullNumber); // you need to await for future