Question 77292 in Flutter Question posted in
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onPressed ElevatedButton call automatically in Flutter

setState() or markNeedsBuild() called during build

Initially I want to know why onPress call automatically while rendering. After getting above issue I tried solving it in a number of ways like

WidgetsBinding.instance.addPostFrameCallback and Future.delayed . Code

class ShadowBtn {
  static Widget drawBtn(double width, double height, String text, myFunc) {
    return Container(
      width: width,
      height: height,
      child: ElevatedButton(
        ///onPressed: () => myFunc,
        onPressed: () {
          myFunc();
        },
        child: Text(text),
        ),
      ),
    );
  }
}

Some solutions said to update onPress like
onPressed: () => myFunc

I simply call it like

ShadowBtn.drawBtn(321.w, 61.h, "SEND OTP", openScreen(context))

Where openScreen

openScreen(context) {
  Future.delayed(Duration.zero, () async {
    Navigator.of(context)
        .pushNamedAndRemoveUntil('/dashboard', (Route<dynamic> route) => false);
  });

  // WidgetsBinding.instance.addPostFrameCallback((_) {
  //   Navigator.of(context).pushNamedAndRemoveUntil(
  //       '/dashboard', (Route<dynamic> route) => false);
  // });
}

After trying all the solution. I didn’t find any proper way to handle it.

Tags:

2

Answers


  1. 0

    openScreen function is called when passed as a parameter.

    ShadowBtn.drawBtn(321.w, 61.h, "SEND OTP", openScreen(context))

    Something like this should work:

    ShadowBtn.drawBtn(321.w, 61.h, "SEND OTP", () => openScreen(context));

class ShadowBtn {
  static Widget drawBtn(double width, double height, String text, void Function() myFunc) {
...
        onPressed: () {
          myFunc();
        },
...
  }
}
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  2. 0

    While passing the parameter you are actually not passing , instead making a function call, but function definition needs to be passed in the parameter.

    so try using (){function()}, so now the definition is passed, and function is not called.

    Change

    ShadowBtn.drawBtn(321.w, 61.h, "SEND OTP", openScreen(context))

    to

    ShadowBtn.drawBtn(321.w, 61.h, "SEND OTP", (){openScreen(context)})
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