Default values of an optional parameter must be constant flutter/Dart

Sore Sardine answered on June 10, 2022 Popularity 9/10 Helpfulness 2/10

answer Default values of an optional parameter must be constant flutter/Dart

Default values of an optional parameter must be constant flutter/Dart

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// *** Defined

import 'package:flutter/material.dart';

class TitleWidget extends StatelessWidget {
  final String title;
  final TextStyle? textStyle;

  const TitleWidget({
    Key? key,
    required this.title,
    this.textStyle,
  }) : super(key: key);

  @override
  Widget build(BuildContext context){
    return Text(  
      title,
      style: textStyle ?? Theme.of(context).textTheme.headline1!.copyWith(color: Colors.red),  // $$$$$ Set default value for parameter
    );
  }
}


// *** Usage

TitleWidget(
  title: 'Man',		// *** Have default value of TextStyle() parameter
  // textStyle: TextStyle(color: Colors.blue, fontSize: 18),	// *** You can custom style of Text() or use default value
),

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Contributed on Jun 10 2022

Sore Sardine

0 Answers Avg Quality 2/10

Default values of an optional parameter must be constant flutter/Dart

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