Flutter ChangeNotifierProvider builder is deprecat

问题:

I have this code in my main.dart:

main() {
  runApp(
    MultiProvider(
      providers: [
        ChangeNotifierProvider(builder: (context) => Auth()), // /**problem here. builder displayed with strikethrough line**/
      ],
      child: App(),
    ),
  );
}

since about 2 days ago, my visual studio code showing this warning:

so I guess builder parameter on ChangeNotifierProvider is deprecated. I searched everywhere but can't find alternative to this builder parameter. So how to remove these warning? Below is my flutter version using flutter --version command on Windows 10

> flutter --version
Flutter 1.9.1+hotfix.6 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 68587a0916 (3 months ago) • 2019-09-13 19:46:58 -0700
Engine • revision b863200c37
Tools • Dart 2.5.0

For any help, thanks in advance

回答1:

Since provider version 3.2.0 "builder" is marked as deprecated in favor of "create".

More info can be found in the change log

So should do:

ChangeNotifierProvider(create: (context) => Auth())

回答2:

you can pass with create as builder.

    return Provider<MyProvider>(
        create: (context) => MyProvider(

        ),
        child: HomePage(),
    );

回答3:

you can use "create" instead of "builder"

main() {
 runApp(
   MultiProvider(
     providers: [
       ChangeNotifierProvider(create: (context) => Auth()), // /**problem here. 
builder displayed with strikethrough line**/
     ],
     child: App(),
   ),
 );

}

回答4:

Instead of builder parameter you can use create param with Product() or specific product at Index.

itemBuilder: (ctx, i) => ChangeNotifierProvider(
        create: (context) => products[i],
        child:  ProductItem(),
      ), 

Or can be use as Value version:

itemBuilder: (ctx, i) => ChangeNotifierProvider.value(
        value: products[i],
        child:  ProductItem(),
      ),