Gridview.builder 不通过 setState() 更新

Question

我正在从列表创建动态小部件，当我单击由列表创建的小部件时，我希望它更新其名称。我正在使用有状态小部件并且没有错误，当我单击小部件 suggestionList 更新自身但它不影响文本小部件时。

这是我的清单

List suggestionList = [
{'name':'Tomato','imageurl':'https://ayb.akinoncdn.com/products/2021/06/18/7025/46ead09c-f4cb- 
4b85-acd7-8ca1d8452864_size780x780_quality60_cropCenter.jpg'}];

这是我的 GridView

 GridView.builder(
          shrinkWrap: true,
          itemCount: suggestionList.length,
      gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
     crossAxisCount: 2,
  ),
     itemBuilder: (context,index){
     Map data = suggestionList[index];
     return GestureDetector(
     onTap: (){
     setState(() {
          suggestionList.clear();
          suggestionList = 
   
   
 [{'name':'Eggplant','imageurl':'https://ayb.akinoncdn.com/products/2021/06/18/7025/46ead09c- 
 f4cb-4b85-acd7-8ca1d8452864_size780x780_quality60_cropCenter.jpg'}];
        print(suggestionList);
        });
   },
child:Container(

  alignment: Alignment.topLeft,
  padding: const EdgeInsets.all(8),
  decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.circular(25),
          boxShadow: [
  BoxShadow(
    color: Colors.black.withOpacity(0.05),
    blurRadius: 2.0, // soften the shadow
    spreadRadius: 1.0, //extend the shadow
    offset: Offset(
      0, // Move to right 10  horizontally
      1.0, // Move to bottom 5 Vertically
    ),
  )
],
            


),
  child: Column(
      children: [
        Expanded(
          flex: 10,
          child: Container(
          
          decoration: BoxDecoration(
          
          borderRadius: BorderRadius.circular(25),
         
            
  image: DecorationImage(image: NetworkImage(data['imageurl']),
  fit: BoxFit.scaleDown)
),
          
        ),),
       
        Expanded(flex:1,
        child: Text(data['name'],style: TextStyle(
          fontWeight: FontWeight.w600
        ),),),
      ],
    ),
  
));}
),

Answer 1

你可以试试这个：

    setState(() {
      suggestionList.clear();
      suggestionList= List.from(suggestionList)
       ..add({'name':'Eggplant','imageurl':'https://ayb.akinoncdn.com/products/2021/06/18/7025/46ead09c- 
 f4cb-4b85-acd7-8ca1d8452864_size780x780_quality60_cropCenter.jpg'});
    });

Answer 2

如果有人需要的话，我把答案放在这里。我现在正在使用状态管理，它非常有用。

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget{
@override
Widget build(BuildContext context){
return MultiProvider(
  child: MaterialApp(
    title: 'Provider',
    home: NewMainPage(),
  ),
  providers: [
    ChangeNotifierProvider.value(value: PageState()),
  ],
);
}
}

 class PageState extends ChangeNotifier{
 var suggestionList = [

 {'name':'Domates','imageurl':'
       https://ayb.akinoncdn.com/products/2021/06/18/7025/46e
       ad09c-f4cb-4b85-acd7-8ca1d8452864_size780x780_quality60_cropCenter.jpg'},
{'name':'Biber','imageurl':'
       https://iasbh.tmgrup.com.tr/d852d6/1200/627/0/187/800/604? 
       u=https://isbh.tmgrup.com.tr/sbh/2020/05/14/biberin-faydalari-nelerdir- 
       yesil-biberin-cilde-faydalari-1589469175731.jpg'},
{'name':'Patlıcan','imageurl':'
     https://cdn.cimri.io/market/260x260/patlican-_210439.jpg'},
  ];
add(List a){
suggestionList = a.toList();
notifyListeners();
 }
}

 class NewMainPage extends StatelessWidget {

 @override
 Widget build(BuildContext context) {
 List suggestionList = Provider.of<PageState>(context).suggestionList;
 // TODO: implement build
 return Scaffold(
 appBar: AppBar(
   title: Text('Provider'),),
   body: GridView.builder(
          shrinkWrap: true,
 itemCount: Provider.of<PageState>(context).suggestionList.length,
 gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
 crossAxisCount: 2,
 ),
 itemBuilder: (context,index){
 Map data = Provider.of<PageState>(context).suggestionList[index];
 return GestureDetector(
onTap: (){
  
  Provider.of<PageState>(context,listen:false).add([{'name':'Eggplant','imageurl':'https://ayb.akinoncdn.com/products/2021/06/18/7025/46ead09c-f4cb-4b85-acd7-8ca1d8452864_size780x780_quality60_cropCenter.jpg'}].toList());
},
child:Container(

  alignment: Alignment.topLeft,
  padding: const EdgeInsets.all(8),
  decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.circular(25),
          boxShadow: [
  BoxShadow(
    color: Colors.black.withOpacity(0.05),
    blurRadius: 2.0, // soften the shadow
    spreadRadius: 1.0, //extend the shadow
    offset: Offset(
      0, // Move to right 10  horizontally
      1.0, // Move to bottom 5 Vertically
    ),
  )
],
            


),
  child: Column(
      children: [
        Expanded(
          flex: 10,
          child: Container(
          
          decoration: BoxDecoration(
          
          borderRadius: BorderRadius.circular(25),
         
            
  image: DecorationImage(image: NetworkImage(data['imageurl']),
  fit: BoxFit.scaleDown)
),
          
        ),),
       
        Expanded(flex:1,
        child: Text(data['name'],style: TextStyle(
          fontWeight: FontWeight.w600
        ),),),
      ],
    ),
  
 ));}
   ),

 );
 }


}

Gridview.builder 不通过 setState() 更新

Gridview.builder doesn't update by setState()

flutter

gridview

set

state

setstate