Question

在我的项目中，我有页面产品列表，当它来自产品详细信息和任何其他页面时，我想让它保持活动状态，因为我正在使用 AutomaticKeepAliveClientMixin，我不想保持状态，下面是我的代码：

//This class use for Global variables
class GlobalVars{
  static bool keepProductListState = true;
}

//ProductList Class
class ProductListScreen extends StatefulWidget{
  ProductListScreen();

  @override
  ProductListState createState() => ProductListState();
}

//ProductList Class state 
class ProductListState extends State<ProductListScreen> with AutomaticKeepAliveClientMixin{
 bool shouldKeepAlive = true;


@override
Widget build(BuildContext context) {
  return Scaffold();
}

 @override
  void initState() {
  if(!GlobalVars.keepProductListState){
    shouldKeepAlive = false;
    updateKeepAlive();
  }

 super.initState();
}

 @override
 bool get wantKeepAlive => shouldKeepAlive;
}

 //i want keep state when open page from this page
 class ProductDetail extends StatefulWidget{
  ProductDetail();

  @override
 ProductDetailState createState() => ProductDetailState();
}

class ProductDetailState extends State<ProductDetail>{
 @override
 Widget build(BuildContext context) {
 return Scaffold( );
}

@override
void initState() {
 GlobalVars.keepProductListState = true;
 super.initState();
 }
}


//when product list open from main page i don't want it to be keep its state
 class Main extends StatefulWidget{
  @override
  MainState createState() => MainState();
}

class MainState extends State<Main >{
 @override
 Widget build(BuildContext context) {
  return Scaffold( );
}

@override
void initState() {
  GlobalVars.keepProductListState = false;
 super.initState();
 }
}

但它不起作用产品列表保持其状态， 我用tabcontroller来切换页面，我不知道我的代码有什么问题

如何在颤振中更新 wantKeepAlive 值

0 个答案: