更新AlertDialogue中显示的RadioListTile列表中的选择时出现问题

Question

我在几周内试图解决问题，但仍然无法解决，请帮帮我当用户按下添加到购物车时，它会显示一个带有RadioListTile列表的AlertDialogue，我没有做出任何选择，我再次按下它，它会给我最后一个选择，我在它上按下

我称之为图标按钮：AddProductToCartButton(产品(；

class AddProductToCartButton extends StatefulWidget {
final ProductModel product ;
AddProductToCartButton(this.product);
@override
_AddProductToCartButtonState createState() => _AddProductToCartButtonState();
}
class _AddProductToCartButtonState extends State<AddProductToCartButton> {
ProductSCIQPModel selectedSize = new ProductSCIQPModel();
String selectedTextSize;
bool addToCartFlag = false;
List<ProductSCIQPModel>_tempSizeDetailsList = [];
var _widgets =  List<Widget>();

@override
void initState() {
_tempSizeDetailsList = widget.product.size_color_price;
}
Future _addProductDetailsToCart() async{
addToCartFlag = true;
CartProvider cartProvider = Provider.of<CartProvider>(
context, listen: false);
CartProductModel _tempCartProductModel;
_tempCartProductModel = new CartProductModel();
_tempCartProductModel.productid = widget.product.id;
_tempCartProductModel.name = widget.product.name;
_tempCartProductModel.namear = widget.product.namear;
_tempCartProductModel.price = selectedSize.price ;
_tempCartProductModel.quantity = 1;
_tempCartProductModel.productSize = selectedSize.product_size;
_tempCartProductModel.image = widget.product.images[0];
cartProvider.addProductToCart(_tempCartProductModel);
await addProductToCart(_tempCartProductModel);
}
List<Widget> createRadioListSizes() {
_widgets.clear();
_tempSizeDetailsList.where((element) => element.available != false).forEach((ProductSCIQPModel element) {
_widgets.add(
RadioListTile(
value: element,
groupValue: selectedSize,
activeColor: Colors.blue,
title: Row(
children: [
Text(element.product_size != null ?
' ' + element.product_size
: 'no size'),
Text('  -  '),
Text(element.price.toString()),
],
),
onChanged: (ProductSCIQPModel value){
setState(() {
selectedSize = value;
});
print('selected : ' + selectedSize.product_size);
},
)
);});
return _widgets;
}
Future<String> SelectSizeDialogue(BuildContext context){
return showDialog(context: context, builder: (context){
return AlertDialog(
title: Text(AppLocalizations.of(context).translate('SELECTSIZE')),
content:
Column(
children: createRadioListSizes(),//_widgets ,
),
actions: [
MaterialButton(
elevation: 5.0,
child: Text('Add to cart'),
onPressed: ()  {
Navigator.of(context).pop();
_addProductDetailsToCart();
}),
MaterialButton(
elevation: 5.0,
child: Text('Cancel'),
onPressed: (){
addToCartFlag= false;
Navigator.of(context).pop();
},
)
],
);
});
}
@override
Widget build(BuildContext context) {
return IconButton(
icon:
Icon(Icons.add_shopping_cart, color: Colors.black54,),
onPressed: () async {
if (widget.product.size_color_price.length > 1){
await SelectSizeDialogue(context);
}else {
selectedSize.product_size = widget.product.size_color_price[0].product_size;
selectedSize.price = widget.product.size_color_price[0].price;
await _addProductDetailsToCart();
}
if(addToCartFlag) {
Scaffold.of(context).showSnackBar(SnackBar(
content: Text(widget.product.name + ' size : ' + selectedSize.product_size.toString() +
" added to cart"),
backgroundColor: Colors.green,
duration: Duration(seconds: 2)));
}
}
);
}
}

Answer 1

Alert Dialog是StateLess Widget，因此它不会更新ui。。。我建议用StatefullBuilder包装警报对话框，它将解决您的问题。