每次点击购物车再返回商品时都会产生错误，浏览量是重复的，点击返回时就会出现重复的页面我不知道为什么每次浏览再返回前一个页面时都会出现重复的页面，在这里我留下了代码的
Widget build(BuildContext context) {
return SizedBox(
width: 60,
height: 60,
child: RaisedButton(
padding: EdgeInsets.all(0),
color: Theme.of(context).accentColor,
shape: StadiumBorder(),
onPressed: () {
if (currentUser.value.apiToken != null) {
Navigator.of(context)
.pushNamed('/Cart', arguments: RouteArgument(param: '/Product', id: widget.product.id));
} else {
Navigator.of(context).pushNamed('/Login');
}
},
child: Stack(
alignment: AlignmentDirectional.bottomEnd,
children: <Widget>[
Icon(
Icons.shopping_cart,
color: this.widget.iconColor,
size: 28,
),
Container(
child: Text(
_con.cartCount.toString(),
textAlign: TextAlign.center,
style: Theme.of(context).textTheme.caption.merge(
TextStyle(color: Theme.of(context).primaryColor, fontSize: 10),
),
),
padding: EdgeInsets.all(0),
decoration:
BoxDecoration(color: this.widget.labelColor, borderRadius: BorderRadius.all(Radius.circular(10))),
constraints: BoxConstraints(minWidth: 15, maxWidth: 15, minHeight: 15, maxHeight: 15),
),
],
),
),
);
}}
购物车代码.
void initState() {
_con.listenForCarts();
_isButtonDisabled = false;
super.initState();
}
Widget build(BuildContext context) {
return WillPopScope(
onWillPop: () async => false,
child: Scaffold(
key: _con.scaffoldKey,
appBar: AppBar(
automaticallyImplyLeading: false,
leading: IconButton(
onPressed: () {
if (widget.routeArgument.param == '/Product') {
Navigator.of(context).pushReplacementNamed('/Product', arguments: RouteArgument(id: widget.routeArgument.id));
} else {
Navigator.of(context).pushReplacementNamed('/Pages', arguments: 2);
}
},
icon: Icon(Icons.arrow_back),
color: Theme.of(context).hintColor,
),
backgroundColor: Colors.transparent,
elevation: 0,
centerTitle: true,
title: Text(
S.of(context).cart,
style: Theme.of(context).textTheme.headline6.merge(TextStyle(letterSpacing: 1.3)),
),
),
body: RefreshIndicator(
onRefresh: _con.refreshCarts,
child: _con.carts.isEmpty
? EmptyCartWidget()
: Stack(
fit: StackFit.expand,
children: <Widget>[
Container(
margin: EdgeInsets.only(bottom: 150),
padding: EdgeInsets.only(bottom: 15),
child: SingleChildScrollView(
padding: EdgeInsets.symmetric(vertical: 10),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.start,
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Padding(
padding: const EdgeInsets.only(left: 20, right: 10),
child: ListTile(
contentPadding: EdgeInsets.symmetric(vertical: 0),
leading: Icon(
Icons.shopping_cart,
color: Theme.of(context).hintColor,
),
title: Text(
S.of(context).shopping_cart,
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: Theme.of(context).textTheme.headline4,
),
subtitle: Text(
S.of(context).verify_your_quantity_and_click_checkout,
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: Theme.of(context).textTheme.caption,
),
),
),
ListView.separated(
padding: EdgeInsets.symmetric(vertical: 15),
scrollDirection: Axis.vertical,
shrinkWrap: true,
primary: false,
itemCount: _con.carts.length,
separatorBuilder: (context, index) {
return SizedBox(height: 15);
},
itemBuilder: (context, index) {
return CartItemWidget(
cart: _con.carts.elementAt(index),
heroTag: 'cart',
increment: () {
_con.incrementQuantity(_con.carts.elementAt(index));
},
decrement: () {
_con.decrementQuantity(_con.carts.elementAt(index));
},
onDismissed: () {
_con.removeFromCart(_con.carts.elementAt(index));
},
);
},
),
],
),
),
),
Positioned(
bottom: 0,
child: Container(
height: 185,
padding: EdgeInsets.symmetric(horizontal: 20, vertical: 15),
decoration: BoxDecoration(
color: Theme.of(context).primaryColor,
borderRadius: BorderRadius.only(topRight: Radius.circular(20), topLeft: Radius.circular(20)),
boxShadow: [BoxShadow(color: Theme.of(context).focusColor.withOpacity(0.15), offset: Offset(0, -2), blurRadius: 5.0)]),
child: SizedBox(
width: MediaQuery.of(context).size.width - 40,
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Row(
children: <Widget>[
Expanded(
child: Text(
S.of(context).subtotal,
style: Theme.of(context).textTheme.bodyText1,
),
),
Helper.getPrice(_con.subTotal, context, style: Theme.of(context).textTheme.subtitle1)
],
),
SizedBox(height: 5),
Row(
children: <Widget>[
Expanded(
child: Text(
S.of(context).delivery_fee,
style: Theme.of(context).textTheme.bodyText1,
),
),
Helper.getPrice(_con.carts[0].product.market.deliveryFee, context, style: Theme.of(context).textTheme.subtitle1)
],
),
Row(
children: <Widget>[
Expanded(
child: Text(
'${S.of(context).tax} (${_con.carts[0].product.market.defaultTax}%)',
style: Theme.of(context).textTheme.bodyText1,
),
),
Helper.getPrice(_con.taxAmount, context, style: Theme.of(context).textTheme.subtitle1)
],
),
SizedBox(height: 10),
Stack(
fit: StackFit.loose,
alignment: AlignmentDirectional.centerEnd,
children: <Widget>[
SizedBox(
width: MediaQuery.of(context).size.width - 40,
child: FlatButton(
onPressed: _isButtonDisabled ? null : () async {
setState(() => _isButtonDisabled = !_isButtonDisabled);
await _con.updateItemsProduct();
List<Cart> stockminimo = _con.carts.where((data) => data.quantity > int.tryParse(data.product.packageItemsCount)).toList();
if(stockminimo.length == 0){
if(_con.total < _con.carts[0].product.market.minimumamount){
_showDialog();
}else{
_con.goCheckout(context);
}
}else{
_onButtonPressed(stockminimo);
}
setState(() => _isButtonDisabled = !_isButtonDisabled);
},
disabledColor: Theme.of(context).focusColor.withOpacity(0.5),
padding: EdgeInsets.symmetric(vertical: 14),
color:
!_con.carts[0].product.market.closed ? Theme.of(context).accentColor : Theme.of(context).focusColor.withOpacity(0.5),
shape: StadiumBorder(),
child: Text(
S.of(context).checkout,
textAlign: TextAlign.start,
style: TextStyle(color: Theme.of(context).primaryColor),
),
),
),
Padding(
padding: const EdgeInsets.symmetric(horizontal: 20),
child: Helper.getPrice(
_con.total,
context,
style: Theme.of(context).textTheme.headline4.merge(TextStyle(color: Theme.of(context).primaryColor)),
),
)
],
),
SizedBox(height: 10),
],
),
),
),
)
],
),
),
),
);
}
这里试试使用PushReplacementNamed。
shape: StadiumBorder(),
onPressed: () {
if (currentUser.value.apiToken != null) {
Navigator.of(context)
.pushNamed('/Cart', arguments: RouteArgument(param: '/Product', id: widget.product.id));
} else {
Navigator.of(context).pushNamed('/Login');
}
},