flutter - setState() 或 markNeedsBuild() 在动态字段中的 onChange 函数期间在构建期间调用
问题描述
我试图在我使用setstate()的地方更新动态字段onChanged ，但我无法更改 controller.text。我正在使用 api 从后端获取数据并在变量列表中的字段中显示数据，但我无法编辑该字段，可能是由于此错误，我在Listview builder中获得了动态字段，然后定义了控制器并保存更改中的值一个Map<String,dynamic> 我的代码是-
Container(
width: double.infinity,
color: Colors.white,
child: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text("Varient", style: TextStyle(fontSize: 16, color: AppColor.textDarkColor),),
SizedBox(height: 8,),
Container(
width: double.infinity,
color: Colors.white,
height: 250,
child: Form(
key: _formKey,
child: GridView.builder(
gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(
maxCrossAxisExtent: 200,
childAspectRatio: 6 / 2, crossAxisSpacing: 20,
mainAxisSpacing: 0),
itemCount: allAttributes.isEmpty ? 0 : allAttributes.length,
itemBuilder: (BuildContext context, int index) {
_controllers.add(new TextEditingController());
if(allAttributes[index].label == 'MRP'){
widget.productId!=null ?
_controllers[index].text = variantfirst[0].mrpPrice:
_controllers[index].text = '';
}else if(allAttributes[index].label == 'Discount'){
widget.productId!=null ?
_controllers[index].text = variantfirst[0].discount:
_controllers[index].text = '';
}else if(allAttributes[index].label == 'Sort'){
widget.productId!=null ?
_controllers[index].text = variantfirst[0].sort:
_controllers[index].text = '';
}else if(allAttributes[index].label == 'SKU'){
widget.productId!=null ?
_controllers[index].text = variantfirst[0].sku:
_controllers[index].text = '';
}else if(allAttributes[index].label == 'Weight'){
widget.productId!=null ?
_controllers[index].text = variantfirst[0].weight:
_controllers[index].text = '';
}else if(allAttributes[index].label == 'Unit'){
widget.productId!=null ?
_controllers[index].text = variantfirst[0].unitType:
_controllers[index].text = '';
}
else if(allAttributes[index].label == 'Price'){
widget.productId!=null ?
_controllers[index].text = variantfirst[0].price:
_controllers[index].text = toPrice;
myObject.update(allAttributes[index].variantFieldName, (v) => toPrice, ifAbsent: () => toPrice);
}
return TextFormField(
textInputAction: TextInputAction.done,
cursorColor: AppColor.primaryColor,
style: TextStyle(
color: AppColor.textDarkColor, fontSize: 16.0,
),
validator: (val){
if(allAttributes[index].validation == "true" ){
if(val.isEmpty){
// EasyLoading.showToast(allAttributes[index].label+' is Empty',
// toastPosition: EasyLoadingToastPosition.bottom);
// return ;
return allAttributes[index].label +" is empty";
}
return null ;
}
},
onChanged: (val){
setState(() {
if(allAttributes[index].label=='MRP'){
toPrice = mrp = val+".00";
print(toPrice);
myObject.update(allAttributes[index].variantFieldName, (v) => mrp, ifAbsent: () => mrp);
}else if(allAttributes[index].label=='Discount'){
discount = val+".00";
double result = double.parse(mrp) / double.parse(discount);
double resultno = double.parse(mrp) - result;
toPrice = resultno.toString();
print(toPrice);
myObject.update(allAttributes[index].variantFieldName, (v) => val, ifAbsent: () => val);
}else if(allAttributes[index].label=='Price'){
_controllers[index].text = toPrice;
myObject.update(allAttributes[index].variantFieldName, (v) => toPrice, ifAbsent: () => toPrice);
}
else{
myObject.update(allAttributes[index].variantFieldName, (v) => val, ifAbsent: () => val);
}
});
},
keyboardType: allAttributes[index].type =='number'
? TextInputType.number : TextInputType.text ,
controller: _controllers[index],
maxLines: 1,
decoration: InputDecoration(
contentPadding: const EdgeInsets.all(0.0),
labelText: allAttributes[index].label,
hintStyle: TextStyle(color: AppColor.textLightColor)),
);
}
),
),
),
],
),
),
),