Flutter - 使用 GetX 预先填充 TextFormField 的值

Question

的方法，

class FieldOwnerController extends GetxController {
 static FieldOwnerController instance = Get.find();
 var fieldAddress = "".obs;

 ...

//method to populate text field
assignAddress() {
  dynamic argumentData = Get.arguments;
  fieldAddress.value = argumentData["address"];
}

这是控制器，它包含填充文本表单字段UI

      @override
  Widget build(BuildContext context) {
    WidgetsBinding.instance!
        .addPostFrameCallback((_) => fieldOwnerController.assignAddress());
  ...

              Obx(
            () => MultiLineTextField(
              textEditingController: fieldOwnerController.addressCtrlr,
              hintText: "",
              icon: null,
              initialValue: fieldOwnerController.fieldAddress.value,
            ),
          ),

    class MultiLineTextField extends StatelessWidget {
  const MultiLineTextField({
    Key? key,
    required this.textEditingController,
    this.hintText,
    this.icon,
    this.initialValue,
  }) : super(key: key);

  final TextEditingController textEditingController;
  final String? hintText;
  final Icon? icon;
  final String? initialValue;

  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Container(
          width: SizeConfig.screenWidth / 1.2,
          decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(kBorderRadiusMin),
            color: kTextFieldFillColor,
          ),
          child: Padding(
            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 4),
            child: TextFormField(
          /// the new value is assigned correctly here 
              initialValue: initialValue,
              minLines: 2,
              maxLines: 5,
              //controller: textEditingController,
              decoration: InputDecoration(
                icon: icon,
                border: InputBorder.none,
                hintText: hintText,
              ),
            ),
          ),
        ),
      ],
    );
  }
}

我得到了正确的值，但它没有显示在文本字段中。我的意思是，首先，呈现 UI（文本字段为空）。然后 fieldAddress 值发生更改，UI 被重建，但文本字段不显示该值。

这种方法有什么问题吗？

Answer 1

我认为您需要使用分配给字段的textedingcontroller，并设置text属性，并从getxController中使用变量的值