flutter class小部件“观看”功能有错误

发布于 2025-02-04 08:22:21 字数 305 浏览 3 评论 0原文

我想通过手表函数制作一个var，但是它不断发生和错误，这是代码：

class Booking extends ConsumerWidget {
  @override
  Widget build(BuildContext context, watch) {
    var step = watch(currentStep).state;
    var mallWatch = watch(selectedMall).state;

var内部的“手表”继续获得红色下划线，错误是“表达式未评估到功能，所以无法调用“请帮忙，谢谢

原文

I want to make a var with watch function, but it keep getting and error this is the code :

class Booking extends ConsumerWidget {
  @override
  Widget build(BuildContext context, watch) {
    var step = watch(currentStep).state;
    var mallWatch = watch(selectedMall).state;

the "watch" inside the var keep getting a red underline, the error is "The expression doesn't evaluate to a function, so it can't be invoked" please help, thank you

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晨与橙与城 2025-02-11 08:22:22

通过

class Booking extends ConsumerWidget {
  @override
  Widget build(BuildContext context, WidgetRef ref) {
    // not sure .state is necessary, depends on what you're trying to retrieve
    var step = ref.watch(currentStep).state;
    var mallWatch = watch(selectedMall).state;
    ...
  }
}

Skimmed through Riverpod docs and apparently your code should be:

class Booking extends ConsumerWidget {
  @override
  Widget build(BuildContext context, WidgetRef ref) {
    // not sure .state is necessary, depends on what you're trying to retrieve
    var step = ref.watch(currentStep).state;
    var mallWatch = watch(selectedMall).state;
    ...
  }
}

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