如何解决更新列表/数组索引时Flutter Bloc状态不会更新状态
我正在尝试在bloc类中实现复选框逻辑。为此，我在下面的类代码中创建了var embed1 = new discord.RichEmbed()
.setTitle("hjgsadgv")
message.channel.send(embed9)
.then(function (message) {
message.react("5️⃣")
.then(() => message.react("4️⃣"))
.then(() => message.react("3️⃣"))
.then(() => message.react("2️⃣"))
.then(() => message.react("1️⃣"))
const filter = (reaction,user) => {
return ['5️⃣','4️⃣','3️⃣','2️⃣','1️⃣'].includes(reaction.emoji.name) && user.id === message.author.id;
}
message.awaitReactions(filter,{ max: 1,time: 60000,errors: ['time'] })
.then(collected => {
const reaction = collected.first();
if (reaction.emoji.name === '5️⃣') {
message.reply('123');
}
else {
message.reply('321');
}
var embed2 = new discord.RichEmbed()
.setTitle("uysygadk")
message.channel.send(embed10)
})
})
。当List<bool> checked事件触发时，状态第一次更新，我可以看到复选框处于选中状态。
CheckBoxClicked但是在那之后，无论调用class CartProductsListBloc
extends Bloc<CartProductsListEvent,CartProductsListState> {
CartProductsListBloc() : super(InitialCartProductsListState());
final ProductRepository productRepository = ProductRepository();
List<bool> checked = List<bool>();
var productsList;
@override
Stream<CartProductsListState> mapEventToState(
CartProductsListEvent event) async* {
if (event is FetchCartProductsList) {
yield FetchingInProgress();
try {
productsList = await productRepository.loadlistofProductInUserCart();
//initialize checked according to productsList
for (int i = 0; i < productsList.length; i++) {
checked.add(false);
}
yield FetchCartProductsListSuccess(
productsList: productsList,checked: checked);
} catch (error) {
yield FetchCartProductsListFail(
error: 'Fail to laod data. Please try again\nor Report the issue');
}
}
if (event is CheckBoxClicked) {
checked[event.index] = !checked[event.index];
yield CheckedBoxClickedHappened(
productsList: productsList,checked: checked);
}
}
}
的状态UI多少次都不会更新。当我热刷新时，出现更改，这意味着逻辑工作正常，但问题是Equatable无法检测到List / array索引中的更改。以下是CheckBoxClicked状态的代码。
CheckedBoxClickedHappened 注意：我通过在bloc类中添加class CheckedBoxClickedHappened extends CartProductsListState {
final productsList;
final checked;
const CheckedBoxClickedHappened({@required this.productsList,@required this.checked});
@override
List<Object> get props => [productsList,checked];
}
来解决此问题，并且每次触发int count = 0;事件时，我都会像下面那样更新count ++
CheckBoxClicked并处于状态
if (event is CheckBoxClicked) {
checked[event.index] = !checked[event.index];
yield CheckedBoxClickedHappened(
productsList: productsList,checked: checked,count: count++);
}
该问题的目的是要知道，Equatable是否无法检测到List索引的更改，或者我做错了什么？如果有任何疑问，请询问我是否会改善。
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