-> $event'); }).onDone(() { print('Stream.periodic -> done 结束'); }); } ?...-> $event'); }).onDone(() { print('Stream.periodic -> done 结束'); }); ?...-> $event'); }).onDone(() { print('Stream.periodic -> done 结束'); }); ?...-> $event'); }).onDone(() { print('Stream.periodic -> done 结束'); }); ?...-> $event'); }).onDone(() { print('Stream.periodic -> done 结束'); }); ?
Stream.periodic:创建一个周期性地产生事件的 Stream。 StreamController:手动控制 Stream 的事件和错误。...例如,你可以使用 StreamZip 来同步处理两个 Stream 的数据事件: void main() async { var stream1 = Stream.periodic(Duration...(seconds: 1), (x) => x).take(5); var stream2 = Stream.periodic(Duration(seconds: 2), (x) => x).take...例如,下面的代码使用 Stream.periodic 创建了一个每秒执行一次的定时任务: void main() { // 创建一个每秒触发一次的 Stream Stream.periodic(
:async'; int callBack(int value){ return value; } createStream() async{ Stream stream = Stream.periodic...value; } createStream() async { Duration interval = Duration(seconds: 1); Stream stream = Stream.periodic...value; } createStream() async { Duration interval = Duration(seconds: 1); Stream stream = Stream.periodic...value; } createStream() async { Duration interval = Duration(seconds: 1); Stream stream = Stream.periodic...async'; int callBack(int value) { return value; } createStream() async { Stream stream = Stream.periodic
仔细看一下就知道整个流程了 StreamBuilder 介绍 上面的 FutureBuilder 只能给我们一个值,而 StreamBuildder 可以给我们一连串的值 ,例如: final stream = Stream.periodic...) { print(event); }); 复制代码 示例 class _MyHomePageState extends State { final stream = Stream.periodic...FutureBuilder 差不多,只不过多了一个 active 状态,这个状态在上面没有说是因为用不到**,在这里的意思指的就是数据流是否为活跃的**,如果是活跃的,则就可以获取他的值了 创建方式及常用的函数 使用 Stream.periodic
Exception('something went wrong')); Stream.fromFuture(Future.delayed(Duration(seconds: 1), () => 42)); Stream.periodic...使用 Stream.periodic 创建周期性的事件流。 16.
class MyTimer { static Stream timerInterval$ = new Stream.periodic(Duration(seconds: 1)).map
Exception('something went wrong')); Stream.fromFuture(Future.delayed(Duration(seconds: 1), () => 42)); Stream.periodic...用于Stream.periodic创建周期性的事件流。您可以将 a 指定Duration为事件之间的时间间隔,并指定一个匿名函数来生成给定其在流中的索引的每个值。 16.
GlobalData extends InheritedWidget { final int count; final Stream timeInterval$ = new Stream.periodic
Stream.fromFutures(Iterable> futures)//由多个Future对象创建 Stream.fromIterable(Iterable elements)//由可迭代对象创建 Stream.periodic
message; HeroAsyncMessageComponent() { resend(); } void resend() { message = new Stream.periodic
StreamProvider(create: (context) { return Stream.periodic(Duration(seconds: 1), (data) => Model1().
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