class _TimerDelayedTestPageState extends State{ ///声明 Timer timer; @override void initState() { super.initState(); ///延时2秒 timer = new Timer(Duration(milliseconds: 2000), (){ }); } @override void dispose() { ///取消延时任务 timer.cancel(); super...
Future<dynamic> _loadData() async { await Future.delayed(const Duration(seconds: 10)); return 'Some Data'; } // a reference to the stream subscription // so that we can call _sub.cancel() later StreamSubscription<dynamic>? _sub; // convert the future to a stream _sub = _loadData(...
Future<dynamic> _loadData() async { await Future.delayed(const Duration(seconds: 10)); return 'Some Data'; } // a reference to the stream subscription // so that we can call _sub.cancel() later StreamSubscription<dynamic>? _sub; // convert the future to a stream _sub = _loadData(...
// don't forget to import thisimport'dart:async';// Create a demo futureFuture<dynamic>_loadData()async{awaitFuture.delayed(constDuration(seconds:10));return'Some Data';}// a reference to the stream subscription// so that we can call _sub.cancel() laterStreamSubscription<dynamic>?
1 Future 在Flutter中实现延时 1秒的操作,使用Fluture来实现,代码如下: ///代码清单 1-1 ///方式一 ///参数一 延时的时间 ///参数二 延时执行的方法 Future.delayed(Duration(milliseconds: 1000), () { print("延时1秒执行"); }); ///代码清单 1-2 ...
// don't forget to import thisimport'dart:async';// Create a demo futureFuture<dynamic>_loadData()async{awaitFuture.delayed(constDuration(seconds:10));return'Some Data';}// a reference to the stream subscription// so that we can call _sub.cancel() laterStreamSubscription<dynamic>?_sub;...
Future<void>delay()async{awaitFuture.delayed(Duration(milliseconds:500));// 延迟执行的代码} 使用WidgetsBinding 的 addPostFrameCallback 方法: WidgetsBinding.instance.addPostFrameCallback((_){// 延迟执行的代码}); Timer介绍 Flutter中的Timer类用于创建一个定时器,可以在指定的时间后执行一段代码,或者按照...
1 Future 在Flutter中实现延时 1秒的操作,使用Fluture来实现,代码如下: ///代码清单 1-1 ///方式一 ///参数一 延时的时间 ///参数二 延时执行的方法 Future.delayed(Duration(milliseconds:1000), () { print("延时1秒执行"); }); 1. 2.
1 Future 在Flutter中实现延时 1秒的操作,使用Fluture来实现,代码如下: ///代码清单 1-1 ///方式一 ///参数一 延时的时间 ///参数二 延时执行的方法 Future.delayed(Duration(milliseconds:1000), () { print("延时1秒执行"); }); ///代码清单 1-2 ...
Stream.fromFuture(Future.delayed(Duration(seconds: 1), () => 100)).listen( (event) => print(event), onDone: () => print('is done'), onError: (error, stacktrace) => print('is error, errMsg: $error'), cancelOnError: true);//cancelOnError: true(表示出现error就取消订阅,之后事件...