然后我在q群里问了问题有个人的解决办法是 main()里future.delay 两秒后再 runapp() image.png voidmain(){newFuture.delayed(Duration(seconds:2),()=>runApp());} 为了保险,我两个方法都用,顺序是 1:在main函数里添加延迟执行runapp()方法 2:在Android studio里用自带终端执行 flutter build ios 3:...
在「asynchronous」generator中我们也可以使用Future相关的函数: Stream<int>countStream(intn)async*{ for(vari=1;i<=n;i++){ //dummydelay-thiscouldbeanetworkrequest awaitFuture.delayed(Duration(seconds:1)); yieldi; } } 最后 希望大家喜欢我提供的这写小技巧,快来使用它们来改进 Flutter 应用程序中的...
delayWithFutureThen(){Future.delayed(Duration(seconds:5),(){int age=30;returnage;}).then((onValue){onValue++;print('我多大了啊 $onValue');});/* flutter: 我多大了啊 31 */} Future还有很多有意思的方法,比如 Future.doWhile() 、Future.any()、Future.wait(),我们简单的看一个,比如Future....
2. some time 后把任务加入(并非执行!) event queue用 Future.delayed(): // After a one-second delay, adds a task to the event queue. new Future.delayed(const Duration(seconds:1), () { // …code goes here… }); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 注意: Future 或 Future.d...
delay: Duration(seconds:2)); await enableFluttifyLog(false);//关闭log_loadData(latLng); } }, onMapMoveEnd: (MapMove move) async { _loadData(move.latLng); }, ), Center( child: Icon( Icons.place, size:36.0, color: Color(0xFFFF0000), ...
当任务需要延迟执行时,可以使用new Future.delay来将任务延迟执行,而如上所述,只有当Main isolate的Event Queue处于Idle的状态时,才会延迟1s执行,否则等待的时间会比1s长很多 new Future.delayed(const Duration(seconds: 1), () => futureTask); Future中的then并没有创建新的Event丢到Event Queue中,而只是一个...
另外为了演示方便,就直接打开后 delay 1s 返回。 代码如下: import 'package:flutter/material.dart'; void main() => runApp(MaterialApp( home: MyApp(), )); class MyApp extends StatelessWidget { // This widget is the root of your application. @override Widget build(BuildContext context) { ...
loopIntegers(){// 通过 then 进行获取到 Future 对象后的操作getListDelay().then((ints)=>ints.forEach((i)=>print(i)));}// 生成一个 Future 对象Future<List<int>>getListDelay(){returnFuture.delayed(Duration(seconds:2),()=>List.generate(10,(delta)=>delta));} ...
});// Simulating a delay of 2 secondsawait Future.delayed(Duration(seconds:2)); final List<String> urls = ['https://img_01.jpg','https://img_02.jpg','https://img_03.jpg', ... ]; try { setState(() { imageUrls.addAll(urls); ...
seconds - 3.minutes + 2.hours; //Before await Future.delayed(Duration(seconds: 2)) //After await 2.seconds.delay visit time.dart Tip 20 : Testing errors You can simply test if two values are equal in dart with expect(actual, expected) But if you want to test errors use the function...