dart

Flutter - how to add done button in number keyboard in flutter

由 旧城冷巷雨未停 提交于 2020-12-28 16:30:51
问题 I am trying to add done button in number type input for a TextFormField in flutter but I could not able to do that. TextFormField( key: Key(keyValue), initialValue: valueBuilder, onSaved: (text) { fieldsController.text = text.trim(); }, inputFormatters: [inputFormatters], keyboardType: TextInputType.phoneNumber,) I want create a keyboard like the below. For the input text form field. 回答1: Change keyboardType: TextInputType.number to keyboardType: TextInputType.numberWithOptions(signed: true,

Flutter - how to add done button in number keyboard in flutter

由 南楼画角 提交于 2020-12-28 16:24:09
问题 I am trying to add done button in number type input for a TextFormField in flutter but I could not able to do that. TextFormField( key: Key(keyValue), initialValue: valueBuilder, onSaved: (text) { fieldsController.text = text.trim(); }, inputFormatters: [inputFormatters], keyboardType: TextInputType.phoneNumber,) I want create a keyboard like the below. For the input text form field. 回答1: Change keyboardType: TextInputType.number to keyboardType: TextInputType.numberWithOptions(signed: true,

How do you namespace a Dart class?

由 女生的网名这么多〃 提交于 2020-12-28 12:54:23
问题 How do you create a namespace for a Dart class? I come from a C# background, where one would just use namespace SampleNamespace { } . How do you achieve the same in Dart? 回答1: Dart doesn't have the concept of namespaces, but instead it has libraries. You can consider a library to be sort of equivalent to a namespace, in that a library can be made of multiple files, and contain multiple classes and functions. Privacy in Dart is also at the library, rather than the class level (anything

How do you namespace a Dart class?

由 [亡魂溺海] 提交于 2020-12-28 12:53:53
问题 How do you create a namespace for a Dart class? I come from a C# background, where one would just use namespace SampleNamespace { } . How do you achieve the same in Dart? 回答1: Dart doesn't have the concept of namespaces, but instead it has libraries. You can consider a library to be sort of equivalent to a namespace, in that a library can be made of multiple files, and contain multiple classes and functions. Privacy in Dart is also at the library, rather than the class level (anything

How do I read console input / stdin in Dart?

由 依然范特西╮ 提交于 2020-12-28 06:59:32
问题 How do I read console input from stdin in Dart? Is there a scanf in Dart? 回答1: The readLineSync() method of stdin allows to capture a String from the console: import 'dart:io'; main() { print('1 + 1 = ...'); var line = stdin.readLineSync(encoding: Encoding.getByName('utf-8')); print(line.trim() == '2' ? 'Yup!' : 'Nope :('); } 回答2: The following should be the most up to date dart code to read input from stdin. import 'dart:async'; import 'dart:io'; import 'dart:convert'; void main() { readLine

How do I read console input / stdin in Dart?

由 杀马特。学长 韩版系。学妹 提交于 2020-12-28 06:52:33
问题 How do I read console input from stdin in Dart? Is there a scanf in Dart? 回答1: The readLineSync() method of stdin allows to capture a String from the console: import 'dart:io'; main() { print('1 + 1 = ...'); var line = stdin.readLineSync(encoding: Encoding.getByName('utf-8')); print(line.trim() == '2' ? 'Yup!' : 'Nope :('); } 回答2: The following should be the most up to date dart code to read input from stdin. import 'dart:async'; import 'dart:io'; import 'dart:convert'; void main() { readLine

How do I read console input / stdin in Dart?

由 旧时模样 提交于 2020-12-28 06:50:50
问题 How do I read console input from stdin in Dart? Is there a scanf in Dart? 回答1: The readLineSync() method of stdin allows to capture a String from the console: import 'dart:io'; main() { print('1 + 1 = ...'); var line = stdin.readLineSync(encoding: Encoding.getByName('utf-8')); print(line.trim() == '2' ? 'Yup!' : 'Nope :('); } 回答2: The following should be the most up to date dart code to read input from stdin. import 'dart:async'; import 'dart:io'; import 'dart:convert'; void main() { readLine

Flutter AppBar定义顶部Tab切换（滑动）

由 二次信任 提交于 2020-12-28 01:21:21
（一）效果及效果图 效果： 头部的选项可以切换，可以左右滑动 （二）实现 在上一篇博客的基础上加一个属性： isScrollable: true, 以下是全部代码，如果想要运行，就要在main.dart里面写一个入口函数，即在home的位置写Categorypage() import 'package:flutter/material.dart'; class Categorypage extends StatefulWidget { @override _CategorypageState createState() => _CategorypageState(); } class _CategorypageState extends State<Categorypage> { @override Widget build(BuildContext context) { return DefaultTabController( length: 8, child: Scaffold( appBar: AppBar( title: Row( children: [ Expanded( child: TabBar( indicatorColor: Colors.red, isScrollable: true,//多个按钮可以滑动 tabs: <Widget>[ Tab(text:

Flutter Circle Design

由 為{幸葍}努か 提交于 2020-12-27 08:01:53
问题 I want to make this kind of design with these white circles as a raised button. 回答1: Try This! I have added 5 circles you can add more. And instead of RaisedButton use InkResponse . import 'package:flutter/material.dart'; void main() { runApp(new MaterialApp(home: new ExampleWidget())); } class ExampleWidget extends StatelessWidget { @override Widget build(BuildContext context) { Widget bigCircle = new Container( width: 300.0, height: 300.0, decoration: new BoxDecoration( color: Colors.orange

Closure call with mismatched arguments: function '[]' in flutter

由 爱⌒轻易说出口 提交于 2020-12-26 18:48:52
问题 ** I am getting this error** Closure call with mismatched arguments: function '[]' Receiver: Closure: (dynamic) => dynamic from Function 'get':. Tried calling: []("url") Found: [](dynamic) => dynamic my code where I am receiving the data from firestore is this.. import 'package:flutter/material.dart'; import 'package:riyazat_quiz/services/database.dart'; import 'package:riyazat_quiz/views/create_quiz.dart'; import 'package:riyazat_quiz/widgets/widgets.dart'; class Home extends StatefulWidget
订阅 dart