flutter_countdown

An easy way to use count down

How to use flutter_countdown

  1. Open the pubspec.yaml file, and add flutter_countdown: <latest_version> unde dependencies:
  dependencies:
    flutter:
      sdk: flutter
    # ...
    # ...
    flutter_countdown: ^0.1.3
  1. install it from terminal: Run flutter packages get

Example

example

import "package:flutter/material.dart";
import 'package:flutter_countdown/countdown.dart';

void main() {
  runApp(Example());
}

class Example extends StatelessWidget {
  final int beginCount = 5;
  
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new Card(
          child: new Center(
        child: CountDown(
          renderSemanticLabel: (count) {
            if (count == beginCount) {
              return "点击获取验证码";
            }
            return "$count 秒后重试";
          },
          beginCount: beginCount,
          endCount: 0,
          onPress: (ctr) {
            if (ctr.isAnimating) {
              return  Future.value(false);
            }
            return Future.value(true);
          }
        ),
      )),
    );
  }
}

stackoverflow

Libraries

countdown

Dart

dart:ui
Built-in types and core primitives for a Flutter application. [...]

Core

dart:async
Support for asynchronous programming, with classes such as Future and Stream. [...]
dart:collection
Classes and utilities that supplement the collection support in dart:core. [...]
dart:convert
Encoders and decoders for converting between different data representations, including JSON and UTF-8. [...]
dart:core
Built-in types, collections, and other core functionality for every Dart program. [...]
dart:developer
Interact with developer tools such as the debugger and inspector. [...]
dart:math
Mathematical constants and functions, plus a random number generator. [...]
dart:typed_data
Lists that efficiently handle fixed sized data (for example, unsigned 8 byte integers) and SIMD numeric types. [...]

VM

dart:io
File, socket, HTTP, and other I/O support for non-web applications. [...]
dart:isolate
Concurrent programming using isolates: independent workers that are similar to threads but don't share memory, communicating only via messages. [...]