Flutter-發送短信驗證碼

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

class Create extends StatefulWidget {
  @override
  _CreateState createState() => _CreateState();
}

class _CreateState extends State<Create> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('手機帳號註冊'),
      ),
      body: Center(
        child: MyBody(),
      ),
    );
  }
}

class MyBody extends StatefulWidget {
  @override
  _MyBodyState createState() => _MyBodyState();
}

class _MyBodyState extends State<MyBody> {
  bool isButtonEnable=true;  //按钮状态 是否可点击
  String buttonText='发送验证码'; //初始文本
  int count=60;      //初始倒计时时间
  Timer timer;      //倒计时的计时器
  TextEditingController mController=TextEditingController();
  TextEditingController phoneController=TextEditingController();

  void _buttonClickListen(){
    setState(() {
      if(isButtonEnable){   //当按钮可点击时
        isButtonEnable=false; //按钮状态标记
        _initTimer();
        return null;   //返回null按钮禁止点击
      }else{     //当按钮不可点击时
//  debugPrint('false');
        return null;    //返回null按钮禁止点击
      }
    });
  }

  void _initTimer(){
    timer = new Timer.periodic(Duration(seconds: 1), (Timer timer) {
      count--;
      setState(() {
        if(count==0){
          timer.cancel();    //倒计时结束取消定时器
          isButtonEnable=true;  //按钮可点击
          count=60;     //重置时间
          buttonText='发送验证码';  //重置按钮文本
        }else{
          buttonText='重新发送($count)'; //更新文本内容
        }
      });
    });
  }

  @override
  void dispose() {
    timer?.cancel();  //销毁计时器
    timer=null;
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      child: Column(
//  mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          Container(
            color: Colors.white,
            padding: EdgeInsets.only(left: 10,right: 10),
            child: Column(
              children: <Widget>[
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
//     crossAxisAlignment: CrossAxisAlignment.center,
                  crossAxisAlignment: CrossAxisAlignment.baseline,
                  textBaseline: TextBaseline.ideographic,
                  children: <Widget>[
                    Text('手機號',style: TextStyle(fontSize: 13,color: Color(0xff333333)),),
                    Expanded(
                      child: Padding(padding: EdgeInsets.only(left: 15,right: 15,top: 15),
                        child: TextFormField(
                          maxLines: 1,
                          onSaved: (value) { },
                          controller: phoneController,
                          textAlign: TextAlign.left,
                          inputFormatters: [WhitelistingTextInputFormatter.digitsOnly,LengthLimitingTextInputFormatter(6)],
                          decoration: InputDecoration(
                            hintText: ('填寫手機號'),
                            contentPadding: EdgeInsets.only(top: -5,bottom: 0),
                            hintStyle: TextStyle(
                              color: Color(0xff999999),
                              fontSize: 13,
                            ),
                            alignLabelWithHint: true,
                            border: OutlineInputBorder(borderSide: BorderSide.none),
                          ),
                        ),),
                    ),
                  ],
                ),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
//     crossAxisAlignment: CrossAxisAlignment.center,
                  crossAxisAlignment: CrossAxisAlignment.baseline,
                  textBaseline: TextBaseline.ideographic,
                  children: <Widget>[
                    Text('驗證碼',style: TextStyle(fontSize: 13,color: Color(0xff333333)),),
                    Expanded(
                      child: Padding(padding: EdgeInsets.only(left: 15,right: 15,top: 15),
                        child: TextFormField(
                          maxLines: 1,
                          onSaved: (value) { },
                          controller: mController,
                          textAlign: TextAlign.left,
                          inputFormatters: [WhitelistingTextInputFormatter.digitsOnly,LengthLimitingTextInputFormatter(6)],
                          decoration: InputDecoration(
                            hintText: ('填寫驗證碼'),
                            contentPadding: EdgeInsets.only(top: -5,bottom: 0),
                            hintStyle: TextStyle(
                              color: Color(0xff999999),
                              fontSize: 13,
                            ),
                            alignLabelWithHint: true,
                            border: OutlineInputBorder(borderSide: BorderSide.none),
                          ),
                        ),),
                    ),
                    Container(
                      width: 120,
                      child: FlatButton(
                        disabledColor: Colors.grey.withOpacity(0.1),  //按钮禁用时的颜色
                        disabledTextColor: Colors.white,     //按钮禁用时的文本颜色
                        textColor:isButtonEnable?Colors.white:Colors.black.withOpacity(0.2),       //文本颜色
                        color: isButtonEnable?Color(0xff44c5fe):Colors.grey.withOpacity(0.1),       //按钮的颜色
                        splashColor: isButtonEnable?Colors.white.withOpacity(0.1):Colors.transparent,
                        shape: StadiumBorder(side: BorderSide.none),
                        onPressed: (){ setState(() {
                          _buttonClickListen();
                        });},
//      child: Text('重新发送 (${secondSy})'),
                        child: Text('$buttonText',style: TextStyle(fontSize: 13,),),
                      ),
                    ),
                  ],
                ),
              ],
            ),
          ),
          Container(
            width: double.infinity,
            height: 45,
            margin: EdgeInsets.only(top: 50,left: 10,right: 10),
            child: RaisedButton(
              onPressed: () {
                debugPrint('手機號：${phoneController.text}，驗證碼：${mController.text}');
              },
              shape: StadiumBorder(side: BorderSide.none),
              color: Color(0xff44c5fe),
              child: Text(
                '註冊',
                style: TextStyle(color: Colors.white,fontSize: 15),
              ),
            ),
          ),
        ],
      ),
    );
  }
}