想要在iOS上使用Flutter实现短信

Question

Flutter send sms with device automatically

我在Flutter中实现了此问题中给出的代码，并在iOS应用中运行了该代码。但是，我遇到了一个MissingPluginException异常（找不到在通道Send SMS上发送方法的实现）

代码

import 'package:flutter/material.dart';

import 'package:flutter/widgets.dart';

import 'package:flutter/services.dart';

import 'package:sms/contact.dart';

import 'login_page.dart';
class SendSMS extends StatefulWidget{
  _SendSMS createState() => new _SendSMS();
}
class _SendSMS extends State<SendSMS>{
@override

static const platform = const MethodChannel('Send SMS ');
Future<Null> send()async {
print("SendSMS");
try {
  **final String result = await platform.invokeMethod('send', 
<String,dynamic>{"msg":"Hello! I'm sent programatically."});**
} on PlatformException catch (e) {`enter code here`
  print(e.toString());
}
}
Widget build(BuildContext context) {
// TODO: implement build

return new Material(
  child : new Container(
    alignment: Alignment.center,
    child : new FlatButton(onPressed: send, child: new Text('send SMS 
 '))
  ),
);
}
}

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

import 'package:flutter/widgets.dart';

import 'package:flutter/services.dart';

import 'package:sms/contact.dart';

import 'login_page.dart';
class SendSMS extends StatefulWidget{
  _SendSMS createState() => new _SendSMS();
}
class _SendSMS extends State<SendSMS>{
@override

static const platform = const MethodChannel('Send SMS ');
Future<Null> send()async {
print("SendSMS");
try {
  **final String result = await platform.invokeMethod('send', 
<String,dynamic>{"msg":"Hello! I'm sent programatically."});**
} on PlatformException catch (e) {`enter code here`
  print(e.toString());
}
}
Widget build(BuildContext context) {
// TODO: implement build

return new Material(
  child : new Container(
    alignment: Alignment.center,
    child : new FlatButton(onPressed: send, child: new Text('send SMS 
 '))
  ),
);
}
}`What should i change to make this working ?