我从ScopedModel
外面调用ScopedModel
中的方法(按下按钮)。但PlatformException
并没有像我预期的那样捕获。
PlatformException
只接受ScopedModel
方法try/catch
。按钮按下try/catch
没有抓住。
按钮按下:
child: RaisedButton(
onPressed: () async {
try {
await loginModel.signInWithGoogle();
} on PlatformException catch (e) {
debugPrint(e.toString());
}
},
ScopedModel方法:
await _signInWithGoogle();
…
Future<void> _signInWithGoogle() async {
…
throw PlatformException(code: ‘Test Exception’);
} on PlatformException catch (e) {
debugPrint(e.toString());
}
我在PlatformException
中抛出ScopedModel
来测试此方法抛出异常的时间。
为什么会有差异?我想在按钮按下抓住PlatformException
感谢帮助!
它应该工作。看一个非常简单的例子:
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
Login userLogin = Login();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'Simple exception test',
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: () async {
try {
await userLogin.signInWithGoogle();
} on PlatformException catch (e) {
print('Error ...:');
print(e);
}
},
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
class Login {
Future<void> signInWithGoogle() async {
throw PlatformException(code: 'Test Exception');
}
}