我想在一个函数中定义具有不同形式接口的有效载荷。
每个有效负载如下，我已经定义了“ UpdatePayload”接口，如下所示：
vector<Record> records;
vector<Record*> sortedRecords;
// populate records as needed...
dmaArr(sortedRecords, records);
// use sortedRecords as needed...
但是，函数内部的代码会产生以下错误：
/*
ex) payload interface
const interface updateBodyPayload = {
title: ...
content: ...
}
*/
/*
ex) payload interface
const interface updateStatePayload = {
type: ..
count: ..
}
*/
// Payload Merge interface
export type updatePayload = Partial<updateBodyPayload | updateStatePayload>;
我犯了什么错误？
答案 0 :(得分：2)
如果您想让import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() {
runApp(MyApp());
SystemChrome.setSystemUIOverlayStyle(
SystemUiOverlayStyle(
statusBarColor: Colors.transparent,
statusBarBrightness: Brightness.light),
);
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: ('SplashScreeen'),
home: MySplashScreen(title: 'SplashScreen'),
);
}
}
class MySplashScreen extends StatefulWidget {
MySplashScreen({Key key, this.title}) : super(key: key);
final String title;
@override
_MySplashScreenState createState() => _MySplashScreenState();
}
class _MySplashScreenState extends State<MySplashScreen>
with TickerProviderStateMixin {
AnimationController fadeAnimationLogoController;
AnimationController moveUpAnimationLogoController;
Animation<double> fadeAnimationLogo;
Animation<Offset> moveUpAnimationLogo;
bool showWelcome = false;
initState() {
super.initState();
fadeAnimationLogoController =
AnimationController(duration: Duration(seconds: 5), vsync: this);
moveUpAnimationLogoController = AnimationController(
duration: Duration(seconds: 5),
vsync: this,
);
fadeAnimationLogo = CurvedAnimation(
parent: fadeAnimationLogoController, curve: Curves.easeIn);
moveUpAnimationLogo = Tween<Offset>(
begin: Offset(0, 0),
end: Offset(0, -0.2),
).animate(moveUpAnimationLogoController);
fadeAnimationLogoController.forward();
fadeAnimationLogoController.addListener(() {
if (fadeAnimationLogo.status == AnimationStatus.completed) {
moveUpAnimationLogoController.forward();
}
});
moveUpAnimationLogoController.addListener(() {
if (moveUpAnimationLogo.status == AnimationStatus.completed) {
//moveUpAnimationLogoController.forward();
setState(() {
showWelcome = true;
});
}
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: <Widget>[
Container(
color: Colors.white,
child: FadeTransition(
opacity: fadeAnimationLogo,
child: SlideTransition(
position: moveUpAnimationLogo,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Image(
image: AssetImage('assets/images/csrhuntlogo.png'),
height: 300,
width: 300,
),
Text(
('C S R H U N T'),
style: TextStyle(
fontFamily: 'League Spartan',
height: 1,
fontSize: 34,
color: Colors.black,
decoration: TextDecoration.none,
),
),
Text(
('FIND PLAY EARN'),
style: TextStyle(
fontFamily: 'Montserrat',
height: 1,
fontSize: 15,
color: Colors.black,
decoration: TextDecoration.none,
),
),
],
),
),
),
),
showWelcome
? Expanded(
child: WelcomeScreen(
title: "test",
),
)
: Container(),
],
),
);
}
}
class WelcomeScreen extends StatefulWidget {
WelcomeScreen({Key key, this.title}) : super(key: key);
final String title;
@override
_WelcomeScreenState createState() => _WelcomeScreenState();
}
class _WelcomeScreenState extends State<WelcomeScreen>
with SingleTickerProviderStateMixin {
AnimationController fadeAnimationWelcomeController;
Animation<double> fadeAnimationWelcome;
@override
void initState() {
fadeAnimationWelcomeController = AnimationController(
vsync: this,
duration: Duration(milliseconds: 2000),
);
fadeAnimationWelcome = CurvedAnimation(
parent: fadeAnimationWelcomeController, curve: Curves.easeIn);
super.initState();
fadeAnimationWelcomeController.forward();
}
@override
Widget build(BuildContext context) {
return Container(
color: Colors.white,
child: FadeTransition(
opacity: fadeAnimationWelcome,
child: Stack(
children: <Widget>[
Positioned(
top: 590,
left: 20,
child: SizedBox(
width: 350.0,
height: 50.0,
child: RaisedButton(
color: new Color.fromRGBO(255, 213, 0, 1.0),
textColor: Colors.black,
onPressed: () {},
child: Text(
'log in',
style: TextStyle(
height: 1,
fontSize: 25,
fontFamily: 'League Spartan',
),
),
shape: RoundedRectangleBorder(
borderRadius: new BorderRadius.circular(18.0),
side: BorderSide(color: Colors.transparent),
),
),
),
),
Positioned(
bottom: 50,
left: 20,
child: SizedBox(
width: 350.0,
height: 50.0,
child: RaisedButton(
color: new Color.fromRGBO(255, 213, 0, 1.0),
textColor: Colors.black,
onPressed: () {},
child: Text(
'Sign up',
style: TextStyle(
height: 1,
fontSize: 25,
fontFamily: 'League Spartan',
),
),
shape: RoundedRectangleBorder(
borderRadius: new BorderRadius.circular(18.0),
side: BorderSide(color: Colors.transparent),
),
),
),
),
],
),
),
);
}
}
输入合并形式updatePayload和updateBodyPayload的结果，那么它必须类似于：（updateStatePayload而不是{{1} }）
&现在|将会是：
type updatePayload = Partial<updateBodyPayload & updateStatePayload>;