我创建了一个服务文件夹并在其中创建了一个名为 request.txt 的文件。 dart,在这里我打算将我提出的所有请求放入一个名为 AuthService 的类中,下面的登录请求我希望能够在 response.statusCode == 200 或 201 后导航到主屏幕,但我无法这样做,因为导航需要上下文,我的类既不是有状态也不是无状态小部件,有什么方法可以在没有上下文的情况下导航?
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:shared_preferences/shared_preferences.dart';
import 'package:flutter/material.dart';
class AuthService {
login(email, password) async {
SharedPreferences sharedPreferences = await SharedPreferences.getInstance();
if (email == "" && password == "") {
return;
}
try {
Map data = {'email': email, 'password': password};
var jsonResponse;
var response = await http
.post('https://imyLink.com/authenticate', body: data);
if (response.statusCode == 200 || response.statusCode == 201) {
//I want to navigate to my home screen once the request made is successful
jsonResponse = json.decode(response.body);
if (jsonResponse != null) {
await sharedPreferences.setString("userToken", jsonResponse["token"]);
var token = sharedPreferences.getString("userToken");
print('Token: $token');
print(jsonResponse);
print("Login successful");
}
} else {
print(response.statusCode);
print('Login Unsuccessful');
print(response.body);
}
} catch (e) {
print(e);
}
}
最佳答案
首先,创建一个类
import 'package:flutter/material.dart';
class NavigationService{
GlobalKey<NavigatorState> navigationKey;
static NavigationService instance = NavigationService();
NavigationService(){
navigationKey = GlobalKey<NavigatorState>();
}
Future<dynamic> navigateToReplacement(String _rn){
return navigationKey.currentState.pushReplacementNamed(_rn);
}
Future<dynamic> navigateTo(String _rn){
return navigationKey.currentState.pushNamed(_rn);
}
Future<dynamic> navigateToRoute(MaterialPageRoute _rn){
return navigationKey.currentState.push(_rn);
}
goback(){
return navigationKey.currentState.pop();
}
}
在您的 main.dart 文件中。 MaterialApp(
navigatorKey: NavigationService.instance.navigationKey,
initialRoute: "login",
routes: {
"login":(BuildContext context) =>Login(),
"register":(BuildContext context) =>Register(),
"home":(BuildContext context) => Home(),
},
);
然后您可以从项目中的任何位置调用该函数,例如... NavigationService.instance.navigateToReplacement("home");
NavigationService.instance.navigateTo("home");
关于flutter - 在没有上下文的情况下导航,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/63324364/