小编Gbe*_*uga的帖子

升级到flutter 3.0.0后。我收到此错误：

Error: Member not found: 'UnicodeChar'.
  int get UnicodeChar => Char.UnicodeChar;

Error: Setter not found: 'UnicodeChar'.
  set UnicodeChar(int value) => Char.UnicodeChar = value;

Error: Member not found: 'AsciiChar'.
  int get AsciiChar => Char.AsciiChar;

Error: Setter not found: 'AsciiChar'.
  set AsciiChar(int value) => Char.AsciiChar = value;

这是图像：

我以SingleChildScrollView这种方式使用时遇到问题，我不知道出了什么问题，我不断收到此错误。

如果添加 SingleChildScrollView，页面将为空白（不会显示所有小部件），但如果我删除 SingleChildScrollView，页面将显示。

\n

RenderBox 未布局：RenderPadding#583c0 relayoutBoundary=up1\nNEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE\n'package:flutter/src/rendering/box.dart'：断言失败：第 1929 行\npos 12：'hasSize

\n

导致错误的相关小部件是 Scaffold\nScaffold:file:///Users/mac/Documents/Uneleap-Platform-master/lib/screens/Pages/forum/forum.dart:25:12

\n

这是代码

SafeArea(\n                minimum: EdgeInsets.only(left: 25.0, right: 20.0, top: 10.0),\n                child: SingleChildScrollView(\n                  child: Column(\n                    crossAxisAlignment: CrossAxisAlignment.start,\n                    mainAxisSize: MainAxisSize.min,\n                    children: [\n                      WidgetForum(\n                        details: 'The Get Is Not Geting together ?',\n                        name: 'Nina Simon',\n                        url: 'assets/dashboard_pic.png',\n                      ),\n                      SizedBox(\n                        height: 5,\n                      ),\n                      WidgetForum(\n                        details:\n                            '''Notes is designed for whatever\xe2\x80\x99s on your mind.\\nJot down your thoughts. Download Notes.\\nThere is something wonderful in writing. …

我创建了一个类，在登录时立即请求许可，它显示在 Android 上，但在 iO 上我没有看到任何许可授予。

class PermissionService {
  Future permissionHandler() async {
    await Permission.contacts.shouldShowRequestRationale;
    if (await Permission.contacts.request().isGranted) {
      // Either the permission was already granted before or the user just granted it.
    }
    Map<Permission, PermissionStatus> statuses = await [
      Permission.locationWhenInUse,
      Permission.locationAlways,
      Permission.photos,
      Permission.camera,
      Permission.location,
      Permission.microphone,
      Permission.notification,
    ].request();

    if (statuses[Permission.location].isDenied) {
      print("Location permission is denied.");
    }

    if (statuses[Permission.camera].isDenied) {
      print("Camera permission is denied.");
    }
    if (statuses[Permission.photos].isDenied) {
      print("Photos permission is denied.");
    }
    if (statuses[Permission.notification].isDenied) {
      print("Notification permission is denied.");
    }
    if …

我正在尝试运行我的代码并不断告诉我

error: no such module 'FirebaseInstanceID'
    import FirebaseInstanceID

我在 AppDelegate.swift 中的代码

import UIKit
import Flutter

import Firebase
import FirebaseAuth
import UserNotifications
import FirebaseInstanceID

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
  
   override func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        let firebaseAuth = Auth.auth()
        firebaseAuth.setAPNSToken(deviceToken, type: AuthAPNSTokenType.unknown)

    }
    override func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping …