Flutter.h 未找到问题 Flutter 2答案

【问题标题】：Flutter.h not found issue Flutter 2Flutter.h 未找到问题 Flutter 2
【发布时间】：2021-11-21 07:52:27
【问题描述】：

我遇到了这个问题，我的应用程序没有构建，因为它说

fatal error: 'Flutter/Flutter.h'
file not found
#import <Flutter/Flutter.h>

我整天都在研究这个问题，但没有得到任何结果。这是一个简单的程序（打开flutter新项目时得到的初始代码），并添加了firebase_core。

整个 XCode 输出：

    Xcode's output:
↳
    In file included from
    /Users/alfieanil/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_cor
    e-1.10.0/ios/Classes/FLTFirebaseCorePlugin.m:5:
    /Users/alfieanil/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_cor
    e-1.10.0/ios/Classes/FLTFirebaseCorePlugin.h:9:9: fatal error: 'Flutter/Flutter.h'
    file not found
    #import <Flutter/Flutter.h>
            ^~~~~~~~~~~~~~~~~~~
    1 error generated.
    note: Using new build system
    note: Building targets in parallel
    note: Planning build
    note: Constructing build description

直到一两个月前，我的 Flutter 都运行良好。颤振版本 = 2.0.6

非常感谢任何帮助。

谢谢

【问题讨论】：

标签： firebase flutter flutter-2

【解决方案1】：

我设法通过以下步骤修复它：

1. Open your terminal in root level of your project.
2. run flutter upgrade.
3. Change SDK version in pubspec.yaml file
4. In my pubspec.yaml I just changed This line sdk: “>=2.7.0 <3.0.0” and replaced with sdk: “>=2.12.0 <3.0.0”
5. flutter clean
6. flutter run.

原文链接：https://fluttercorner.com/error-null-safety-features-are-disabled-for-this-library/（方案一）

【讨论】：