1 先去下载flutter SDK ：SDK下载地址
2 在终端输入以下指令
vi $HOME/.bash_profile
export PUB_HOSTED_URL=https://pub.flutter-io.cn //国内用户需要设置
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn //国内用户需要设置
export PATH=PATH_TO_FLUTTER_GIT_DIRECTORY/flutter/bin:$PATH
注意：PATH_TO_FLUTTER_GIT_DIRECTORY 为你flutter上级文件夹的路径，比如“~/document/code”
export PATH=~/document/code/flutter/bin:$PATH
刷新当前终端窗口，输入下面指令
source $HOME/.bash_profile
注意: 如果你使用的是zsh，终端启动时 ~/.bash_profile 将不会被加载，解决办法就是修改 ~/.zshrc ，在其中添加：source ~/.bash_profile
通过运行flutter/bin命令验证目录是否在已经在PATH中:
echo $PATH
运行 flutter doctor
flutter doctor
成功的例子如下图
成功图片
常见问题：
安装flutter 出现的问题;
iOS toolchain - develop for iOS devices (Xcode 10.0)
libimobiledevice and ideviceinstaller are not installed. To install with
Brew, run:
brew update
brew install --HEAD usbmuxd
brew link usbmuxd
brew install --HEAD libimobiledevice
brew install ideviceinstaller
ios-deploy not installed. To install with Brew:
brew install ios-deploy
Brew can be used to install tools for iOS device development.
Download brew at [https://brew.sh/.](https://brew.sh/.)
解决方案：先 https://brew.sh/. 去这个网址安装指令， 及时可以使用 brew指令了,提示install xcode ，如果已经安装了xcode，只执行那个指令即可，
brew update
brew install --HEAD usbmuxd
brew link usbmuxd
brew install --HEAD libimobiledevice
brew install ideviceinstaller
brew install ios-deploy
逐步在终端输入这些命令即可
常见问题：
dart SDK 版本过低：更新flutter SDKflutterSDK链接
2、dart 环境配置：
https://blog.csdn.net/weixin_43794749/article/details/106112228
运行open ~/.zshrc
#dart
export DART_HOME=/Users/XXXXXX/Work/Download/flutter/bin/cache/dart-sdk/bin
export PATH="${DART_HOME}:${PATH}"
将/Users/XXXXXX/Work/Download还成自己电脑存放flutter的路径。保存退出
重启vscode（一定是退出重启）
