1、去flutter官網下載安裝包，下載Dev channel，macOS

https://flutter.io/sdk-archive/#macos

2、macOS下是自動解壓了，進入flutter/bin目錄後執行。如果提示有問題，看後面幾點解決辦法。

./flutter doctor

如果提示xcrun不存在，執行以下命令安裝

xcode-select --install

3、安裝brew

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

brew update
brew uninstall --ignore-dependencies libimobiledevice
brew uninstall --ignore-dependencies usbmuxd
brew install --HEAD usbmuxd
brew unlink usbmuxd
brew link usbmuxd
brew install --HEAD libimobiledevice
brew install ideviceinstaller ios-deploy cocoapods
pod setup