開啟終端：

brew install node

看到

輸入npm -v 後檢視安裝成功的node.js

然後執行
npm install -g react-native-cli

安裝react-native 命令列工具

react-native –help

可以檢視命令列工具支援的命令

接下來安裝Xcode
之後安裝Android Studio

然後初始化一個應用

react-native init FirstApp

如果收到-bash:react-native:command not found

則輸入
npm list -g | head -n 1
得到
/usr/local/Cellar/node/8.1.4/lib
得到react native 安裝的路徑

open .bash_profile
新增
export PATH=”/usr/local/Cellar/node/8.1.4/bin:$PATH”

source .bash_profile

再次執行

react-native init FirstApp

則看到成功建立第一個apk

用命令後執行iOS專案

cd FirstApp
執行
react-native run-ios

如果遇到錯誤：
xcrun: error: unable to find utility “instruments”, not a developer tool or in PATH
則要執行
sudo xcode-select -s /Applications/Xcode.app/Contents/Developer/
再次執行遇到錯誤：

Installing build/Build/Products/Debug-iphonesimulator/MyFirsrRNapp.app
An error was encountered processing the command (domain=NSPOSIXErrorDomain, code=2):
Failed to install the requested application
An application bundle was not found at the provided path.
Provide a valid path to the desired application bundle.
Print: Entry, “:CFBundleIdentifier”, Does Not Exist

Command failed: /usr/libexec/PlistBuddy -c Print:CFBundleIdentifier build/Build/Products/Debug-iphonesimulator/MyFirsrRNapp.app/Info.plist
Print: Entry, “:CFBundleIdentifier”, Does Not Exist

首先要啟動一個android模擬器
react-native run-android

分別執行倆個平臺的專案

要安裝好各自的模擬器

可以通過Xcode 執行iOS專案，雙擊
FirstApp.xcodeproj
點選執行按鈕
通過a s 執行android專案，open新的專案
啟動模擬器
點選執行