更新Appium1.7.1到1.8.1 1. 命令行更新appium可能需要翻墙 2. 直接用命令：sudo npm install -g appium会出现错误： Error: EACCES: permission denied, mkdir '/usr/local/n/versions/node/10.4.0/lib/node_modules/appium/node_modules/appium-chromedriver/201858-3907-hybcas.w91wc' 更新appium命令换成下面的避免以上错误：
$ sudo npm install -g appium --unsafe-perm=true --allow-root
3. 错误信息：python2: command not found stack Error: Command failed: /user/path/.pyenv/shims/python2 -c import platform; print(platform.python_version());
stack pyenv: python2: command not found
解决办法：用python2所在目录下的python2可执行文件替换在/user/path/.pyenv/shims目录下的python2。
需要用到python2命令，确保python2能正常执行 $ python2 Python 2.7.13 (default, Jul 19 2017, 17:41:39) [GCC 4.2.1 Compatible Apple LLVM 8.1.0 (clang-802.0.42)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> 4. 检查appium是否安装成功： $ sudo npm install appium-doctor -g $ appium-doctor 5. 重新安装依赖 $ brew upgrade Carthage $ brew unlink libimobiledevice $ brew install libimobiledevice --HEAD
$ brew install ios-deploy
$ gem install xcpretty
6. 更新XCUItest driver - WebDriverAgent
官网下载最新的WebDriverAgent：https://github.com/facebook/WebDriverAgent
将文件夹覆盖原来的WebDriverAgent，自动签名／手动签名参照：https://blog.csdn.net/yinshuilan/article/details/80626314
