cocoapods 更新

总共就下面几个命令行

sudo gem update -n /usr/local/bin --system
gem source -l
gem sources --remove 上面返回的路径
gem source -a https://gems.ruby-china.org/
sudo gem install -n /usr/local/bin cocoapods
pod setup
pod --version
pod search AFNetWorking

以下是有可能出现的问题

1.升级Ruby环境

gem update --system

1.1若报错

ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.3.0 directory.

命令行换成

sudo gem update --system

1.2若报错

ERROR:  While executing gem ... (Errno::EPERM)
    Operation not permitted - /usr/bin/update_rubygems

命令行换成

sudo gem update -n /usr/local/bin --system

1.3 若报错

YAML safe loading is not available. Please upgrade psych to a version that supports safe loading (>= 2.0).

ruby 版本过低，更新ruby , 第一次通过RVM失败，换成了Homebrew安装成功了

方式一: RVM方式安装

参照 ruby china wiki

// 1.先安装ruby版本管理器RVM

curl -L get.rvm.io | bash -s stable

// 2.验证RVM

source ～／.profile
source ~/.bashrc
source ~/.bash_profile

// 3.测试是否安装正常

rvm -v

// 4.查看ruby最新版本

rvm list known

// 5.安装ruby 2.4.1

 rvm install 2.4.1

方式二: Homebrew安装ruby

// 1.安装 Homebrew

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

若报错

error: could not lock config file /usr/local/Homebrew/.git/config: Permission denied

执行

sudo chgrp -R admin /usr/local
sudo chmod -R g+w /usr/local

或

sudo chown -R $(whoami) /usr/local


[参考链接] (https://apple.stackexchange.com/questions/42127/homebrew-permissions-multiple-users-needing-to-brew-update)

若报错

Error: /usr/local/Cellar is not writable. You should change the 
ownership and permissions of /usr/local/Cellar back to your 

执行
sudo chown -R $(whoami) /usr/local/Cellar

// 2.验证brew是否安装成功

brew

安装成功后，会返回
Example usage: 
brew search [TEXT|/REGEX/] 
brew (info|home|options) [FORMULA…] 
brew install FORMULA… 
brew update 
brew upgrade [FORMULA…] 
brew uninstall FORMULA… 
brew list [FORMULA…]

// 3.更新最新版本brew

brew update

// 4.安装 ruby, 通过下面的命令会安装最新的ruby版本

brew install ruby

// 5.安装后查看ruby版本还是老版本

source ～／.profile
source ~/.bash_profile

1.4若报错

ERROR:  SSL verification error at depth 1: unable to get local issuer certificate (20)
ERROR:  You must add /O=Digital Signature Trust Co./CN=DST Root CA X3 to your local trusted store

请升级ruby

2.更换Ruby镜像

// 检查现有 Ruby镜像
gem sources -l
如果结果是 
*** CURRENT SOURCES ***
https://gems.ruby-china.org/
就不需要替换了，否则就要替换，执行下面命令
// 移除现有镜像
gem sources --remove https://rubygems.org
// 添加国内镜像
gem source -a https://gems.ruby-china.org/
// 检查是否替换成功
gem sources -l

3.安装 Cocoapods

sudo gem install cocoapods
若出现
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /usr/bin directory.
则换成下面的命令行
sudo gem install -n /usr/local/bin cocoapods

4.建立索引库

pod setup

5.查看版本

pod --version

6.pod search AFNetworking

若报错

 [!] Unable to find a pod with name, author, summary, or description matching `AFNetworking`

执行命令行

rm  ~/Library/Caches/CocoaPods/search_index.json

然后再执行 pod search AFNetworking ，会重新建立索引，需要花费一会时间