cocoapods 更新

總共就下面幾個命令行

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

如下是有可能出現的問題

1.升級Ruby環境

gem update --system

1.1若報錯

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

命令行換成

sudo gem update --system

1.2若報錯

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

命令行換成

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

1.3 若報錯

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

ruby 版本太低，更新ruby , 第一次經過RVM失敗，換成了Homebrew安裝成功了

方式一: RVM方式安裝

參照 ruby china wiki

// 1.先安裝ruby版本管理器RVM

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

// 2.驗證RVM

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

// 3.測試是否安裝正常

rvm -v

// 4.查看ruby最新版本

rvm list known

// 5.安裝ruby 2.4.1

 rvm install 2.4.1

方式二: Homebrew安裝ruby

// 1.安裝 Homebrew

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

若報錯

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

執行

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

或

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


[參考連接] (https://apple.stackexchange.com/questions/42127/homebrew-permissions-multiple-users-needing-to-brew-update)

若報錯

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

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

// 2.驗證brew是否安裝成功

brew

安裝成功後，會返回
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.安裝 ruby, 經過下面的命令會安裝最新的ruby版本

brew install ruby

// 5.安裝後查看ruby版本仍是老版本

source ～／.profile
source ~/.bash_profile

1.4若報錯

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

請升級ruby

2.更換Ruby鏡像

// 檢查現有 Ruby鏡像
gem sources -l
若是結果是 
*** CURRENT SOURCES ***
https://gems.ruby-china.org/
就不須要替換了，不然就要替換，執行下面命令
// 移除現有鏡像
gem sources --remove https://rubygems.org
// 添加國內鏡像
gem source -a https://gems.ruby-china.org/
// 檢查是否替換成功
gem sources -l

3.安裝 Cocoapods

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

4.創建索引庫

pod setup

5.查看版本

pod --version

6.pod search AFNetworking

若報錯

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

執行命令行

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

而後再執行 pod search AFNetworking ，會從新創建索引，須要花費一會時間