cocoapods更新(Failed to connect to

今天由于项目开发需求 需要集成下友盟推送，本以为轻车熟路，对着开发文档准备一波行云流水的操作。却发现友盟更新的'UMCCommon'怎么也search不到，我的pod的版本低了？于是更新我的pod，却始终更新不了（Updating spec repo `master`[!] Failed to connect to GitHub to update the CocoaPods/Specs specs repo - Please checkifyou are offline,orthat GitHubisdown）这就很尴尬啊。

搜索才发现是Github在不久之前的2018年2月23号移除了一些低加密标准协议，包括TLSv1/TLSv1.1，diffie-hellman-group1-sha1，diffie-hellman-group14-sha1，相关链接在这里：Weak cryptographic standards removed。

这就意味着Mac系统对应的openssl也需要更新。更新命令搬在下面：

$whichopenssl

/usr/bin/openssl

$ openssl version

OpenSSL 0.9.8zh 14 Jan 2016/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

$ brew update

$ brew install openssl

$ brew upgrade openssl

`` If you need to have this software first in your PATH run: echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.bash_profile

$echo'export PATH="/usr/local/opt/openssl/bin:$PATH"'>> ~/.bash_profile

$source~/.bash_profile

$whichopenssl

/usr/local/opt/openssl/bin/openssl

$ openssl version

OpenSSL 1.0.2n 7 Dec 2017

以上是更新mac的openssl，我上来就撸了一遍，在执行更新cocoapods，并没有什么卵用啊。在百度妈妈的精心辅导下，终于还是很顺利的搞定了

1.了解当前安装的Ruby源地址：gem sources

*** CURRENT SOURCES ***

https://gems.ruby-china.org/

2.移除上面的镜像地址：gem sources --remove https://gems.ruby-china.org

source https://gems.ruby-china.org not present in cache

3.添加   ：gem sources -a https://rubygems.org

https://rubygems.org added to sources

4.开始安装：sudo gem install cocoapods （输入密码后耐心等待一段时间。。。。。。。。）

如果出现 WARNING: Unable to pull data from 'https://gems.ruby-china.org/': bad response Not Found 404 (https://gems.ruby-china.org/specs.4.8.gz)

执行命令 ：curl -sSL https://get.rvm.io | bash -s stable

Downloading https://github.com/rvm/rvm/archive/1.29.4.tar.gz

Downloading https://github.com/rvm/rvm/releases/download/1.29.4/1.29.4.tar.gz.asc

Found PGP signature at: 'https://github.com/rvm/rvm/releases/download/1.29.4/1.29.4.tar.gz.asc',

but no GPG software exists to validate it, skipping.

Upgrading the RVM installation in /Users/wofuminshengkeji/.rvm/

    RVM PATH line found in /Users/wofuminshengkeji/.mkshrc /Users/wofuminshengkeji/.profile /Users/wofuminshengkeji/.bashrc /Users/wofuminshengkeji/.zshrc.

    RVM sourcing line found in /Users/wofuminshengkeji/.profile /Users/wofuminshengkeji/.bash_profile /Users/wofuminshengkeji/.zlogin.

Upgrade of RVM in /Users/wofuminshengkeji/.rvm/ is complete.

  * No new notes to display.

5.查看ruby的版本： rvm list known

获得一一列的版本 

6.安装最新的ruby的版本：rvm install ruby 2.4（我这里用的是2.4）

Searching for binary rubies, this might take some time.

No binary rubies available for: osx/10.12/x86_64/ruby-2.4.4.

Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.

Checking requirements for osx.

Certificates bundle '/usr/local/etc/openssl@1.1/cert.pem' is already up to date.

Requirements installation successful.

Installing Ruby from source to: /Users/wofuminshengkeji/.rvm/rubies/ruby-2.4.4, this may take a while depending on your cpu(s)...

ruby-2.4.4 - #downloading ruby-2.4.4, this may take a while depending on your connection...

  % Total    % Received % Xferd  Average Speed  Time    Time    Time  Current

                                Dload  Upload  Total  Spent    Left  Speed

100 12.0M  100 12.0M    0    0  139k      0  0:01:28  0:01:28 --:--:-- 69894

ruby-2.4.4 - #extracting ruby-2.4.4 to /Users/wofuminshengkeji/.rvm/src/ruby-2.4.4.....

ruby-2.4.4 - #configuring......................................................-

ruby-2.4.4 - #post-configuration.

ruby-2.4.4 - #compiling........................................................-

ruby-2.4.4 - #installing.......

ruby-2.4.4 - #making binaries executable..

ruby-2.4.4 - #downloading rubygems-2.7.7

ruby-2.4.4 - #extracting rubygems-2.7.7......

ruby-2.4.4 - #removing old rubygems........

ruby-2.4.4 - #installing rubygems-2.7.7................................

ruby-2.4.4 - #gemset created /Users/wofuminshengkeji/.rvm/gems/ruby-2.4.4@global

ruby-2.4.4 - #importing gemset /Users/wofuminshengkeji/.rvm/gemsets/global.gem.|

ruby-2.4.4 - #generating global wrappers.......

ruby-2.4.4 - #gemset created /Users/wofuminshengkeji/.rvm/gems/ruby-2.4.4

ruby-2.4.4 - #importing gemsetfile /Users/wofuminshengkeji/.rvm/gemsets/default.gems evaluated to empty gem list

ruby-2.4.4 - #generating default wrappers.......

ruby-2.4.4 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).

Install of ruby-2.4.4 - #complete

6.查看一下ruby版本：gem sources

*** CURRENT SOURCES ***

https://gems.ruby-china.org/

https://rubygems.org

7.在移除上面的镜像：gem sources --remove https://gems.ruby-china.org/

https://gems.ruby-china.org/ removed from sources

8.查看version: gem --version

9.安装pod ：sudo gem install cocoapods