CocoaPods使用步驟(已有Ruby環境):
(沒有Ruby環境也沒關係,後面會安裝升級的,或者翻我之前安裝Ruby環境文章也行)
（注：為提示作用，不要在終端中輸入）1.打開終端,輸入 gem sources –remove https://rubygems.org/

為了驗證你的Ruby映象是並且僅是taobao，可以用以下命令檢視：
$ gem sources -l

只有在終端中出現下面文字才表明你上面的命令是成功的：

* CURRENT SOURCES *

1.5升級gem命令：$ sudo gem update –system

2.安裝CocoaPods,在終端輸入
$ sudo gem install cocoapods
這裡出現問題了.安裝不了,

下面是解決方法:
這個地方很坑，之前安裝cocoapods一直是沒有這個問題的，這裡提示Ruby版本要大於或等於2.2.2
於是檢視ruby版本
$ruby -v

ruby 2.0.0p648 (2015-12-16 revision 53162) [universal.x86_64-darwin15]
果然這裡就要升級Ruby版本啦
檢視目前的所有ruby版本：
$rvm list known

如果提示command not found 請先安裝rvm
（
在Mac上安裝好ruby的RVM後，
在終端輸入時，出現rvm: command not found，經過OverStackFlow上的查詢，
發現瞭解決辦法：rvm: command not found MAC OX
可能是因為ram的shell配置沒有載入，在終端輸入：
$ source ~/.rvm/scripts/rvm

接著輸入：
$ type rvm | head -n 1

如果輸出是rvm is a function，
則需要將source ~/.rvm/scripts/rvm新增到~/.bash_profile檔案中。
$Sudo vi ~/.bash_profile

則需要將source ~/.rvm/scripts/rvm新增到~/.bash_profile檔案中。 然後儲存退出 $esc：wq

}
如果有ruby版本則不需要這行（$curl -L get.rvm.io | bash -s stable ）
如果已安裝會列出所有的ruby版本：

MRI Rubies

[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-head] # security released on head
[ruby-]1.9.1[-p431]
[ruby-]1.9.2[-p330]
[ruby-]1.9.3[-p551]
[ruby-]2.0.0[-p648]
[ruby-]2.1[.8]
[ruby-]2.2[.4]
[ruby-]2.3[.0]
[ruby-]2.2-head
ruby-head

JRuby

jruby-1.6[.8]
jruby-1.7[.23]
jruby[-9.0.5.0]
jruby-head

Rubinius

rbx-1[.4.3]
rbx-2.3[.0]
rbx-2.4[.1]
rbx[-2.5.8]
rbx-head

Opal

opal

Minimalistic ruby implementation - ISO 30170:2012

mruby[-head]

Ruby Enterprise Edition

ree-1.8.6
ree[-1.8.7][-2012.02]

GoRuby

goruby

Topaz

topaz

MagLev

maglev[-head]
maglev-1.0.0

Mac OS X Snow Leopard Or Newer

macruby-0.10
macruby-0.11
macruby[-0.12]
macruby-nightly
macruby-head

IronRuby

ironruby[-1.1.3]

ironruby-head

這裡我們安裝2.2.2:

$rvm install 2.2.2

終端執行結果：（如果直接成功請繞過homebrew的解除安裝安裝）

Searching for binary rubies, this might take some time.

Checking requirements for osx.

About to install Homebrew, press Enter for default installation in /usr/local,

type new path if you wish custom Homebrew installation (the path needs to be writable for user)

回車：
It appears Homebrew is already installed. If your intent is to reinstall you
should do the following before running this installer again:
ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)”
The current contents of /usr/local are .git
Requirements installation failed with status: 1.
這裡執行：

(下面是解除安裝Home_brew的

)

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

解除安裝home-brew
Warning: This script will remove:
/Library/Caches/Homebrew/
/usr/local/.git/
Are you sure you want to uninstall Homebrew? [y/N] y
==> Removing Homebrew installation…
==> Removing empty directories…
==> Homebrew uninstalled!
You may want to restore /usr/local’s original permissions
sudo chmod 0755 /usr/local
sudo chgrp wheel /usr/local
再執行：
$ rvm install 2.2.2

提示：

Searching for binary rubies, this might take some time.

Checking requirements for osx.

About to install Homebrew, press Enter for default installation in /usr/local,

type new path if you wish custom Homebrew installation (the path needs to be writable for user)

按回車：
==> This script will install:
/usr/local/bin/brew
/usr/local/Library/…
/usr/local/share/doc/homebrew
/usr/local/share/man/man1/brew.1
/usr/local/share/zsh/site-functions/_brew
/usr/local/etc/bash_completion.d/brew

Press RETURN to continue or any other key to abort
==> /usr/bin/sudo /bin/mkdir /Library/Caches/Homebrew
Password:
這裡需要輸入電腦密碼：
==> /usr/bin/sudo /bin/chmod g+rwx /Library/Caches/Homebrew
==> /usr/bin/sudo /usr/sbin/chown haha /Library/Caches/Homebrew
==> Downloading and installing Homebrew…
remote: Counting objects: 501, done.
remote: Compressing objects: 100% (445/445), done.
remote: Total 501 (delta 29), reused 360 (delta 27), pack-reused 0
Receiving objects: 100% (501/501), 787.83 KiB | 169.00 KiB/s, done.
Resolving deltas: 100% (29/29), done.
From https://github.com/Homebrew/brew
* [new branch] master -> origin/master
HEAD is now at 32f7e73 download_strategy: ensure fixed commit hash length
==> Tapping homebrew/core
Cloning into ‘/usr/local/Library/Taps/homebrew/homebrew-core’…
remote: Counting objects: 3714, done.
remote: Compressing objects: 100% (3598/3598), done.
remote: Total 3714 (delta 14), reused 2112 (delta 6), pack-reused 0
Receiving objects: 100% (3714/3714), 2.88 MiB | 240.00 KiB/s, done.
Resolving deltas: 100% (14/14), done.
Checking connectivity… done.
Checking out files: 100% (3717/3717), done.
Tapped 3591 formulae (3,740 files, 9.0M)
==> Installation successful!
==> Next steps
Run brew help to get started
Further documentation: https://git.io/brew-docs
==> Homebrew has enabled anonymous aggregate user behaviour analytics
Read the analytics documentation (and how to opt-out) here:
https://git.io/brew-analytics
Installing requirements for osx.
Updating system…..
Installing required packages: autoconf, automake, libtool, pkg-config, libyaml, readline, libksba, openssl……..
Certificates in ‘/usr/local/etc/openssl/cert.pem’ are already up to date.
Requirements installation successful.
ruby-2.2.2 - #configure
ruby-2.2.2 - #download
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 6854k 100 6854k 0 0 61342 0 0:01:54 0:01:54 –:–:– 132k
ruby-2.2.2 - #validate archive
ruby-2.2.2 - #extract
ruby-2.2.2 - #validate binary
ruby-2.2.2 - #setup
ruby-2.2.2 - #gemset created /Users/haha/.rvm/gems/[email protected]
ruby-2.2.2 - #importing gemset /Users/haha/.rvm/gemsets/global.gems…………………………
ruby-2.2.2 - #generating global wrappers……..
ruby-2.2.2 - #gemset created /Users/haha/.rvm/gems/ruby-2.2.2
ruby-2.2.2 - #importing gemsetfile /Users/haha/.rvm/gemsets/default.gems evaluated to empty gem list
ruby-2.2.2 - #generating default wrappers……..
Updating certificates in ‘/etc/openssl/cert.pem’.
mkdir: /etc/openssl: Permission denied
mkdir -p “/etc/openssl” failed, retrying with sudo
haha password required for ‘mkdir -p /etc/openssl’:
and sudo mkdir worked
這樣ruby2.2.2就安裝好了
現在就可以安裝cocoapods啦：
$sudo gem install cocoapods
看看這樣cocoapods就安裝成功了
Fetching: nap-1.1.0.gem (100%)
Successfully installed nap-1.1.0
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Fetching: cocoapods-try-1.0.0.gem (100%)
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Successfully installed cocoapods-1.0.1
Parsing documentation for nap-1.1.0
Installing ri documentation for nap-1.1.0
Parsing documentation for fourflusher-0.3.2
Installing ri documentation for fourflusher-0.3.2
Parsing documentation for escape-0.0.4
Installing ri documentation for escape-0.0.4
Parsing documentation for colored-1.2
Installing ri documentation for colored-1.2
Parsing documentation for concurrent-ruby-1.0.2
Installing ri documentation for concurrent-ruby-1.0.2
Parsing documentation for thread_safe-0.3.5
Installing ri documentation for thread_safe-0.3.5
Parsing documentation for tzinfo-1.2.2
Installing ri documentation for tzinfo-1.2.2
Parsing documentation for i18n-0.7.0
Installing ri documentation for i18n-0.7.0
Parsing documentation for activesupport-5.0.0
Installing ri documentation for activesupport-5.0.0
Parsing documentation for claide-1.0.0
Installing ri documentation for claide-1.0.0
Parsing documentation for xcodeproj-1.1.0
Installing ri documentation for xcodeproj-1.1.0
Parsing documentation for molinillo-0.4.5
Installing ri documentation for molinillo-0.4.5
Parsing documentation for cocoapods-try-1.0.0
Installing ri documentation for cocoapods-try-1.0.0
Parsing documentation for netrc-0.7.8
Installing ri documentation for netrc-0.7.8
Parsing documentation for cocoapods-trunk-1.0.0
Installing ri documentation for cocoapods-trunk-1.0.0
Parsing documentation for cocoapods-stats-1.0.0
Installing ri documentation for cocoapods-stats-1.0.0
Parsing documentation for cocoapods-search-1.0.0
Installing ri documentation for cocoapods-search-1.0.0
Parsing documentation for cocoapods-plugins-1.0.0
Installing ri documentation for cocoapods-plugins-1.0.0
Parsing documentation for cocoapods-downloader-1.0.1
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Parsing documentation for cocoapods-deintegrate-1.0.0
Installing ri documentation for cocoapods-deintegrate-1.0.0
Parsing documentation for fuzzy_match-2.0.4
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Installing ri documentation for cocoapods-core-1.0.1
Parsing documentation for cocoapods-1.0.1
Installing ri documentation for cocoapods-1.0.1
Done installing documentation for nap, fourflusher, escape, colored, concurrent-ruby, thread_safe, tzinfo, i18n, activesupport, claide, xcodeproj, molinillo, cocoapods-try, netrc, cocoapods-trunk, cocoapods-stats, cocoapods-search, cocoapods-plugins, cocoapods-downloader, cocoapods-deintegrate, fuzzy_match, cocoapods-core, cocoapods after 146 seconds
23 gems installed

5.現在建一個工程,叫CocoaPodsDemo

6.CocoaPods的工作原理是利用Podfile檔案來下載我們指定的類庫,每個工程只需要一個Podfile檔案,但Podfile檔案需要我們利用終端自行建立

7.在終端中使用cd命令進入工程所在目錄,例如:
$ cd /Users/lanouhn/Desktop/Shared/CocoaPods

8.當前目錄下,利用vim建立Podfile,在終端中輸入:
$ vim Podfile

9.按【i】或【a】進入插入模式,輸入以下內容:
原因是podfile升級到最新版本，pod裡的內容必須明確指出所用第三方庫的target；可以修改Podfile檔案的配置檔案，讓它相容不指定固定版本；且又不報錯；

platform :ios, ‘7.0’
target ‘CocoaPodsDemo’ do
pod ‘AFNetworking’, ‘~> 2.4.1’
end

其中CocoaPodsDemo要換成當前target名，最後不要忘記增加一個end結尾,

(這兩行內容是在AFNetworking的github頁面找到的。
這兩句文字的意思是，當前AFNetworking支援的iOS最高版本是iOS 7.0, 要下載的AFNetworking版本是2.0)

輸入完畢後,按【ESC】返回命令列模式
按【:】(冒號)進入末行模式,輸入【wq】儲存命令並退出vim

10.這時你會發現工程目錄中，出現一個名為Podfile的檔案，而且檔案內容就是剛剛輸入的內容。
(注意,Podfile檔案應該和工程檔案.xcodeproj在同一個目錄下)

此時就可以利用CocoPods下載AFNetworking類庫了,還是在終端中的當前工程目錄下，執行以下命令:
$ pod install
(個人猜測,執行該命令後,CocoPods自動會找到該目錄下的Podfile檔案,下載檔案內容對應的第三方類庫)
[ps.最近使用CocoaPods來新增第三方類庫，無論是執行pod install還是pod update都卡在了Analyzing dependencies不動
原因在於當執行以上兩個命令的時候會升級CocoaPods的spec倉庫，加一個引數可以省略這一步，然後速度就會提升不少。

加引數的命令如下：
pod install –verbose –no-repo-update
pod update –verbose –no-repo-update
或者 pod update 以及 pod install 也可以

11.執行完畢後,終端會出現以下資訊:
EricmatoMacBook-Pro:CocoaPodsDemo ericwang$ pod install
Analyzing dependencies
Downloading dependencies
Installing AFNetworking (2.0.2)
Generating Pods project
Integrating client project

[!] From now on use CocoaPodsDemo.xcworkspace.

(注意最後一句話，意思是:以後開啟工程就用 CocoaPodsDemo.xcworkspace 開啟,而不是之前的.xcodeproj檔案)

12.此時工程目錄會多一個.xcworkspace檔案,一個“Podfile.lock”檔案和一個資料夾“Pods”

13.點選 .xcworkspace 開啟工程,你會發現,AFNetwoking已經成功匯入專案了

現在，你就可以開始使用AFNetworking.h了。
可以稍微測試一下，在你的專案任意程式碼檔案中輸入(貌似不提示):

import

import “AFNetworking.h”

然後編譯，看看是否出錯
*/
/*
提示我們從現在起，我們需要使用CocoaPodsTest.xcworkspace檔案來開發。

對於工程發生的變化，有幾點需要說明：

第三方庫會被編譯成靜態庫供我們真正的工程使用

CocoaPods會將所有的第三方庫以target的方式組成一個名為Pods的工程，該工程就放在剛才新生成的Pods目錄下。整個第三方庫工程會生成一個名稱為libPods.a的靜態庫提供給我們自己的CocoaPodsTest工程使用。

我們的工程和第三方庫所在的工程會由一個新生成的workspace管理

為了方便我們直觀的管理工程和第三方庫，CocoaPodsTest工程和Pods工程會被以workspace的形式組織和管理，也就是我們剛才看到的CocoaPodsTest.xcworkspace檔案。

原來的工程設定已經被更改了，這時候我們直接開啟原來的工程檔案去編譯就會報錯，只能使用新生成的workspace來進行專案管理。\

pod –verson 查詢當前版本
這是系統重灌之後今天安裝的方法,安裝不到一個小時就搞好了,上一次安裝都被坑了,
坑人的格式,有一些顯示的和我寫的不一樣.太噁心了