CocoaPods安装失败
CocoaPods安装东西的时候它要找到Xcode的Developer文件夹, 如果找不到会报如下错误
解决方案
gaoshuai替换为你自己的用户名 ```objc
sudo xcode-select --switch /Users/gaoshuai/Applications/Xcode.app/Contents/Developer ```
CocoaPods安装过程
最近在安装SASS的时候，用到gem命令，但是运行出行如下错误！
C:\Users\len>gem install sass
ERROR: While executinggem ... (Gem::RemoteFetcher::FetchError)
Errno::ETIMEDOUT: A connection attempt failed because the connected partydi
d not properly respond after a period of time, or established connectionfailed
because connected host has failed to respond. - connect(2) for "rubygems.global.
ssl.fastly.net" port 443 (https://api.rubygems.org/quick/Marshal.4.8/sass-3.4.13
.gemspec.rz)
原因是ruby 的gem被和谐了，现在淘宝的ruby工程师架设了rubygems的国内镜像。使用方法如下：
$ gem sources --remove https://rubygems.org/
$ gem sources -a https://ruby.taobao.org/
$ gem sources -l
*** CURRENT SOURCES ***
https://ruby.taobao.org
Xcode7.0以前
+ 更新ruby的软件源
* gem sources --remove https://rubygems.org/
* gem sources -a http://ruby.taobao.org/
* gem sources -l
Xcode7.0以后
+ 更新ruby的软件源
* gem sources --remove https://rubygems.org/
* gem sources -a https://ruby.taobao.org/
* gem sources -l
+ 安装CocoaPods
* sudo gem install cocoapods
+ 替换CocoaPods的镜像索引
* pod repo remove master
* pod repo add master http://git.oschina.net/akuandev/Specs.git
* pod repo add master https://gitcafe.com/akuandev/Specs.git
* pod repo update
+ 设置 pod 仓库
* pod setup
+ 测试
* pod --version
- 卸载CocoaPods
+ sudo gem uninstall cocoapods
- CocoaPods使用:
+ 使用时需要新建一个名为Podfile的文件
+ 将依赖的库名字依次列在文件中
```
platform:ios
pod'AFNetworking'
```
- 注释事项
+ 1.利用CocoPods管理类库后, 以后打开项目就用xxxx.xcworkspace 打开,而不是之前的.xcodeproj文件
+ 2.每次更改了Podfile文件,你需要重新执行一次pod update命令。
+ 3.CocoaPods在执行pod install和pod update时,会默认先更新一次CocoPods的 spec仓库索引。使用--no-repo-update参数可以禁止其做索引更新操作
```
podinstall --no-repo-update
podupdate --no-repo-update
```