iOS 安装 CocoaPods

1.替换ruby镜像

终端输入：$gem sources --remove https://rubygems.org/

然后添加国内最新镜像源（淘宝的Ruby镜像已经不更新了）

终端输入：$gem sources -a https://gems.ruby-china.com

执行完毕之后输入gem sources -l来查看当前镜像

2.安装 CocoaPods （安装到/usr/local/bin目录下）

终端输入：$ sudo gem install -n /usr/local/bin cocoapods

3.

$pod install --no-repo-update

$pod update --no-repo-update

可能出现的错误：

1.Unable to find a pod with name, author, summary, or description matching `AFNetworking`

在终端输入：    $cd ~/.cocoapods/repos

                          $git clone https://git.coding.net/CocoaPods/Specs.git

2.CDN: trunk URL couldn't be downloaded

    podfile文件中指定source源

    source 'https://github.com/CocoaPods/Specs.git'

     在终端输入：   pod repo remove trunk  (移除trunk源)