sudo gem install cocoapods

在使用IOS_BaiduSDK的时候，需要用到cocoapods，所以就需要按照步骤继续着。但是在过程中会遇到一些问题：

1. sudo gem install cocoapods 运行这个报错

 RubertdeMacBook-Pro:~ Rubert$ sudo gem install cocoapods
 /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0./universal-darwin14/rbconfig.rb:: warning: Insecure world writable dir /usr/local in PATH, mode
 ERROR:  Could not find a valid gem 'cocoapods' (>= ) in any repository

具体问题答案在这个地址里面找

http://blog.csdn.net/meegomeego/article/details/24005567

http://www.jianshu.com/p/6e5c0f78200a

2. 关于怎么在Podfile中添加 命令：

pod 'BaiduMapKit'

当我直接在项目目录下执行 touch Podfile 命令的时候，然后去目录下面找，并没有找到，然后我就用vi命令打开这个文件，粘贴

pod 'BaiduMapKit'，命令如下：

vi Podfile

按下i键，就可以输入了(i 好像是insert的意思)

好了就按esc键，之后就不能输入了。然后再按:wq回车即可。

3.关于安装多个xcode导致无法下载

 RubertdeMacBook-Pro:~ Rubert$ pod setup
 /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0./universal-darwin14/rbconfig.rb:: warning: Insecure world writable dir /usr/local in PATH, mode
 Setting up CocoaPods master repo
 [!] /usr/bin/git clone https://github.com/CocoaPods/Specs.git master --depth=1
 
 xcrun: error: active developer path ("/Applications/Xcode-beta.app/Contents/Developer") does not exist, use `xcode-select --switch path/to/Xcode.app` to specify the Xcode that you wish to use for command line developer tools (or see `man xcode-select`)

其实很简单，执行一条命令即可：

RubertdeMacBook-Pro:ChengDuHidengDangerManage Rubert$ sudo xcode-select -switch /Applications/Xcode-Beta-6.3.app