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
1 RubertdeMacBook-Pro:~ Rubert$ sudo gem install cocoapods 2 /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/universal-darwin14/rbconfig.rb:213: warning: Insecure world writable dir /usr/local in PATH, mode 040777 3 ERROR: Could not find a valid gem 'cocoapods' (>= 0) 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
1 RubertdeMacBook-Pro:~ Rubert$ pod setup 2 /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/universal-darwin14/rbconfig.rb:213: warning: Insecure world writable dir /usr/local in PATH, mode 040777 3 Setting up CocoaPods master repo 4 [!] /usr/bin/git clone https://github.com/CocoaPods/Specs.git master --depth=1 5 6 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
