安装CocoaPods必须先安装Ruby环境
一：升级Ruby环境
gem update --system
二：更换Ruby镜像
gem sources -a https://gems.ruby-china.com/
gem sources -a https://gems.ruby-china.org/ #已不可用
检查镜像，出现下图，ruby镜像安装成功。
gem sources -l
三：安装CocoaPods
sudo gem install -n /usr/local/bin cocoapods
出现报错如下，说明ruby环境版本低
ERROR: Error installing cocoapods:
ERROR: Failed to build gem native extension.
我的当前是：2.3.7，更新至2.6，如下图
rvm install ruby-2.6
设置ruby2.6为默认镜像，再次安装cocoapods即可
rvm use ruby-2.6.5
rvm --default use 2.6.5
platform :ios, '9.0'
source 'https://mirrors.tuna.tsinghua.edu.cn/git/CocoaPods/Specs.git'
use_frameworks!
target '项目名' do
pod 'AFNetworking','~> 4.0.1'
pod 'SVProgressHUD', '~> 2.2.5'
pod 'JSONModel'
pod 'MJRefresh'
pod 'SDWebImage'
pod 'HBDNavigationBar'
pod 'MBProgressHUD', '~> 1.1.0'
pod 'DateTools'
pod 'WZLBadge'
pod 'Masonry'
pod 'MJExtension'
pod 'RTRootNavigationController'
pod 'CRBoxInputView'
pod 'SDCycleScrollView','>= 1.80'
pod 'CWLateralSlide'
pod 'FMDB'
# pod 'Bugly'
pod 'YYModel'
pod 'YYKit'
end
