检索关键词：2019 CocoaPods使用
查看版本：gem --version
输出： 2.7.7
更换Ruby 源：
gem sources --remove https://rubygems.org/
gem sources --add https://gems.ruby-china.com/
淘宝的源好像不能用了用这个：https://gems.ruby-china.com/
安装cocoapods: sudo gem install cocoapods
报错：
ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions for the /usr/bin directory.
输入： sudo gem install -n /usr/local/bin cocoapods
输出：
Successfully installed httpclient-2.8.3 Fetching: algoliasearch-1.27.1.gem (100%) Successfully installed algoliasearch-1.27.1 Fetching: cocoapods-core-1.8.4.gem (100%) Successfully installed cocoapods-core-1.8.4 Fetching: cocoapods-deintegrate-1.0.4.gem (100%) Successfully installed cocoapods-deintegrate-1.0.4 Fetching: cocoapods-downloader-1.3.0.gem (100%) Successfully installed cocoapods-downloader-1.3.0 Fetching: cocoapods-trunk-1.4.1.gem (100%) Successfully installed cocoapods-trunk-1.4.1 Fetching: molinillo-0.6.6.gem (100%) Successfully installed molinillo-0.6.6 Fetching: atomos-0.1.3.gem (100%) Successfully installed atomos-0.1.3 Fetching: xcodeproj-1.13.0.gem (100%) Successfully installed xcodeproj-1.13.0 Fetching: fourflusher-2.3.1.gem (100%) Successfully installed fourflusher-2.3.1 Fetching: ruby-macho-1.4.0.gem (100%) Successfully installed ruby-macho-1.4.0 Fetching: cocoapods-1.8.4.gem (100%) Successfully installed cocoapods-1.8.4 Parsing documentation for httpclient-2.8.3 Installing ri documentation for httpclient-2.8.3 Parsing documentation for algoliasearch-1.27.1 Installing ri documentation for algoliasearch-1.27.1 Parsing documentation for cocoapods-core-1.8.4 Installing ri documentation for cocoapods-core-1.8.4 Parsing documentation for cocoapods-deintegrate-1.0.4 Installing ri documentation for cocoapods-deintegrate-1.0.4 Parsing documentation for cocoapods-downloader-1.3.0 Installing ri documentation for cocoapods-downloader-1.3.0 Parsing documentation for cocoapods-trunk-1.4.1 Installing ri documentation for cocoapods-trunk-1.4.1 Parsing documentation for molinillo-0.6.6 Installing ri documentation for molinillo-0.6.6 Parsing documentation for atomos-0.1.3 Installing ri documentation for atomos-0.1.3 Parsing documentation for xcodeproj-1.13.0 Installing ri documentation for xcodeproj-1.13.0 Parsing documentation for fourflusher-2.3.1 Installing ri documentation for fourflusher-2.3.1 Parsing documentation for ruby-macho-1.4.0 Installing ri documentation for ruby-macho-1.4.0 Parsing documentation for cocoapods-1.8.4 Installing ri documentation for cocoapods-1.8.4 Done installing documentation for httpclient, algoliasearch, cocoapods-core, cocoapods-deintegrate, cocoapods-downloader, cocoapods-trunk, molinillo, atomos, xcodeproj, fourflusher, ruby-macho, cocoapods after 13 seconds 12 gems installed
查看pod版本：pod --version
输出：1.8.4
cd到项目目录，
创建podfile: touch Podfile，
在podfile填入内容：
source 'https://github.com/CocoaPods/Specs.git' platform :ios, '8.0' target 'test' do pod 'SDWebImage' end
安装SDWebImage： pod install，注意，podfile里面的注释不是//，双斜线pod install会报错
pod install 报错：
CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/1/1/7/SDWebImage/5.4.0/SDWebImage.podspec.json, error: Failed to open TCP connection to raw.githubusercontent.com:443 (Connection refused - connect(2) for "raw.githubusercontent.com" port 443)
在podfile最上面添加 source 'https://github.com/CocoaPods/Specs.git'：
source 'https://github.com/CocoaPods/Specs.git' platform :ios, '8.0' target 'test' do pod 'SDWebImage' end
再次 pod install, 报错：
[!] CocoaPods could not find compatible versions for pod "SDWebImage": In Podfile: SDWebImage (~> 5.0) None of your spec sources contain a spec satisfying the dependency: `SDWebImage (~> 5.0)`. You have either: * out-of-date source repos which you can update with `pod repo update` or with `pod install --repo-update`. * mistyped the name or version. * not added the source repo that hosts the Podspec to your Podfile.
修改pod file,去掉sdwebimage指定的版本号：
pod 'SDWebImage'
然后pod install
安装成功，重启xcode,运行OK