1、[!] ERROR: Parsing unable to continue due to parsing error: contained in the file located at xxx/xxx.lock
解决方法： 删除lock文件和pods文件夹，再重新pod install
2、重装cocoapods无法搜索三方库，提示：
[!] Unable to find a pod with name, author, summary, or description matching `afn`
解决方法：删除搜索索引:
rm ~/Library/Caches/CocoaPods/search_index.json