[!] CDN: trunk - Cannot perform full-text search because Algolia returned an error: 0: Cannot reach any host: execution expired, execution expired, execution expired, execution expired
解決辦法：
1. podfile文件中指定source源為master：
source 'https://github.com/CocoaPods/Specs.git'
2.終端執行$ pod repo remove trunk移除trunk源
執行完后，$ pod search XXX 就都正常了！
注意：podfile文件中一定要指定master源，因為現在默認是trunk源
[!] CDN: trunk Repo update failed - 17 error(s): CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/1/d/4/CocoaAsyncSocket/0.0.1/CocoaAsyncSocket.podspec.json, error: Operation timed out - SSL_connect ...
也可以用以上的方法解決