CDN: trunk Repo update failed

前言

自从CocoaPods升级到1.8后，就把CDN切换为默认的spec repo源，导致最近使用pod update会出现以下情况

[!] 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

但cdn因为q的原因，导致一直连不上

解决办法

1. podfile文件中指定source源：

source 'https://github.com/CocoaPods/Specs.git'

或者指定为国家不错的镜像站【推荐】

source 'https://mirrors.tuna.tsinghua.edu.cn/git/CocoaPods/Specs.git'

2. 删除trunk源

pod repo remove trunk

其他

另外推荐CocoaPods 镜像，由于https://github.com/CocoaPods/Specs.git日益庞大，进行一次pod setup，国内几十K/s的速度，几乎耗费几小时才能安装完毕，所以推荐从CocoaPods镜像进行clone

$ cd ~/.cocoapods/repos 
$ pod repo remove master
$ git clone https://mirrors.tuna.tsinghua.edu.cn/git/CocoaPods/Specs.git master

参考：
https://juejin.im/post/5dce6dc4e51d453d63662718
https://www.jianshu.com/p/bf1cbe49cb5d