https://www.jianshu.com/p/bf1cbe49cb5d
由於項目是用CocoaPods管理，CocoaPods 1.8將CDN切換為默認的spec repo源，並附帶一些增強功能！CDN支持最初是在1.7版本中引入的，最終在1.7.2中完成。 它旨在大大加快初始設置和依賴性分析。
目前項目使用pods的是1.8.4版本
Ribers-Mac:ZNB_Country2.0 Riber$ pod --version 1.8.4 最近使用pods，卻出現了一下錯誤！
[!] 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 ... 按照官方文檔 podfile文件中添加source源：source 'https://github.com/CocoaPods/Specs.git'
podfile文件中添加source源后，pod install和pod update可以正常操作，但是pod search有些庫卻不正常。
Ribers-Mac:ZNB_Country2.0 Riber$ pod search mj [!] CDN: trunk Repo update failed - 3 error(s): CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/0/f/b/MJRefresh/0.0.1/MJRefresh.podspec.json, error: Operation timed out - SSL_connect CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/0/f/b/MJRefresh/1.4.4/MJRefresh.podspec.json, error: Operation timed out - SSL_connect CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/0/f/b/MJRefresh/2.4.9/MJRefresh.podspec.json, error: Operation timed out - SSL_connect Ribers-Mac:ZNB_Country2.0 Riber$ pod search rbtitle -> RBTitleView (2.0.1) 簡單實用的titleView pod 'RBTitleView', '~> 2.0.1' - Homepage: https://github.com/RiberWang/RBTitleDemo - Source: https://github.com/RiberWang/RBTitleDemo.git - Versions: 2.0.1, 1.0.1, 1.0.0 [master repo] 解決辦法：
1. podfile文件中指定source源為master：
source 'https://github.com/CocoaPods/Specs.git'
2.執行pod repo remove trunk移除trunk源
執行完后，pod search就都正常了！
Ribers-Mac:ZNB_Country2.0 Riber$ pod repo list master - Type: git (master) - URL: https://github.com/CocoaPods/Specs.git - Path: /Users/Riber/.cocoapods/repos/master trunk - Type: CDN - URL: https://cdn.cocoapods.org/ - Path: /Users/Riber/.cocoapods/repos/trunk 2 repos Ribers-Mac:ZNB_Country2.0 Riber$ pod repo remove trunk Removing spec repo `trunk` 注意：podfile文件中一定要指定master源，因為現在默認是trunk源
source 'https://github.com/CocoaPods/Specs.git'
參考文章：
- 官方說明（英語不好的同志可在谷歌瀏覽器中打開使用其翻譯功能）
- Github Issules
作者：RiberWang
鏈接：https://www.jianshu.com/p/bf1cbe49cb5d
來源：簡書
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