输入pod install之后出现:
[!] CocoaPods was not able to update the `master` repo. If this is an unexpected issue and persists you can inspect it running `pod repo update --verbose`
解决方法：清除CocoaPods缓存后重新执行pod install, 命令如下：
sudo rm -fr ~/.cocoapods/repos/master
pod install[!] CocoaPods was not able to update the `master` repo...
原文：http://www.cnblogs.com/Rinpe/p/5057986.html