The `master` repo requires CocoaPods 1.0.0 - (currently using 0.39.0) 解决方法：sudo gem install -n /usr/local/bin cocoapods –pre

 The `master` repo requires CocoaPods 1.0.0 -  (currently using 0.39.0)
解决方法：sudo gem install -n /usr/local/bin cocoapods –pre

While executing gem ... (Gem::DependencyError)
    Unable to resolve dependencies: cocoapods requires cocoapods-core

解决方法：sudo gem update --system

Unable to find a specification for `xxxxx`

解决方法：pod repo remove master         然后pod setup

install或者update 一直卡在Updating local specs repositories

解决方法：pod install --verbose --no-repo-update pod update --verbose --no-repo-update

卡在不动Setting up CocoaPods master repo

解决方法：gem sources --remove https://ruby.taobao.org/

                gem sources --add https://gems.ruby-china.org/

                gem sources -l

The dependency `SDWebImage (~> 3.8)` is not used in any concrete target

解决方法：

target 'MyApp' do
  pod 'SDWebImage', '~> 3.8'
end

目前就这么多，以后有遇到新的会继续补充