开发中的很多开源项目可以通过Pod导入自己的项目中,过程很简单，网上的博客说的天花乱坠的，简单描述一下过程，希望对有需要的人有帮助
1.创建spec文件
pod spec create FERefresh
创建之后的代码
<pre><code>#

Be sure to run `pod spec lint FERefresh.podspec' to ensure this is a

valid spec and to remove all comments including this before submitting the spec.

To learn more about Podspec attributes see http://docs.cocoapods.org/specification.html

To see working Podspecs in the CocoaPods repo see https://github.com/CocoaPods/Specs/

Pod::Spec.new do |s|

――― Spec Metadata ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――

These will help people to find your library, and whilst it

can feel like a chore to fill in it's definitely to your advantage. The

summary should be tweet-length, and the description more in depth.

s.name = "FERefresh"
s.version = "0.0.1"
s.summary = "A short description of FERefresh."

This description is used to generate tags and improve search results.

* Think: What does it do? Why did you write it? What is the focus?

* Try to keep it short, snappy and to the point.

* Write the description between the DESC delimiters below.

* Finally, don't worry about the indent, CocoaPods strips it!

s.description = <<-DESC
DESC

s.homepage = "http://EXAMPLE/FERefresh"

s.screenshots = "www.example.com/screenshots_1.gif", "www.example.com/screenshots_2.gif"

――― Spec License ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――

Licensing your code is important. See http://choosealicense.com for more info.

CocoaPods will detect a license file if there is a named LICENSE*

Popular ones are 'MIT', 'BSD' and 'Apache License, Version 2.0'.

s.license = "MIT (example)"

s.license = { :type => "MIT", :file => "FILE_LICENSE" }

――― Author Metadata ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――

Specify the authors of the library, with email addresses. Email addresses

of the authors are extracted from the SCM log. E.g. $ git log. CocoaPods also

accepts just a name if you'd rather not provide an email address.

Specify a social_media_url where others can refer to, for example a twitter

profile URL.

s.author = { "FlyElephant" => "1061731917@qq.com" }

Or just: s.author = "FlyElephant"

s.authors = { "FlyElephant" => "1061731917@qq.com" }

s.social_media_url = "http://twitter.com/FlyElephant"

――― Platform Specifics ―――――――――――――――――――――――――――――――――――――――――――――――――――――――

If this Pod runs only on iOS or OS X, then specify the platform and

the deployment target. You can optionally include the target after the platform.

s.platform = :ios

s.platform = :ios, "5.0"

When using multiple platforms

s.ios.deployment_target = "5.0"

s.osx.deployment_target = "10.7"

s.watchos.deployment_target = "2.0"

s.tvos.deployment_target = "9.0"

――― Source Location ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――

Specify the location from where the source should be retrieved.

Supports git, hg, bzr, svn and HTTP.

s.source = { :git => "http://EXAMPLE/FERefresh.git", :tag => "0.0.1" }

――― Source Code ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――

CocoaPods is smart about how it includes source code. For source files

giving a folder will include any swift, h, m, mm, c & cpp files.

For header files it will include any header in the folder.

Not including the public_header_files will make all headers public.

s.source_files = "Classes", "Classes/*/.{h,m}"
s.exclude_files = "Classes/Exclude"

s.public_header_files = "Classes/*/.h"

――― Resources ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――

A list of resources included with the Pod. These are copied into the

target bundle with a build phase script. Anything else will be cleaned.

You can preserve files from being cleaned, please don't preserve

non-essential files like tests, examples and documentation.

s.resource = "icon.png"

s.resources = "Resources/*.png"

s.preserve_paths = "FilesToSave", "MoreFilesToSave"

――― Project Linking ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――

Link your library with frameworks, or libraries. Libraries do not include

the lib prefix of their name.

s.framework = "SomeFramework"

s.frameworks = "SomeFramework", "AnotherFramework"

s.library = "iconv"

s.libraries = "iconv", "xml2"

――― Project Settings ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――

If your library depends on compiler flags you can set them in the xcconfig hash

where they will only apply to your library. If you depend on other Podspecs

you can include multiple dependencies to ensure it works.

s.requires_arc = true

s.xcconfig = { "HEADER_SEARCH_PATHS" => "$(SDKROOT)/usr/include/libxml2" }

s.dependency "JSONKit", "~> 1.4"

end`</code></pre>

2.修改FERefresh.podspec文件:
<pre><code>
`Pod::Spec.new do |s|

s.name = "FERefresh"

s.version = "0.8.0"

s.summary = "Header and Footer Refresh for UIScrollView in iOS."

s.homepage = "https://github.com/SmallElephant/FERefresh"

s.license = "MIT"

s.author = { "FlyElephant" => "sfmkeso@163.com" }

s.social_media_url = "http://www.jianshu.com/users/24da48b2ddb3/latest_articles"

s.platform = :ios, "7.0"

s.source = { :git => "https://github.com/SmallElephant/FERefresh.git", :tag => "0.8.0" }

s.source_files ="FERefresh/utils/*.{h,m}"

s.frameworks = "UIKit"

s.requires_arc = true

s.xcconfig = { "HEADER_SEARCH_PATHS" => "$(SDKROOT)/usr/include/libxml2" }

end`</code></pre>

3.编译FERefresh.podspec文件
pod lint spec FERefresh.podspec
4.编译没有警告和错误之后注册CocoaPods:
pod trunk register email 'UserName' --description='macbook pro'
邮箱验证邮件，查看session:
pod trunk me
5.推送到CocoaPods
pod trunk push FERefresh.podspec

完成以上工作，你可以在你的项目的Podfile导入FERefresh第三方类库了~