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在 https://github.com/ReactiveCocoa/ReactiveCocoa 下载
github 上方法：
To add RAC to your application:
1.Add the ReactiveCocoa repository as a submodule of your application ’ s repository.
2.Run script/bootstrap from within the ReactiveCocoa folder.
3.Drag and drop ReactiveCocoa.xcodeproj, Carthage/Checkouts/Box/Box.xcodeproj and Carthage/Checkouts/Result/Result.xcodeproj into your application ’ s Xcode project or workspace.
4.On the “ General ” tab of your application target ’ s settings, add ReactiveCocoa.framework, Box.framework and Result.framework to the “ Embedded Binaries ” section.
5.If your application target does not contain Swift code at all, you should also set the EMBEDDED_CONTENT_CONTAINS_SWIFT build setting to “ Yes ”.
关于第 1 步首先你得有个 git ，给自己的工程创建一个 git
$ git init
$ git submodule add https://github.com/ReactiveCocoa/ReactiveCocoa.git external/ReactiveCocoa
$ git add .gitmodules external/ReactiveCocoa
$ git commit -m "Add ReactiveCocoa as a submodule"
后续补充使用 cocoaPods 添加
关于 ReactiveCocoa 入门两个教程：
1. http://benbeng.leanote.com/post/ReactiveCocoaTutorial-part1
2. http://benbeng.leanote.com/post/ReactiveCocoaTutorial-part2
这样好用的 ReactiveCocoa ，根本停不下来：
http://www.cocoachina.com/ios/20150817/13071.html
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