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如果你想在iOS程序中提供一仅在wifi网络下使用(Reeder)，或者在没有网络状态下提供离线模式(Evernote)。那么你会使用到Reachability来实现网络检测。　　写本文的目的　　了解Reachability都能做什么　　检测3中网络环境　　2G/3G 　　wifi 　　无网...

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