podfile升級之後到最新版本(1.0.0)，pod裏的內容必須明確指出所用第三方庫的target，否則會出現如下錯誤
![the <wbr>dependency <wbr>`React` <wbr>is <wbr>not <wbr>used <wbr>in <wbr>any <wbr>concrete <wbr>]( "the <wbr>dependency <wbr>`React` <wbr>is <wbr>not <wbr>used <wbr>in <wbr>any <wbr>concrete <wbr>")
解決方案是在podfile裏面指定工程，podfile文件示例
platform :ios, ‘7.0‘
target "RWTFlickrSearch" do
pod ‘ReactiveCocoa‘, ‘2.1.8‘
pod ‘objectiveflickr‘, ‘2.0.4‘
pod ‘LinqToObjectiveC‘, ‘2.0.0‘
pod ‘SDWebImage‘, ‘3.6‘
end
再次運行pod install就成功啦