內(nèi)容提要：
podfile升級之后到最新版本，pod里的內(nèi)容必須明確指出所用第三方庫的target，否則會出現(xiàn)The dependency `` is not used in any concrete target這樣的錯誤。
以下從三個步驟陳述：
1. Podfile升級
查看pod版本：
pod --version
pod 升級（此時是升級到1.0.0.beta.2版本）：
sudo gem install cocoapods --pre
2. 錯誤內(nèi)容：
我的Podfile的內(nèi)容是：
platform :ios, '7.0'
pod 'ReactiveCocoa', '2.1.8'
pod 'objectiveflickr', '2.0.4'
pod 'LinqToObjectiveC', '2.0.0'
pod 'SDWebImage', '3.6'
pod install后出現(xiàn)錯誤The dependency `` is not used in any concrete target
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pod install
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/universal-darwin14/rbconfig.rb:213: warning: Insecure world writable dir /Applications/Cocos/tools/ant/bin in PATH, mode 040777
Re-creating CocoaPods due to major version update.
Updating local specs repositories
Analyzing dependencies
[!] The dependency `ReactiveCocoa (= 2.1.8)` is not used in any concrete target.
The dependency `objectiveflickr (= 2.0.4)` is not used in any concrete target.
The dependency `LinqToObjectiveC (= 2.0.0)` is not used in any concrete target.
The dependency `SDWebImage (= 3.6)` is not used in any concrete target.
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3. 修改方法：
Podfile內(nèi)容更改：
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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
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這樣再運行pod install，就會成功了。
