CocoaPods报错：The dependency `AFNetworking ` is not used in any concrete target

ex:

The dependency `` is not used in any concrete target
The dependency `AFNetworking ` is not used in any concrete target

• CocoaPods再遇困难，前几天电脑重装了系统，所有的开发工具就都装了最新的，当我用CocoaPods的时候，出了一个提示，大概就是我的版本不是 last version，然后给你提示了一个命令，直接复制即可，就是下面这个：

sudo gem install cocoapods --pre

安装cocoapods的预览版本，就会更新下来新的1.0.0.beta.2版本，如下所示：

Successfully installed cocoapods-1.0.0.beta.2
Parsing documentation for cocoapods-1.0.0.beta.2

很高兴啊，更新了新的版本，然而pod install就出错了，悲了个剧！出错如下：

Updating local specs repositories
Analyzing dependencies
[!] The dependency `FMDB (~> 2.3)` is not used in any concrete target.
The dependency `SDWebImage (~> 3.6)` is not used in any concrete target.
The dependency `AFNetworking (~> 2.3.0)` is not used in any concrete target.
The dependency `DACircularProgress (~> 2.2.0)` is not used in any concrete target.
The dependency `MBProgressHUD (~> 0.8)` is not used in any concrete target.
The dependency `PSTCollectionView (~> 1.2.1)` is not used in any concrete target.
The dependency `HPGrowingTextView (~> 1.1)` is not used in any concrete target.
The dependency `ProtocolBuffers (= 1.9.3)` is not used in any concrete target.
The dependency `leveldb-library (~> 1.18.1)` is not used in any concrete target.
The dependency `SCLAlertView-Objective-C (~> 0.7.5)` is not used in any concrete target.
The dependency `MWPhotoBrowser (~> 1.4.1)` is not used in any concrete target.
The dependency `MMMarkdown (~> 0.5)` is not used in any concrete target.
The dependency `MJExtension (~> 2.5.16)` is not used in any concrete target.
The dependency `MJRefresh (~> 2.4.12)` is not used in any concrete target.
The dependency `Masonry (~> 0.6.3)` is not used in any concrete target.

我用的三方库比较多，挺长的，出这个错是告诉我们我们所用的库没有指定target，它不知道用在哪里，所以就给报错了，然后我去了cocoapods的官网看了下，cocoapods官网地址

官网是这样给推荐的：
在创建Podfile的时候，用这种格式使用，

platform :ios, '8.0'
use_frameworks!

target 'MyApp' do
  pod 'AFNetworking', '~> 2.6'
  pod 'ORStackView', '~> 3.0'
  pod 'SwiftyJSON', '~> 2.3'
end

• 里面的 MyApp 记得替换为自己攻城里面的target。这样就基本OK了，执行pod install / pod update 就都可以了。

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