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

前几天电脑重装了系统，CocoaPods报错！

[!] The dependency `SDWebImage` is not used in any concrete target.
The dependency `Reachability` is not used in any concrete target.
The dependency `JSONModel` is not used in any concrete target.
The dependency `MBProgressHUD` is not used in any concrete target.
The dependency `Masonry` is not used in any concrete target.
The dependency `HexColors` is not used in any concrete target.
The dependency `AFNetworking (~> 3.1.0)` is not used in any concrete target.
The dependency `SVProgressHUD` is not used in any concrete target.
The dependency `FastAnimationWithPOP` is not used in any concrete target.
The dependency `CocoaSecurity` is not used in any concrete target.
The dependency `Toast` is not used in any concrete target.
The dependency `JSPatch (~> 1.0)` is not used in any concrete target.
The dependency `WebViewJavascriptBridge (~> 4.1.4)` is not used in any concrete target.
The dependency `NJKWebViewProgress` is not used in any concrete target.
The dependency `MJRefresh` is not used in any concrete target.
The dependency `MJExtension` is not used in any concrete target.
The dependency `UMengAnalyticsSDK` is not used in any concrete target.
The dependency `UMengFeedbackSDK` is not used in any concrete target.
The dependency `Bugtags` is not used in any concrete target.
The dependency `YYKit` is not used in any concrete target.
The dependency `CocoaLumberjack` is not used in any concrete target.

/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/installer/analyzer.rb:164:in `validate_podfile!'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/installer/analyzer.rb:62:in `analyze'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/installer.rb:227:in `analyze'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/installer.rb:151:in `block in resolve_dependencies'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/user_interface.rb:63:in `section'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/installer.rb:150:in `resolve_dependencies'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/installer.rb:114:in `install!'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/command/update.rb:60:in `run'
/Library/Ruby/Gems/2.0.0/gems/claide-1.0.0/lib/claide/command.rb:334:in `run'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/command.rb:50:in `run'
/Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/bin/pod:55:in `'
/usr/local/bin/pod:23:in `load'
/usr/local/bin/pod:23:in `
'
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• 提示，大概就是我的版本不是 last version，就是下面这个：

sudo gem install cocoapods --pre
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安装cocoapods的预览版本，就会更新下来新的1.0.1版本，如下所示：

Successfully installed cocoapods-1.0.1
Parsing documentation for cocoapods-1.0.1
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更新了新的版本，出错如下：

Updating local specs repositories
Analyzing dependencies
[!] The dependency `SDWebImage` is not used in any concrete target.
The dependency `Reachability` is not used in any concrete target.
The dependency `JSONModel` is not used in any concrete target.
The dependency `MBProgressHUD` is not used in any concrete target.
The dependency `Masonry` is not used in any concrete target.
The dependency `HexColors` is not used in any concrete target.
The dependency `AFNetworking (~> 3.1.0)` is not used in any concrete target.
The dependency `SVProgressHUD` is not used in any concrete target.
The dependency `FastAnimationWithPOP` is not used in any concrete target.
The dependency `CocoaSecurity` is not used in any concrete target.
The dependency `Toast` is not used in any concrete target.
The dependency `JSPatch (~> 1.0)` is not used in any concrete target.
The dependency `WebViewJavascriptBridge (~> 4.1.4)` is not used in any concrete target.
The dependency `NJKWebViewProgress` is not used in any concrete target.
The dependency `MJRefresh` is not used in any concrete target.
The dependency `MJExtension` is not used in any concrete target.
The dependency `UMengAnalyticsSDK` is not used in any concrete target.
The dependency `UMengFeedbackSDK` is not used in any concrete target.
The dependency `Bugtags` is not used in any concrete target.
The dependency `YYKit` is not used in any concrete target.
The dependency `CocoaLumberjack` is not used in any concrete target.
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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!个别需要用到它，比如reactiveCocoa

target 'MyApp' do
  pod 'AFNetworking', '~> 2.6'
  pod 'ORStackView', '~> 3.0'
  pod 'SwiftyJSON', '~> 2.3'
end
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• 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。（use_frameworks! 这个是个别需要的，这里修改一下，可以把我上面的代码中的这一行【删除】）

---

下面是另外一种写法，

platform :ios, '8.0'
#use_frameworks!个别需要用到它，比如reactiveCocoa

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