这是我在项目中使用的podfile：
source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '9.0'
use_frameworks!
pod 'AFNetworking', '~> 2.0'
pod 'GoogleMaps'
pod 'MONActivityIndicatorView'
pod 'NYXImagesKit'
pod 'MagicalRecord'
pod 'FBSDKCoreKit'
pod 'FBSDKShareKit'
pod 'FBSDKLoginKit'
pod 'Countly'
问题是cocoapods 0.39正在将AFNetworking更新到版本2.5.4，这是错误的。最新版本是2.6.3还将facebook SDK更新到4.4（最新是4.8）等。
我试图删除Pods文件夹和.lock文件，但无济于事
还尝试清理cocoapods缓存，但没有帮助：
MACMINI:myproject myusername$ pod cache clean --all
MACMINI:myproject myusername$ pod update
Update all pods
Updating local specs repositories
Analyzing dependencies
Downloading dependencies
Installing AFNetworking (2.5.4)
Installing Bolts (1.2.0)
Installing Countly (15.06.01)
Installing FBSDKCoreKit (4.4.0)
Installing FBSDKLoginKit (4.4.0)
Installing FBSDKShareKit (4.4.0)
Installing GoogleMaps (1.10.1)
Installing MONActivityIndicatorView (0.0.3)
Installing MagicalRecord (2.3.0)
Installing NYXImagesKit (2.3)
Generating Pods project
Integrating client project
[!] Please close any current Xcode sessions and use `myproject.xcworkspace` for this project from now on.
Sending stats
Sending stats
Pod installation complete! There are 9 dependencies from the Podfile and 10 total pods installed.
删除并重新安装可可足类可解决此问题：
MACMINI:myproject myusername$ sudo rm -fr ~/.cocoapods/repos/master
Password:
MACMINI:myproject myusername$ pod setup
Setting up CocoaPods master repo
Setup completed
MACMINI:myproject myusername$ cd ~/myproject/
MACMINI:myproject myusername$ pod update
Update all pods
Updating local specs repositories
Analyzing dependencies
Downloading dependencies
Installing AFNetworking 2.6.3 (was 2.5.4)
Installing Bolts 1.5.0 (was 1.2.0)
Using Countly (15.06.01)
Installing FBSDKCoreKit 4.8.0 (was 4.4.0)
Installing FBSDKLoginKit 4.8.0 (was 4.4.0)
Installing FBSDKShareKit 4.8.0 (was 4.4.0)
Installing GoogleMaps 1.10.5 (was 1.10.1)
Using MONActivityIndicatorView (0.0.3)
Using MagicalRecord (2.3.0)
Using NYXImagesKit (2.3)
Generating Pods project
Integrating client project
Sending stats
Sending stats
Pod installation complete! There are 9 dependencies from the Podfile and 10 total pods installed.
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我来说两句