cocoapods diff: /../Podfile.lock: No such file or directory 解决方案

　　在运行之前的使用 CocoaPods 工程时，有时会报错：diff: /../Podfile.lock: No such file or directory diff: /Manifest.lock: No such file or directory error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.

　　解决方案：
　　打开工程目录：删除以下文件

　　xcworkspace
　　Podfile.lock
　　Pods文件夹
　　~/Library/Developer/Xcode/DerivedData路径下对应工程的文件夹  
　　重新执行 Pod install。