pod install失败：Generating deterministic UUIDs

当我又安转了一个新版本的 Xcode 后，用这个新版本的 Xcode新项目，然后用 pod  install的时候出现：

  - Writing Xcode project file to `Pods/Pods.xcodeproj`

    - Generating deterministic UUIDs

Abort trap: 6

解决方法：https://stackoverflow.com/questions/31085306/error-generating-pods-project-pod-install

Try running this in terminal:

sudo xcode-select -s /Applications/Xcode.app/Contents/Developer

Then try your CocoaPods install again:

pod install

I then had no problems going back to the Xcode beta with this command:

sudo xcode-select -s /Applications/Xcode-beta.app/Contents/Developer

我的：sudo xcode-select -s /Users/Jo/Downloads/Xcode8.3.3.app/Contents/Developer