Question: Xcode is stuck Generating Previews after trying to migrate my project from `Swift 2.3` to `Swift 3`.

Is there anyway to check the status of this process without cancelling?

I'm using Cocoapods and I've already changed all of the Swift pods to `Swift 3` versions.

[![Generating preview](https://i.stack.imgur.com/AZ9A1.png)](https://i.stack.imgur.com/AZ9A1.png)

Answer: 
For people that are still stuck at "Generating Preview". Check if you have any class names defined that clashes with the (new) public api in Swift 3. 

E.g. I had an 'Error.swift' class, which I had to rename. Since all 'NS' prefixes are being removed, this would cause the converter to keep running without providing us an error message.
Running migration from the command line worked for me. Try using this script:

<https://gist.github.com/davidahouse/18dd78bef7ae543117c396f8c950ccfe>