Why are my Xcode plugins (such as clang format) installed with Alcatraz no longer working after updating to new version of Xcode?

Oftentimes, the following helps: Re-install Alcatraz, restart Xcode, de-install and re-install your plugin. Sometimes it helps to restart Xcode again. This worked for me.

If your plugin still does not show up, the problem is probably that the the compatibility key of your new Xcode is not yet included in the list of compatibility keys of your plugin.

Possible solutions:

• Wait for an update of the plugin that includes the new UUID of Xcode
• If you do not want to wait (for example, if you installed a beta of Xcode and it would take too long for the plugins to be updated), you may manually add the new UUID of Xcode to the plugin (details on how to do this see below). Of course, there is no guarantee that your plugin will work then. If Xcode has changed so that it is really not compatible anymore, it will, of course, not work. However, oftentimes it will work.

To add the new UUID to the plugin:

In terminal, enter the following if you use Xcode 6.3.2:

find ~/Library/Application\ Support/Developer/Shared/Xcode/Plug-ins -name Info.plist -maxdepth 3 | xargs -I{} defaults write {} DVTPlugInCompatibilityUUIDs -array-add E969541F-E6F9-4D25-8158-72DC3545A6C6

For other versions of Xcode, get the UUID of Xcode via the terminal: defaults read /Applications/Xcode.app/Contents/Info DVTPlugInCompatibilityUUID and use it to update the UUID in the find command above.

[Instead of using the find command above, you may also manually add the new UUID to the DVTPlugInCompatibilityUUIDs key in the plugin package (your xcplugin file --> show package contents --> Contents/Info.plist)]

Sources: GitHub and post by "ianmasters"

After install Xcode 6.4, I choose "Skip Bundles",I can't find Alcatraz.

Fisrt I try the add UUID,but Alcatraz also no working;

Then try this:

defaults read com.apple.dt.Xcode DVTPlugInManagerNonApplePlugIns-Xcode-6.4 

In iTerm show below:

allowed =     {
};
skipped =     {
    "com.mneorr.Alcatraz" =         {
        version = 1;
    };
};

but this file can't edit,so delete:

defaults delete com.apple.dt.Xcode DVTPlugInManagerNonApplePlugIns-Xcode-6.4

Next,I reinstall Alcatraz,Xcode show “Load Bundles" again,this time I will not make wrong,choose "Load Bundles".

You could use this script to update your Xcode's plugin after update (works fine with Xcode 7.3):

#!/bin/bash
xcodeUUID=`defaults read /Applications/Xcode.app/Contents/Info DVTPlugInCompatibilityUUID`
echo $xcodeUUID
find ~/Library/Application\ Support/Developer/Shared/Xcode/Plug-ins -name Info.plist -maxdepth 3 | xargs -I{} defaults write {} DVTPlugInCompatibilityUUIDs -array-add $xcodeUUID

or copy from my gist https://gist.github.com/MaciejGad/86302b6b8bdb1ee25115