+1 - same issue here too. Reported via FB16927025

As of now, March 20, issue is fixed (for me): re-try for several times. now downloading seems stable and OK. visionOS 2.4 beta 4 (22O5230a) SDK + visionOS 2.4 beta 4 (22O5231b) Simulator (Installed)

can confirm. as of now (March 20) download is OK - fixed. visionOS 2.4 beta 4 (22O5230a) SDK + visionOS 2.4 beta 4 (22O5231b) Simulator (Installed)

here also issues with indexing documentation [https://developer.apple.com/forums/thread/777010) maybe related?

I have just updated my feedback request FB16926964 with all the latest information regarding the missing UIKit area and described the severity and urgency as increased. Thanks to all involved for helping with the analysis.

I have just updated my feedback request FB16926964 with all the latest information regarding the missing UIKit area and described the severity and urgency as increased. Thanks to all involved for helping with the analysis.

little bit late to the party… …but did you already tried to clean build folder? remove derived app build data folder contents?

Hi @mattn at least UIKit is now showing up with latest Xcode 16.3 RC. (24 Mar - (16E137)). Have fun.

Installed Xcode 16.3 RC (Version 16.3 (16E137)) fixed: UIKit is showing up in Documentation. This is fixed. Thanks. :-( BUT NOT FIXED - Issue with high CPU consumption >80% Xcode Process, Indexing stucked. with Version 16.3 (16E137) the Index Directory name has changed to v278, but unfortunately same issues as with previous beta 3 (277). Starting indexing, but after some minutes it looks like stuck and the size-increase of the directories is halting. Normally (expecting from v275 16.2 is about 534MB); in 16.3 RC + Beta3 it is stopping around 61MB. Xcode Process is continuing running with about 80% CPU consumption! Feedback FB16926964 is updated.

oh...at least the issue was recognized. interim solution from Apple's point of view. I am running 16.3 RC Xcode. Furthermore I copied the index from 16.3Beta2 (so I have a complete 16.3 Doc-Index, with UIKit and can work without burning CPU). No problems so far. But there will hopefully be another fix so that the error is finally corrected in 16.3.x.

Here with Xcode 16.3 all fine. Do you still have issues with latest Xcode version (Version 16.3 (16E140))?

hi, issue is known, since beta3. [https://developer.apple.com/forums/thread/777010) reported to apple via https://feedbackassistant.apple.com/feedback/16926964 and also already acknowledged in release notes for 16.3 [https://developer.apple.com/documentation/xcode-release-notes/xcode-16_3-release-notes#Developer-Documentation-Window) workaround for mitigation is: defaults write com.apple.dt.Xcode IDEDocumentationSpotlightIndexDisable -bool YES

+1 I can also confirm the malfunction here. That annoys me too. It seems that 16.3 is not really a good value (so many issues).

hi, for ‘references’ topic see here: [https://developer.apple.com/forums/thread/782153?answerId=836739022#836739022) for expected size reduction: most size (and complexity reduction) comes from using folders instead of groups. see here for further information: [https://developer.apple.com/documentation/xcode/managing-files-and-folders-in-your-xcode-project#Convert-groups-to-folders)

ah...fixed! :-} with latest Xcode (28 April 2025) Version 16.4 beta (16F1t) The size of the preview pane is kept between editor/file changes and is not reset to a default value.