I have the same problem with Xcode 12 beta 6 and an iPhone X running iOS 13.7. (It was working previously when I had 13.5 installed.)
gtrichar
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
From
Seattle, WA, United States
Post
Replies
Boosts
Views
Activity
I have the same problem with Xcode 12 beta 6 and an iPhone X running iOS 13.7. (It was working previously when I had 13.5 installed.)
@devinthecold: No, for me the process taking 100-160% CPU is Xcode, for the entire time it's open, even when I'm not touching it. If I switch back to Beta 6, Xcode uses 0% when idle. I can switch back and forth between them and see the same behavior consistently.
@KMT: 32 GB ram. 2.9 GHz 6-Core Intel Core i9. I have tried rebooting and the behavior didn't change.
I've filed a feedback to Apple: https://feedbackassistant.apple.com/feedback/8701240
I have the same problem in Xcode 13.3.1, macOS 12.3.1, iOS 15.4. Sometimes I wonder if Apple is serious about supporting SwiftUI. This seems like a really basic bug in an extremely common code pattern.