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I have an application that uses body motion tracking like in WWDC 2019. I am trying to have a character one to one mapped within my body and replacing the character's head with my head.

Is it possible to hide the head joint to accomplish this feature?

I am dealing with a hard-to-reproduce memory crash, and troubleshooting using the guidance provided in the wwdc18 session 414 with additional clues from this so article

I have no issues symbolicating the stack trace (see at bottom), but when I try to disassemble the address from the last frame, I get this error from the lldb console:

I'm following this WWDC video and some sample code found online (regrettably Apple didn't include sample code in its WWDC talk), with this code below I am getting my CKShareParticipant ok but this block modOperation.modifyRecordsCompletionBlock is not returning at all, what am I doing wrong?

I am currently working with Metal's ray tracing API. I remembered I could pass data from an intersection function to the compute kernel that started the ray intersection process. After rewatching the WWDC 2020 talk Discover ray tracing with Metal by Sean James (linked here), I found the relevant section around 16:13 where he talks about the ray payload.

However, I was curious where this payload is stored as it’s passed to the intersection function. When declared with the relevant [[ payload ]] attribute in the intersection function, it must be in the ray_data address space. According to the Metal Shading Language Specification (version 2.3), pg. 64, the data passed into the intersection function is copied in the ray_data address space and is copied back out once the intersection function returns. However, this doesn't specify if, e.g., the data is stored in tile memory (like data in the threadgroup address space is) or stored in the per-thread memory (thread address space). The video did not specify this either.

In fact, the declarations for the intersect function (see pg. 204) that include the payload term are in the thread address space (which makes sense)

So where does the copied ray_data "version" of the data stored in the thread address space in the kernel go?

Looking for some direction

I'm working with PDFKit. Everything is going fine but having trouble finding the methods (documentation / WWDC / elsewhere ) on how to stop text from drawing at a certain y position and start the next page. Any saved references or a snippet of code would be a great help.

The onFocusChange closure in the focusable(_:onFocusChange:) modifier allows me to set properties for the parent view when child views are focused, like this:

I am new to swift, this might be a stupid question but it confuses me a long time. Here is my code, I wrote this code by imitating the sandwich example from WWDC 2020's intro to swiftUI.

Is it OK to use SwiftUI in a playground when submitting the playground file for WWDC 2021 Scholarship?

So, Apple says they only accept the playground file, and it seems using SwiftUI makes me way easier to create a scene. But I'm not sure whether it is OK to do it, or will the tester grade me lower for using SwiftUI?

So my problem is that I am trying to align text from different HStacks. Different sized SFSymbols are causing this problem.

I know that AlignmentGuide can solve my problem but I'm not sure how to implement. If anyone can lend any insight I would be greatly appreciative!

I have watched the WWDC talk on this.

And this is the main screen that relates to this problem,

Yet I need a little clarification of to put it together.

Here is relevant code