I am new to Metal, and have no experience with OpenGL, shaders, or GPU commands. I have been trying to use Metal for video editing, and have gotten some basic stuff working, though it has been a very slow process, as the learning curve for Metal is quite steep, especially if you are coming at it as a complete GPU novice. Can someone recommend some good resources (i.e. books or video courses) that may help me to get a better grip with the basics of Metal, and use it focused as a video editor?

When a user selects a new tab in a TabView via VoiceOver, the focus remains at the tab button, which is not an ideal user experience. With UIKit I could use: UIAccessibility.post(notification: .screenChanged, argument: UIView) to update focus; however, I can't figure out how to do something similar using SwiftUI. Is there an analogue or work around using SwiftUI, or does these ability just not exist yet?

I have been trying to get VoiceOver focus to change when the user selects a new tab inside a UITabBar. The default behavior seems to be that it just stays on the selected tab item, which is an awful user experience. For some reason: UIAccessibility.post(notification: .screenChanged, argument: view) does not work; nor does .layoutChanged work. Is there a way to set focus when a new tab is selected on a tab bar, or will I just have to hack together a solution that does not use a UIKit UITabBarController?