SwiftUI List performance

Hi, community: I was trying to move from application(_:open:options:) (UIKit) to onOpenURL(perform:) (SwiftUI). Maybe there's something that I'm missing. In UIKit you can say to the system that you won't handle the URL then the app is not opened, but when I use onOpenURL(perform:) it is always opened. Is there any way to achieve the same behavior? Thanks in advance.

Is there a way to change the selection color of a List in SwiftUI?

Filesystem performance on directories with non-trivial number of entires abysmal under Beta 3 and Beta 4. Finder rountinely locks up for many minutes at a time while listing directories, recursive deletion of files using command line takes minutes to hours with non-trivial directory nesting. Using a rotational hard disk, apfs.Problem is confined to a single profile.Booting to a separate volume on same disk with just a bare home directory has no performance problems.Problem home directory was populated using rsync from existing High Sierra machine (HFS+) — Migration Assistant was exhibiting same abysmal write rates (I'm guessing - estimated time to completion for 700GB was 100s of hours using 1000 BaseT direct connection).Is anyone else seeing this? Any suggestions on diagnosing problem? Submitting a radar is likely to elicit a reflexive request for a spindump — which is likely to take until release of beta 5 with current performance. I'd like more information before I file

I noticed that the behaviour of a copy or move window appears to calculate and perform differently from past OS X releases. There appears to be no issue but some users may believe there is an issue if they are not patient.Here is my setup.Newtork ISP Router - ethernet > Express - WIFI N -> Extreme (in bridge mode w/express)Here is what I did.1) Moved a 6GB file from the 10.11 desktop to a drive attached to the Extreme via a USB hub2) As the move began, only 1KB was tranferring per increment, it then began to increase and increase but disappointingly, the expected completion time was reportedly 15 hours.3) Patience persisted and 2GB into the move, there are 20 minutes remaining.I don't recall the calculated time, in this case 15 hours, displaying for as long as it did in past versions of OSX.In case you have a network performance issue or believe you do, please perform proper troubleshooting before suspecting the Finder or 10.11. Also consider wireless network interference wher

I am using the new pure SwiftUI App and Scene structs instead of an AppDelegate. Some of my views accept custom url schemes and user activities using onOpenURL(perform:). Everything works as expected. However, starting with Beta 6, Xcodes gives the following runtime warning: runtime: SwiftUI: Cannot use Scene methods for URL, NSUserActivity, and other External Events without using SwiftUI Lifecycle. Without SwiftUI Lifecycle, advertising and handling External Events wastes resources, and will have unpredictable results. What exactly am I doing wrong? What is *SwiftUI Lifecycle* referring to?

Hello. Can anyone tell me how to implement horizontal and vertical list synchronization in swiftui? For example, a horizontal list is a group, a vertical list is a row of groups. Example: drive.google.com/file/d/13CVnUYaf4zyD295LnDUFJ7aNLVKDfYvp/view?usp=sharing