I get the following errors when running the code below in a sandboxed app (it works when not sandboxed) and I have the com.apple.security.device.usb entitlement enabled. Error:Unable to open io_service_t object and create user client. with reason: IOServiceOpen failed. Error Domain=IOUSBHostErrorDomain Code=-536870174 "Failed to create IOUSBHostObject." UserInfo={NSLocalizedRecoverySuggestion=, NSLocalizedDescription=Failed to create IOUSBHostObject., NSLocalizedFailureReason=IOServiceOpen failed.} import Foundation import IOKit import IOKit.usb import IOKit.usb.IOUSBLib import IOKit.serial import IOUSBHost import IOUSBHost.IOUSBHostInterface class USBService {     enum UsbError: Error {         case noDeviceMatched         case deviceCriteriaNotUnique     }          init() {              }          func getDevice(idVendor: Int?, idProduct: Int?) throws {         let deviceSearchPattern: [IOUSBHostMatchingPropertyKey : Int] = [                    .vendorID : idVendor!,                    .productID : idProduct!,                ]                let deviceDomain = [ "IOProviderClass": "IOUSBHostDevice" ]                let searchRequest = (deviceSearchPattern as NSDictionary).mutableCopy() as! NSMutableDictionary                searchRequest.addEntries(from: deviceDomain)         let service = IOServiceGetMatchingService(kIOMasterPortDefault, searchRequest)         guard service != 0 else {                    throw UsbError.noDeviceMatched         }                       let device = try IOUSBHostDevice.init(__ioService: service, options: [], queue: nil, interestHandler: nil)                  print(device.deviceDescriptor?.pointee.idProduct)     } }

I'd like some help to structure navigation so that I can have an app that: shows a sidebar view with a default detail view when it opens clicking on each sidebar item loads the details view clicking on an item in the details views pushes a full width view (without sidebar visible) I just don't get how to use NavigationView to achieve this and none of the tutorials I've seen does something similar. I've been stuck for quite a while on this and some guidance would save my week! Thanks.

My app will have a concept of "packs" and the lessons inside the packs are interactive music learning experiences interacting with midi instruments (not always, only if the user has one, otherwise they can click around the virtual instrument on the UI). I want to build it in a way that users download each one as if it was a Swift Playgrounds book. This would allow for a leaner app and not having a huge binary. Constraints: App will be served on the app store Related: I think I could achieve this using json config and having already views in the app that read the config and render the correct UI flow I also saw this gist - https://gist.github.com/chriseidhof/26768f0b63fa3cdf8b46821e099df5ff that runs from the cli and got intriguided Is this possible and allowed for apps in the App Store? Cheers for any replies.