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This session provides sample code for NavigationSplitView to display a selected item in details view, and refers to the Backyard Birds sample app; NavigationSplitView { List(backyardsData.backyards, selection: $selectedBackyard) { backyard in BackyardCell(backyard: backyard) } .listStyle(.carousel) } detail: { if let selectedBackyard { BackyardView(backyard: selectedBackyard) } else { BackyardUnavailableView() } } However, the sample code does not work on watchOS 10 beta 1 or 2, and even the sample app Backyard Birds does not use this pattern in code (this links to Watch ContentView file on Apple's GitHub repo). To make sure I wasn't crazy, I've tried to navigate to details view when the data set is: a @State var with array of items a class conforming to ObservableObject and holding a @Published array of items (similar to what Backyard Birds is doing) FetchedResults from CoreData None of them do anything when a “cell” is tapped. My conclusion is that it isn't yet implemented [right]. Has anyone else got it to work?

An app running on device that successfully registered for remote notifications with device token is not getting remote notifications from CloudKit: it is not getting triggered for CKRecordZoneSubscription in a custom zone in the private database it is not getting triggered for CKDatabaseSubscription in the shared database The same app is running smoothly on two other 15.1 devices Is anyone else experiencing this? What could be the cause of this?

CloudKit documentation states that tokens for CKFetchDatabaseChangesOperation and CKFetchRecordZoneChangesOperation aren't compatible and should be segregated in app's cache. I have written a class to help persist these tokens in UserDefaults (code below). The class constructs strings to be used as UserDefaults keys based on the following logic: For zones, zoneID.ownerName + zoneID.zoneName, which results in something like _defaultOwner__Employees For databases, "db" + database.databaseScope.rawValue, which results in something like db3 for shared database While I'm quite happy how this works, I've realized that this exposes iCloud userIDs when you persist a zone from a shared database. How big of a security problem is this? Any suggestions what I could do differently? Code: (also available as GitHub gist) import CloudKit final class ChangeTokenCache {     // MARK: - Zone support     /// Determines a unique UserDefaults key for storing zone change tokens     /// like from CKFetchRecordZoneChangesOperation     private static func userDefaultsKey(_ zoneID: CKRecordZone.ID) -> String {         return "token_" + zoneID.ownerName + zoneID.zoneName     }     /// Persists a zone change token in standard UserDefaults     static func setZoneToken(_ zoneID: CKRecordZone.ID, token: CKServerChangeToken?) {         setToken(userDefaultsKey(zoneID), token: token)     }     /// Fetches a zone change token from standard UserDefaults     static func getZoneToken(_ zoneID: CKRecordZone.ID) -> CKServerChangeToken? {         return getToken(userDefaultsKey(zoneID))     }     // MARK: - Database support     /// Determines a unique UserDefaults key for storing database change tokens     /// like from CKFetchDatabaseChangesOperation     private static func userDefaultsKey(_ database: CKDatabase) -> String {         return "token_db\(database.databaseScope.rawValue)"     }     /// Persists a database change token in standard UserDefaults     static func setDatabaseToken(_ database: CKDatabase, token: CKServerChangeToken?) {         setToken(userDefaultsKey(database), token: token)     }     /// Fetches a database change token from standard UserDefaults     static func getDatabaseToken(_ database: CKDatabase) -> CKServerChangeToken? {         return getToken(userDefaultsKey(database))     }     // MARK: - Actual workers     /// Private method that archives a token as data and persists that to UserDefaults     private static func setToken(_ userDefaultsKey: String, token: CKServerChangeToken?) {         if let token = token,            let data = try? NSKeyedArchiver.archivedData(withRootObject: token, requiringSecureCoding: false) {             UserDefaults.standard.set(data, forKey: userDefaultsKey)         } else {             UserDefaults.standard.removeObject(forKey: userDefaultsKey)         }     }     /// Private method that gets data from UserDefaults and unarchives it as a token     private static func getToken(_ userDefaultsKey: String) -> CKServerChangeToken? {         guard let data = UserDefaults.standard.value(forKey: userDefaultsKey) as? Data else { return nil }         var token: CKServerChangeToken?         do {             token = try NSKeyedUnarchiver.unarchivedObject(ofClass: CKServerChangeToken.self, from: data)         } catch {             token = nil         }         return token     } }