CKContainer.discoverAllIdentities always fails

Question

The CKContainer.discoverAllIdentities request always fails in my CloudKit app. It has continually failed over the course of several days.

A simplified versi

Answer 1

Problem:

This was a problem in iOS 11.0

Based on my testing:

This works ok in Xcode 9.2 / iOS 11.2.1 on the device (not simulator)

After resetting the simulator works for the first time, doesn't work subsequently, however on the device it works repeatedly.

Code:

let queue = OperationQueue()

func requestPermissions(for permissions: CKApplicationPermissions,
                        completionHandler: @escaping (CKApplicationPermissionStatus, Error?) -> ()) {
    
    CKContainer.default().requestApplicationPermission(permissions) { status, error in
        
        if let error = error {
            
            print("Error for requesting \(permissions) - \(error)")
        }
        
        let statusMessage : String
        
        switch status {
            
        case .granted:
            statusMessage = "Granted"
        case .denied:
            statusMessage = "Denied"
        case .couldNotComplete:
            statusMessage = "Could not complete"
        case .initialState:
            statusMessage = "Initial state"
        }
        
        print("Permission - \(statusMessage)")
        
        completionHandler(status, error)
    }
}


private func discoverAllUsers() {
    
    let operation = CKDiscoverAllUserIdentitiesOperation()
    
    operation.userIdentityDiscoveredBlock = { userIdentity in
        
        print("userIdentity = \(userIdentity)")
    }
    
    operation.discoverAllUserIdentitiesCompletionBlock = { error in
        
        if let error = error {
            
            print("Discover all users Error: \(error) ")
        }
        else {
            print("Discover all users completed successfully")
        }
    }
    
    queue.addOperation(operation)
}