fetch-cloudkit-share.swift

    public func fetchShareURL(_ callback: @escaping ((_ url: URL?) -> Void)) -> Void {
        
        if let localRecordZoneID: CKRecordZoneID = SOUser.localICloudConversationRecordID?.zoneID {

            let predicate: NSPredicate = NSPredicate(format: "TRUEPREDICATE")
            let query: CKQuery = CKQuery(recordType: CloudKitConverationRecordTypeName, predicate: predicate)
            let cloudkitController: CloudKitController = CloudKitController(scope: .private)
            
            cloudkitController.perform(query, inZoneWith: localRecordZoneID, completionHandler: {results, error in

                guard let share: CKReference = results?.first?.share else {
                    
                    callback(nil)
                    return
                }

                cloudkitController.fetch(withRecordID: share.recordID, completionHandler: {record, error in
                    
                    guard let sharedRecord: CKShare = record as? CKShare,
                        let sharedURL: URL = sharedRecord.url else {
                        
                        callback(nil)
                        return
                    }
                    
                    callback(sharedURL)
                })
            })

        } else {

            callback(nil)
        }
    }