How to condition segues using CloudKit query?

问题

I created a login page backed up by CloudKit. I want to know how to create a conditioned segue if the login has a certain value, and then direct the user to a View Controller based on that value

In details, I have three Segues I want to connect:

sign in id segue:LoginSuccessSegue

staff tab bar id segue:idStaffTabBar

student tab bar id segue:idStudentTabBar

First Segue LoginSuccessSegue: the sign in view controller has a show segue id LoginSuccessSegue the connects to staff tab bar controller and student tab bar controller.

Second Segue idStaffTabBar: After queryProfileType() is executed, it will look for the profile type in a list to check if the user profile is a teacher value or something else. Then if that is true "LoginSuccessSegue" will automatically take the user to staff tab bar controller, "StaffBookedVC.self" by usingits segueidStaffTabBar `

Third Segue idStudentTabBar: if the user is not a teacher then after pressing the sign in button redirect to student tab bar controller, "stdBookingVC.self" by using idStudentTabBar or

How can I achieve an automatic conditional sign in in multiple views suing segues and cloud kit query?

This is the code for the sign-in button:

@IBAction func btnSignInTapped(sender: UIButton)
{
    let userEmailAddress = userEmailAddressTextField.text
    let userPassword = userPasswordTextField.text


    if(userEmailAddress!.isEmpty || userPassword!.isEmpty)
    {
        notifyUser("Empty fields", message: "all fields are required")
    }
    print("fetching is in progress")

    queryProfileType()

    print("\nfetching had stopped")
}//end of signInbtn

func queryProfileType()
{
    queryCredentials()

    print("\nProfile Query starting")
    //execute query
    let organizers = ["Teacher || Youtuber || Instagrammer || "]
    let predicate = NSPredicate(format: "ProfileType = '\(organizers)' ")
    print("\nThis is the predicate\n\(predicate)")
    let query = CKQuery(recordType: "RegisteredAccounts", predicate: predicate)
    publicDatabase!.performQuery(query, inZoneWithID: nil) { results, error in
        if (error != nil)
        {
            print(error)
        }else
            {

                if (results! == organizers)
                {
                    self.performSegueWithIdentifier("idStaffTabBar", sender: StaffBookedVC.self)
                }else{
                    self.performSegueWithIdentifier("idStudentTabBar", sender: stdBookingVC.self)

                }
                print("\(results)\nthese are the printed results")
            }

        }
    let firstFetch = CKFetchRecordsOperation()
    let secondFetch = CKFetchRecordsOperation()
    secondFetch.addDependency(firstFetch)

    let queue = NSOperationQueue()
    queue.addOperations([firstFetch, secondFetch], waitUntilFinished: false)
}

here is a picture of the storyboard segues Storyboard

if your answer will contain these methods, please show me some examples: shouldPerformSegueWithIdentifier and prepareForSegue

this did not work from me either

self.presentViewController(SignInNavigationVCTabBars, animated: true,
                { results, error in

                if (results! == organizers)
                {
                    self.performSegueWithIdentifier("idStaffTabBar", sender: StaffUITABbarVC.self)

                }else{
                    self.performSegueWithIdentifier("idStudentTabBar", sender: StdUITABbarVC.self)

                }
            }

`

回答1:

You need to do something like presentModalViewController to show the navigationController first, within your queryProfileType method. And then do some smart logic to determine which route to go, after the navigationController is loaded. So a custom UINavigationController is needed.

Or an easier way:

Move your loginViewController into the navigation controller stack, and then link the two existing segues, i.e. idStaffTabBar and idStudentTabBar to it. That will solve the problem.

回答2:

Here is the answer

I did not expect valueforkey would have it all what can I see? never stop trying

 //log in function
func queryCredentials()
{
    print("*********\nQueryCredentials starting")

    // System indicator
    let spinningActivity = MBProgressHUD.showHUDAddedTo(self.view, animated: true)
    spinningActivity.labelText = "Signing in"
    spinningActivity.detailsLabelText = "Please wait"


    // querying predicate in cloud kit to check via email and password property
    let predicate = NSPredicate(format: "Email = %@", userEmailAddressTextField.text!)
    let query = CKQuery(recordType: "RegisteredAccounts", predicate: predicate)
    publicDatabase?.performQuery(query, inZoneWithID: nil,
        completionHandler: ({results, error in

            if (error != nil)
            {
                dispatch_async(dispatch_get_main_queue())
                    {
                    // if the user is not signed, display this error
                    self.notifyUser("Cloud Access Error",
                        message: "to fix this error Sign in you icloud \n go to settings\nthen sign in icloud account\n error code:\(error!.localizedDescription)")
                    }
            }else
            {
                if (results!.count > 0)
                {
                    // the results after success case of the query
                    let record = results![0] as! CKRecord

                    // read from the result to navigate via profiletype attribute
                    let proftype = record.valueForKey("ProfileType") as! String

                    switch proftype
                    {
                    case("Teacher"):
                        self.staffView()
                        break;

                    case("Manager"):
                        self.staffView()
                        break;

                    case("Student"):
                        // stdView() is a student coded segue as a function to navigate to student view
                        self.stdView()
                        break;

                    case("Worker"):
                        self.stdView()
                        break;

                    default:
                        break;

                    }
                    self.currentRecord = record

                    dispatch_async(dispatch_get_main_queue())
                        {
                        // if credentials are correct, display you are logged in
                        self.userPasswordTextField!.text =
                            record.objectForKey("Password") as! String
                        self.notifyUser("Welcome", message: "You are loogedin")

                        }
                }else
                {
                    dispatch_async(dispatch_get_main_queue())
                        {
                        self.notifyUser("No Match Found",
                            message: "No record matching")
                        }
                }
            }

        }))
    // hiding indicator
    spinningActivity.hide(true)
}

来源：https://stackoverflow.com/questions/33629123/how-to-condition-segues-using-cloudkit-query