Display a particular user and all their information stored on parse on a different View Controller in Swift

Question

In my app each user sets up a profile page and all this info is stored on Parse. When the current user hits a button it segues to a tableViewController that displays in cells all the other users on the app. In each cell there is a button which the user presses to view the full profile page of the user that they have selected. I have a VC set up to hold all the info I just don't know how to display the particular user that the current user has selected into it. How do I single out the chosen users information? I have read the Parse documentation on relational queries but I can't seem to get my head around it. https://parse.com/docs/ios/guide#queries-relational-queries

So in finer detail basically all my users are displaying on a VC. It has name and profile picture, when the user clicks on the info button beside a certain user it should open a new screen and display all of this users information stored on Parse.

I have tried creating a static outside the class

struct Data { var OtherName:String! var id:String! }

And then in my ViewDidLoad:

    let query = PFQuery(className: "_User")
    //  otherQuery.orderByDescending("createdAt")
    query.whereKey("username", notEqualTo:PFUser.currentUser()!.username!)
    query.findObjectsInBackgroundWithBlock { (users: [AnyObject]?, error: NSError?) -> Void in

        if error == nil {
            // success

            print(users!.count)
            for user in users! {
                self.imageFiles.append(user["image"] as! PFFile)
                self.instrumentText.append(user["instrument"] as! String)
                self.nameText.append(user["name"] as! String)
                self.ageText.append(user["age"] as! String)
                // self.locationText.append(user["location"] as! PFGeoPoint)

                var singleData = Data()
                singleData.id = user.objectId
                singleData.OtherName = user["name"] as! String
                print("\(singleData)")


            } // users

Then on the VC that the info button segues to I am trying to call it and upload each label with just the user that was selected.

        self.userName.text = "" as String

But the "" is staying blank.

Then I was thinking maybe if I add that when the more info button is pressed that the user it was pressed on gets chosen and is added to a chosen string on Parse and then I just have to call the user from the chosen string when I am on the chosen users profile page and call the info that way and then when the user clicks the back button the user is no longer chosen. It just seems like I would be adding and taking away a lot of users to "chosen" in Parse is there a better way?

I am able to display all the users info but how do I just display a chosen user from Parse without using the objectId because at the top of each cell it will return a different user here each time depending on settings previously set on a different VC such as only show users in a certain age bracket etc. I know I must set an Id of some sort on button touched but I am at a complete loss. The only online help out there that I can find is set for other languages eg. https://parse.com/docs/js/guide#users-querying> So I guess my question is :

1.Does anyone know a tutorial they could point me towards.

2.Does anyone know how I even get started and I can go from there myself.

3.Can anyone help?

*Swift and Parse newbie little to no experience in other languages.

New code in firstVC:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "userProfileDetailsSegue" {
    if let indexPath = resultsPageTableView.indexPathForSelectedRow {

        let controller = (segue.destinationViewController) as! UserProfileDetailsViewController

  ***error here: UserProfileDetailsViewController.userToShowDetail = indexPath.row
    //line above is the one I can't get to work it needs to equal to the cell selected?
    }
  }
}

New Code in destinationVC:

 var userToShowDetail: PFUser? {
    didSet {
        self.configureView()
    }
}

func configureView() {
    // Update the user interface for the detail item.
    if let userToShowDetail: PFUser = self.userToShowDetail {
        if let label = self.userName {
            nameText.append(userToShowDetail["name"] as! String)

           // self.nameText.append(user["name"] as! String)


    }
}
}

Answer 1

You're going to need to do a couple of things for this to work. First, in the view controller that you're using to show another user's information, you need to set a property like var userToShowDetail: PFUser?. Then in your view with all of the users of your app, you need to create a segue to bring them from the current view to the detail view. Assuming you're using a TableView, you can connect just one prototype cell to the detail view you're trying to navigate. Then you'll need to override prepareForSegue and set the new view controller's user equal to the user at the row that was selected. I don't know how you're storing your objects of user's of your app, but you should probably be able to do something like this.

override fun prepareForSegue(segue: UIStoryboardSegue) {
    if segue.identifer == "segueToShowDetailInfo" {
        //get the index path for the row that was selected
        let indexPath = self.tableView.indexPathForSelectedRow()
        //get the PFUser object for that particular row
        let userToShow = self.appUsers[indexPath.row]
        //create your new view controller
        let newVc = segue.destinationViewController as! DestinationVC
        //assign the new vc's property to your object
        newVc.userToShowDetail = userToShow
    }
}

But in your query, you probably shouldn't have a separate array of the the different parts of the user's data. You should just make one array, call it var appUsers = [PFUser]() and then when you get a user back in your query, just say:

for user in users! {
    self.appUsers.append(user) as! PFUser
}

There, now you have a whole array of objects that holds a reference to every user. When someone is using your app, and selects a cell, then you can perform the prepare for segue method as above.

Note that I also noticed you have a didSet on your variable in your new view controller. Calling a function to update the UI after this variable is set will not work, and may crash, because the view controller doesn't have a window yet.