CODEWITHSUNDEEP
iosswiftuialertcontroller
Brosef
Brosef

Reputation: 3095

Error handling with UIAlertController

I have a UIAlertController with a textfield that allows users to type in a title to name a file before sending the data to the server. However, the backend could reject the file for a couple reasons and an error needs to be displayed. How can I display the error I get back from the server in the same alert controller where I entered the file name?

class FileController: UIViewController
{

    var alertController: UIAlertController?

    func savePressed()
    {
        createAlert()
    }

    func createAlert()
    {

        self.alertController = UIAlertController(title: "Save", message: "Name your file.", preferredStyle: .Alert)

        let saveAsPublicAction = UIAlertAction(title: "Make Public", style: .Default) { (_) in

        let fileTitle = self.alertController!.textFields![0] as UITextField

            if fileTitle.text != ""
            {
                self.initiateSave(fileTitle.text!, share: true)
            }
        }

        let saveAsPrivateAction = UIAlertAction(title: "Make Private", style: .Default) { (_) in

            let fileTitle = self.alertController!.textFields![0] as UITextField

            if fileTitle.text != ""
            {
                self.initiateSave(fileTitle.text!, share: false)
            }
        }


        let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel) { (_) in }

        self.alertController!.addTextFieldWithConfigurationHandler { (textField) in

            NSNotificationCenter.defaultCenter().addObserverForName(UITextFieldTextDidChangeNotification, object: textField, queue: NSOperationQueue.mainQueue()) { (notification) in
            saveAsPrivateAction.enabled = textField.text != ""
            saveAsPublicAction.enabled = textField.text != ""
            }
        }

        self.alertController!.addAction(saveAsPublicAction)
        self.alertController!.addAction(saveAsPrivateAction)
        self.alertController!.addAction(cancelAction)

        self.presentViewController(self.alertController!, animated: true, completion: nil)


    }
}

func initiateSave(title:String?, share: Bool?)
{
     //package file
     initiatePost()

}

func initiatePost()
{
     //Send file data to server.  Receive any errors and handle
}

Upvotes: 0

Views: 441

Answers (1)

meda
meda

Reputation: 45490

On your server you can add more logic to send JSON data with that information.

For example:

{
    "success": true,
    "message": "Data received sucessfully"
}

If The request was successful, if not:

{
    "success": false,
    "message": "There is an error"
}

So when you parse that JSON you would check if success is false, and display the error message inside of the message key.

Upvotes: 1

Related Questions