Dakata Dakata - 2 years ago 149
Swift Question

How to print error in Swift code?

I have the following code:

func marseJSON(Person: String)

let jsonData1 = NSData(contentsOfURL: NSURL(string: "\(label2)")!) as NSData!

var error : NSError?
let ReadableJSON1 = JSON ( data:jsonData1, options: NSJSONReadingOptions.MutableContainers, error: &error )

// print(error)

LabelText1.text = "There is a problem with the qr code! or simply error"

I have a function which reads a QR code, the problem is that this QR code should be always a link from my server. Would you please show me how can I display an error message into the LabelText1.text if the user does not scan the right QR code for my server.
I have tried by myself but I am new in swift and it seems that the syntax is wrong.

Answer Source

you can try UIAlertController:

   if (error != nil){

   let myAlert = UIAlertController(title: "Alert", message: error?.localizedDescription, preferredStyle: .Alert) //you can change message to whatever you want.
                    let okAction = UIAlertAction(title: "Ok", style: .Default, handler: nil)
   self.presentViewController(myAlert, animated: true, completion: nil)


Hope it helps. :)

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