Send data to next view controller after QR Code read

Question

I'm hoping i'm missing something pretty simple here, but I can't seem to get my head around it!

I am reading a QR code and pushing to my next view controller once the QR code has been read:

if metadataObj.stringValue != nil {
            let qrData = metadataObj.stringValue

            let segueViewController = self.storyboard?.instantiateViewControllerWithIdentifier("confirmScan") as? ScanConfirm
            self.navigationController?.pushViewController(segueViewController!, animated: true)
            captureSession?.stopRunning() }

I would then like to pass the data found in the QR code and show it in my next view's label. I have tried using prepareForSegue but this doesn't seem to be working.

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    let NextViewController : ScanConfirm = segue.destinationViewController as! ScanConfirm
    NextViewController.newLabel.text = qrData
}

Any help would be HUGELY appreciated!

Thanks

after you get the qrData, you can simply call performSegueWithIdentifier — Teja Nandamuri, Jul 26 '16 at 15:38
Take a look at this answer : http://stackoverflow.com/a/29846611/765298 — Losiowaty, Jul 26 '16 at 15:39
I guess `newLabel` is just not created until you move to your `NextViewController`. — Elena, Jul 26 '16 at 15:40

score 0 · Accepted Answer · answered Jul 26 '16 at 15:52

create a property in ScanConform class

class ScanConform: UIViewController {
var scanData:String?

you can place below code viewdidload or viewwillapper

override func viewDidLoad() {
        super.viewDidLoad()
guard let displayData = scanData else { return }
newLabel.text = displayData
     }
}

While Setting Data Do Like this

if metadataObj.stringValue != nil {
        let qrData = metadataObj.stringValue

        let segueViewController = self.storyboard?.instantiateViewControllerWithIdentifier("confirmScan") as? ScanConfirm
segueViewController.scanData = grData    
        self.navigationController?.pushViewController(segueViewController!, animated: true)
        captureSession?.stopRunning()
 }

Excellent! This worked perfectly. Thank you all very much for your 'swift' responses! — evorg88, Jul 26 '16 at 16:40

Send data to next view controller after QR Code read

1 Answers1