读取二维码后发送数据到下一个视图控制器

Question

我希望我在这里遗漏了一些非常简单的东西，但我似乎无法理解它！

我正在读取二维码并在读取二维码后推送到我的下一个视图控制器：

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

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

然后我想传递在 QR 码中找到的数据并将其显示在我的下一个视图的标签中。我试过使用 prepareForSegue 但这似乎不起作用。

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

任何帮助将不胜感激！

谢谢

Answer 1

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()
 }

读取二维码后发送数据到下一个视图控制器

Send data to next view controller after QR Code read

iphone

qr-code

ios

swift