Question

我有以下代码，它应该做什么，是这样的：当相机检测到QR码时，它应该打开我的DetailViewController，通过标识符：SendDataSegue。问题是，当检测到QR码时，没有真正发生的事情？有人能帮我一下吗？我试图使用prepareforsegue代码的底部。

func captureOutput(captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [AnyObject]!, fromConnection connection: AVCaptureConnection!) {
        
        // Check if the metadataObjects array is not nil and it contains at least one object.
        if metadataObjects == nil || metadataObjects.count == 0 {
            qrCodeFrameView?.frame = CGRectZero
            messageLabel.text = "No barcode/QR code is detected"
            return
        }
        
        // Get the metadata object.
        let metadataObj = metadataObjects[0] as! AVMetadataMachineReadableCodeObject
        
        // Here we use filter method to check if the type of metadataObj is supported
        // Instead of hardcoding the AVMetadataObjectTypeQRCode, we check if the type
        // can be found in the array of supported bar codes.
        if supportedBarCodes.contains(metadataObj.type) {
//        if metadataObj.type == AVMetadataObjectTypeQRCode {
            // If the found metadata is equal to the QR code metadata then update the status label's text and set the bounds
            let barCodeObject = videoPreviewLayer?.transformedMetadataObjectForMetadataObject(metadataObj)
            qrCodeFrameView?.frame = barCodeObject!.bounds
            
            if metadataObj.stringValue != nil {
                
                
                func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
                    if (segue.identifier == "SendDataSegue") {
                        // pass data to next view
                    }
                }
                
                
                
                
            }
        }
    }

Answer 1

This piece of code helped me:

dispatch_async(dispatch_get_main_queue()){
                self.performSegueWithIdentifier("SendDataSegue", sender:self)


            }

Does anyone know how to pass data through that? I can pass data through a normal func prepareforsegue, but how do I do it through this?

用qr代码激活prepareforsegue

1 个答案: