ios - Swift 3 在一行中检测多个条码

Question

您好，我正在使用 swift3 和 AVFoundation 来检测账单的条形码。我的帐单一行最多有 3 个条形码。如何将全部条码合并为一串，并在一行中的所有条码都被检测并合并为一串后才停止运行？

这是我的账单样本

底部有3个条码

这是我的 AVCaptureMetadataOutputObjectsDelegate 函数

func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from connection: AVCaptureConnection!) {
        // This is the delegate'smethod that is called when a code is readed
        for metadata in metadataObjects {
            let readableObject = metadata as! AVMetadataMachineReadableCodeObject
            let code = readableObject.stringValue


            self.dismiss(animated: true, completion: nil)
            self.delegate?.barcodeReaded(barcode: code!)
            print(code!)
            print(readableObject.type)
        }
    }

我们如何修改上面的代码以扫描所有 3 个条形码并将它们组合起来，并在所有条形码都被解码后通知 Viewcontroller？非常感谢任何帮助。谢谢

Answer 1

除非检测到 3 个条码然后组合代码，否则不要停止扫描:

func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from connection: AVCaptureConnection!) {
    // This is the delegate'smethod that is called when a code is headed

    guard metadataObjects.count == 3 else { return }

    var finalString: String = ""

    for metadata in metadataObjects {
        let readableObject = metadata as! AVMetadataMachineReadableCodeObject
        let code = readableObject.stringValue

        finalString.append(code!)
        print(code!)
        print(readableObject.type)
    }

    self.dismiss(animated: true, completion: nil)
    self.delegate?.barcodeReaded(barcode: finalString)
}