Question

我是Ios的新手。我正在学习迅速而被忽视的对象c。

目前，我正在使用swift和xcode 6.1编写演示，可以扫描来自摄像头的qrcode和条形码或来自图像库的图像。

我知道AVFoundation框架支持扫描qrcode和条形码，但它只能从相机扫描。

我搜索并找到zbarSDK，它支持来自摄像头和图像的扫描码。我按照http://zbar.sourceforge.net/iphone/sdkdoc/和NSFastEnumeration in Swift中的说明进行操作（将代码转换为swift）。但是，当我运行app时，从库中选择图像后，就会发生错误。

这是我的代码

import UIKit
    import AVFoundation

    extension ZBarSymbolSet: SequenceType {
        public func generate() -> NSFastGenerator {
            return NSFastGenerator(self)
        }
    }

    class FirstViewController: UIViewController, ZBarReaderDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

        let reader = ZBarReaderController()

        @IBOutlet weak var lblResult: UILabel!
        @IBOutlet weak var imgView: UIImageView!

        override func viewDidLoad() {
            super.viewDidLoad()
            reader.delegate = self
        }

        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()
            // Dispose of any resources that can be recreated.
        }

        @IBAction func scanCode(sender: AnyObject) {
            let scanner = reader.scanner
            scanner.setSymbology(ZBAR_I25, config: ZBAR_CFG_ENABLE, to: 0)
            reader.modalPresentationStyle = .Popover
            presentViewController(reader, animated: true, completion: nil)
        }

        func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
            var results: NSFastEnumeration = info["ZBarReaderControllerResults"] as NSFastEnumeration

            var symbolFound : ZBarSymbol?

            // =============== Error here ==================
            for symbol in results as ZBarSymbolSet {
                symbolFound = symbol as? ZBarSymbol
                break
            }
            var resultString = NSString(string: symbolFound!.data)
            println(resultString)

        }

    }

这里是错误图片 enter image description here

如果有人让我知道它为什么会发生错误以及如何修复它，或者有任何方法使用AVFoundation或其他库（带有详细文档和示例）扫描代码，我将非常感激这样做（请详细说明，因为我刚刚学会了swift和ios 3周）。感谢。

Answer 1

我还想从图像中读取QR码而没有Zbar。

您可以改用CIDetector。我找到了解决方案here。在我的情况下，我从图书馆中选取一张照片（假设是QR码，此处为qrcodeImg），然后在CIImage中将其转换为CIDetector解码。

qrCodeImageView.image=qrcodeImg

let detector:CIDetector=CIDetector(ofType: CIDetectorTypeQRCode, context: nil, options: [CIDetectorAccuracy:CIDetectorAccuracyHigh])
let ciImage:CIImage=CIImage(image:qrcodeImg)
var qrCodeLink=""

let features=detector.featuresInImage(ciImage)
for feature in features as! [CIQRCodeFeature] {
   qrCodeLink += feature.messageString
}

if qrCodeLink=="" {
    print("nothing")
}else{
    print("message: \(qrCodeLink)")
}

Answer 2

对于Swift3，以下代码应该适用于您从ZBarSDK

获取结果

extension ZBarSymbolSet: Sequence {
    public func makeIterator() -> NSFastEnumerationIterator {
        return NSFastEnumerationIterator(self)
    }
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    // ADD: get the decode results
    let results: NSFastEnumeration = info[ZBarReaderControllerResults] as! NSFastEnumeration

    var symbolFound : ZBarSymbol?

    for symbol in results as! ZBarSymbolSet {
        symbolFound = symbol as? ZBarSymbol
        break
    }
    let resultString = symbolFound!.data
    print(resultString)
}

扫描从快照中从图像库中拾取的相机和图像的qrcode和条形码

2 个答案: